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【ASP.NET基础】简单企业产品展示网站--产品编辑CRUD

摘要：本文记录创建一个小的、简单的产品网站的步骤。

一，搭建一个简单的产品展示网站，熟悉以下知识点：NVelocity模板引擎、Ajax无刷新页面请求，文件上传，Row_Number实现分页，ckEditor使用，Bootstrap的简单使用。【点击查看网站效果】

二，网站基本框架：新建项目ProductWeb ，并完成基本框架的搭建（SQLHelper,ckEditor,Common_Nvelocity,Bootstrap等添加到项目中）。并创建ProductWebDB 。【下载基本模板框架】

三，在基本模板的基础上，添加后台产品列表页面（ProductList_Admin.html）

　　A,新增数据库： ProduceWebDB 并新建表ProCategories、Products

USE [ProduceWebDB]
GO
/****** Object:  Table [dbo].[ProCategories]    Script Date: 2015/6/2 15:54:49 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
SET ANSI_PADDING ON
GO
CREATE TABLE [dbo].[ProCategories](
    [CateID] [decimal](18, 0) IDENTITY(1,1) NOT NULL,
    [CateName] [varchar](250) NOT NULL
) ON [PRIMARY]

GO
SET ANSI_PADDING OFF
GO
/****** Object:  Table [dbo].[Products]    Script Date: 2015/6/2 15:54:50 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[Products](
    [ProID] [decimal](18, 0) IDENTITY(1,1) NOT NULL,
    [ProName] [nvarchar](250) NOT NULL,
    [ProImagePath] [nvarchar](max) NOT NULL,
    [ProIntroduce] [text] NOT NULL,
    [ProCateID] [bigint] NOT NULL,
    [AddTime] [datetime] NULL,
    [AddIP] [nchar](18) NULL,
    [IsDelete] [bit] NOT NULL
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]

GO
ALTER TABLE [dbo].[Products] ADD  CONSTRAINT [DF_Products_CreateTime]  DEFAULT (getdate()) FOR [AddTime]
GO
ALTER TABLE [dbo].[Products] ADD  CONSTRAINT [DF_Products_IsDelete]  DEFAULT ((0)) FOR [IsDelete]
GO

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　　B,项目新增ProductList_Admin.ashx一般处理程序，在Templates/Admin下添加对应的 ProductList_Admin.html 页面 ,在后台显示产品列表。

Templates/Admin/Head.html: 相当于模板页的页头部分，用Bootstrap导航组件其他页面通过#parse("Head.html")调用

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta http-equiv="Content-Type" content="text/html;" charset="gb2312" />
    <!-- 这个属性主要是设置浏览器优先使用什么模式来渲染页面的-->
    <!-- #下面的meta标签告诉IE浏览器，IE8/9及以后的版本都会以最高版本IE来渲染页面。  -->
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />


    <!--移动设备都是这Viewport里面打开，width=device-width表示打开页面默认和设备一致，initial-scale=1表示页面不进行缩放   -->
    <meta name="viewport" content="width=device-width, initial-scale=1" />
    <!-- 上述3个meta标签*必须*放在最前面，任何其他内容都*必须*跟随其后！ -->
    <title>后台管理</title>

    <!-- Bootstrap -->
    <!--<link href="css/bootstrap.min.css" rel="stylesheet"/>-->
    <!-- 新 Bootstrap 核心 CSS 文件 -->
    <link rel="stylesheet" href="http://cdn.bootcss.com/bootstrap/3.3.4/css/bootstrap.min.css" />

    <!--低版本浏览器如果支持HTML5需要添加以下js-->
    <!-- HTML5 shim and Respond.js for IE8 support of HTML5 elements and media queries -->
    <!-- WARNING: Respond.js doesn't work if you view the page via file:// -->
    <!--[if lt IE 9]>
      <script src="http://cdn.bootcss.com/html5shiv/3.7.2/html5shiv.min.js"></script>
      <script src="http://cdn.bootcss .com/respond.js/1.4.2/respond.min.js"></script>
    <![endif]-->

    <!--鼠标悬停弹出下拉菜单-->
    <style type="text/css">
        .navbar .nav > li .dropdown-menu {
            margin: 0;
        }

        .navbar .nav > li:hover .dropdown-menu {
            display: block;
        }

        .navbar .nav > li .dropdown-menu > li:hover {
            font-size: larger;
        }
    </style>


</head>
<body>

    <!-- --导航条  默认高度50px, 固定在顶部 -->
    <nav class="navbar navbar-default .navbar-fixed-top">
        <div class="container-fluid">
            <!-- Brand and toggle get grouped for better mobile display -->
            <div class="navbar-header">
                <!--当浏览器宽度变窄的时候会显示这个Button按钮，并且会把data-target中的div中ul收缩导航到Button下方-->
                <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1">
                    <!--定义小按钮的样式-->
                    <span class="sr-only">Toggle navigation</span>
                    <!-- 页面变窄时 ， 按钮的3条横线 -->
                    <span class="icon-bar"></span>
                    <span class="icon-bar"></span>
                    <span class="icon-bar"></span>
                </button>
                <!--Logo位置-->
                <a class="navbar-brand" href="http://www.cnblogs.com/chengzish/">后台管理</a>

            </div>

            <!-- Collect the nav links, forms, and other content for toggling -->
            <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
                <ul class="nav navbar-nav">
                    <!--导航条内容-->
                    <li class="active"><a href="#">首页 <span class="sr-only">(current)</span></a></li>

                    <li><a href="#">成功案例编辑</a></li>
                    <li><a href="#">新闻活动编辑</a></li>
                    <li class="dropdown">
                        <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false">服务编辑<span class="caret"></span></a>
                        <ul class="dropdown-menu" role="menu">
                            <li><a href="#">软件定制编辑</a></li>
                            <li class="divider"></li>
                            <li><a href="#">外包服务编辑</a></li>
                            <li class="divider"></li>
                            <li><a href="#">咨询服务编辑</a></li>
                        </ul>
                    </li>
                    <li class="dropdown">
                        <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false">OA系统解决方案编辑<span class="caret"></span></a>
                        <ul class="dropdown-menu" role="menu">

                            <li><a href="#">员工考勤系统编辑</a></li>
                            <li class="divider"></li>
                            <li><a href="#">薪资结算系统编辑</a></li>
                            <li class="divider"></li>
                            <li><a href="#">门禁管理系统编辑</a></li>
                            <li class="divider"></li>
                            <li><a href="#">APP开发编辑</a></li>

                        </ul>
                    </li>
                </ul>
                <!--搜索表单-->
                <form class="navbar-form navbar-left" role="search">
                    <div class="form-group">
                        <input type="text" class="form-control" placeholder="Search" />
                    </div>
                    <button type="submit" class="btn btn-default">搜索</button>
                </form>
                <ul class="nav navbar-nav navbar-right">
                    <li><a href="#">Git Fork</a></li>
                    <li class="dropdown">
                        <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false">联系我们编辑<span class="caret"></span></a>
                        <ul class="dropdown-menu" role="menu">
                            <li><a href="#">地址</a></li>
                            <li><a href="#">电话</a></li>
                            <li><a href="#">邮箱</a></li>
                            <li class="divider"></li>
                            <li><a href="#">微信</a></li>
                        </ul>
                    </li>
                </ul>
            </div>
            <!-- /.navbar-collapse -->
        </div>
        <!-- /.container-fluid -->
    </nav>

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Templates/Admin/Foot.html: 相当于模板页的页头部分，标注版权信息，其他页面通过#parse("Foot.html")

<div id="footer" class="container">

    <nav class="navbar navbar-default navbar-fixed-bottom">

        <div class="navbar-inner navbar-content-center">

            <p class="text-muted credit" style="padding: 10px; text-align: center">
                Copyright @2014-2015 By 橙子科技 All Rights Reserved.

            </p>

        </div>

    </nav>
</div>

<!-- jQuery (necessary for Bootstrap's JavaScript plugins) -->
<script src="http://cdn.bootcss.com/jquery/1.11.2/jquery.min.js"></script>

<!-- Bootstrap核心js依赖于jQuery,所以要先引用jQuery-->
<!-- Include all compiled plugins (below), or include individual files as needed -->
<!-- <script src="js/bootstrap.min.js"></script>-->

<!-- 最新的 Bootstrap 核心 JavaScript 文件 -->
<script src="http://cdn.bootcss.com/bootstrap/3.3.4/js/bootstrap.min.js"></script>
</body>
</html>

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Templates/Admin/ProductList_Admin.html: 产品列表展示页面，遍历显示产品数据

#parse("Admin/Head.html")
    <h2>产品列表维护</h2>

<div style=" 70%; text-align: center; margin-left: 15%;">
    <table class="table table-striped table-bordered table-hover">
        <tr>
            <td>产品名称</td>
            <td>产品类别</td>
            <td>编辑</td>
            <td>删除</td>
        </tr>
        #foreach($Pro in $data.Products)
            <tr>
                <td>$Pro.ProName</td>
                <td>$Pro.CateName />
                </td>
                <td><a href="ProductEdit.html?action=edit&id=$Pro.ProID">编辑</a></td>
                <td><a href="ProductEdit.html?action=delete&id=$Pro.ProID">删除</a></td>
            </tr>
        #end
    </table>
</div>

#parse("Admin/Foot.html")

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ProductList_Admin.ashx: 从数据库中读取产品信息

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data;

namespace ProductWeb
{
    /// <summary>
    /// ProductList_Admin 后台显示产品列表
    /// </summary>
    public class ProductList_Admin : IHttpHandler
    {

        public void ProcessRequest(HttpContext context)
        {
            context.Response.ContentType = "text/html";
            //从DB中选出产品信息
            string sql = "SELECT [ProID],[ProName],[ProImagePath],[ProIntroduce],b.[CateName] as CateName  FROM [dbo].[Products]  as a left join [dbo].[ProCategories] as b on a.ProCateID=b.CateID ";
            SQLHelper sqlH = new SQLHelper();
            DataTable dt = sqlH.ExecuteQuery(sql, CommandType.Text);


            var data = new { PageTitle = "产品列表", Products = dt.Rows };

            string strHtml = Common_Nvelocity.RenderHTML("Admin/ProductList_Admin.html", data);
            context.Response.Write(strHtml);
        }

        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }
}

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C,Ctrl+F5运行程序，查看 ProductList_Admin.ashx 读出了DB中的数据：

四，添加产品编辑页面（ProductEdit.html）点击ProductList_Admin.html中的“编辑”跳转到ProductEdit.html编辑页面.

　　PorductEdit.ashx根据传递过来的Action(edit,delete,addnew)进行编辑、删除、新增操作。

　　A, 更新webconfig允许写入 html 标签

<system.web>
    <compilation debug="true" targetFramework="4.0" />
    <httpRuntime requestValidationMode="2.0"/>
  </system.web>

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　　B, 添加ProductEdit.html 页面 (1,三个隐藏控件分别记录当前页面是否是首次加载，点击“保存”按钮需要执行的操作，传递过来的id的值 2, 注意下拉列表的实现)

#parse("Admin/Head.html")
    
<script src="../../ckeditor/ckeditor.js"></script>

<div style=" 70%; text-align: left; margin-left: 15%;">
    #if($data.ActionEdit=="edit")
         <h2 class="text-center">产品编辑</h2>
    #elseif ($data.ActionEdit=="delete")
         <h2 class="text-center">产品删除 </h2>
    #elseif ($data.ActionEdit=="addnew")
         <h2 class="text-center">产品新增</h2>
    #end
    <form method="post" action="ProductEdit.ashx">
        <!--三个隐藏，IspostBack 记录页面是否首次加载，action 记录提交按钮后是需要新增还是编辑,txtProIDHiddden 隐藏当前编辑的id  -->
        <input type="hidden" name="IsPostBack" value="true" />
        <input type="hidden" name="txtaction" value="$data.ActionEdit" />
        <input type="hidden" name="txtProIDHiddden" value="$data.Product.ProID" />

        <table class="table table-striped table-bordered">

            <tr>
                <td>产品名称：</td>
                <td>
                    <input type="text" name="txtProName" value="$data.Product.ProName" /></td>
            </tr>

            <tr>
                <td>产品分类：</td>
                <td>
                    <select name="txtProCateID">
                        #foreach($cate in $data.Categories)
                        #if($cate.CateID==$data.Product.ProCateID)
                            <option value="$cate.CateID" selected="selected">$cate.CateName</option>
                        #else
                           <option value="$cate.CateID">$cate.CateName</option>
                        #end
                    #end
                    </select>
                </td>
            </tr>

            <tr>
                <td>产品图片：</td>
                <td>
                    <img id="ProImg" src="$data.Product.ProImagePath" class="img-rounded" /></td>
            </tr>
            <tr>
                <td>产品介绍：</td>
                <td>
                    <textarea id="idProIntroduce" name="txtProIntroduce">$data.Product.ProIntroduce </textarea>
                </td>
            </tr>
            <tr>
                <td colspan="2" style="text-align: center">
                    <input type="submit" value="保存" class="btn btn-primary" />
                    <a href="ProductList_Admin.ashx" class="btn btn-default">返回</a>
                </td>
            </tr>
        </table>


    </form>
    <div style=" 70%; text-align: center; margin-left: 15%;">
        <script type="text/javascript">
            var txtIntro = document.getElementById("idProIntroduce");
            CKEDITOR.replace(txtIntro);

        </script>
#parse("Admin/Foot.html")

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　　C, 添加ProductEdit.ashx 处理新增、编辑、删除操作，并把数据交给Nvelocity模板从而加载到前台页面

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data;
using System.Data.SqlClient;

namespace ProductWeb
{
    /// <summary>
    /// ProductEdit Product编辑页面 
    /// </summary>
    public class ProductEdit : IHttpHandler
    {

        public void ProcessRequest(HttpContext context)
        {
            context.Response.ContentType = "text/html";
            string strHtml = "";
            string sqlCates = "SELECT [CateID],[CateName] FROM [dbo].[ProCategories]";
            SQLHelper sqlH = new SQLHelper();
            DataTable dtCates = sqlH.ExecuteQuery(sqlCates, CommandType.Text);

            //[ProID],[ProName],[ProImagePath],[ProIntroduce],[ProCateID],b.[CateName] as CateName,b.[CateID] as CateID  FROM [Products]  as a left join [ProCategories] as b on a.ProCateID=b.CateID and a.ProID=@strProID ";     //
            ////定义Product,并给一个默认的控制 
            var ProductOriginal = new { ProID = 0, ProName = "", ProImagePath = "", ProIntroduce = "", CateName = "", CateID = "" };


            //页面首次加载 , 显示Product信息
            if (string.IsNullOrEmpty(context.Request.Form["IsPostBack"]) == true)
            {
                string strProID = context.Request.QueryString["id"];   // 点击 编辑 按钮，传递过来 action 和 id值
                string strAction = context.Request.QueryString["action"] == null ? "" : context.Request.QueryString["action"].ToString().ToLower(); //  点击保存后，具体是 edit、 delte还是 add，  保存在页面的隐藏控件中
                string strPageTitle = "产品操作";  //default

                if (!string.IsNullOrEmpty(strProID))   // id 存在
                {
                    //从DB中选出 id 对应的Product 信息
                    SqlParameter[] sqlParas = new SqlParameter[] { 
                        new SqlParameter("@strProID",strProID)
                    };

                    if (strAction == "edit")
                    {
                        strPageTitle = "产品编辑";
                    }
                    else if (strAction == "delete")
                    {
                        strPageTitle = "产品删除";
                    }
                    else if (strAction == "addnew")
                    {
                        strPageTitle = "产品新增";
                    }
                    //选择出ID对应的Product
                    DataTable dtPro = dtGetProductByID(strProID);
                    int numExist = 0;
                    numExist = dtPro.Rows.Count;

                    if (numExist > 0)
                    {
                        // 产品存在,显示产品信息
                        var data = new { PageTitle = strPageTitle, Categories = dtCates.Rows, Product = dtPro.Rows[0], ActionEdit = strAction };
                        strHtml = Common_Nvelocity.RenderHTML("Admin/ProductEdit.html", data);
                    }
                    else
                    {
                        // 不存在,显示编辑页面
                        var data = new { PageTitle = strPageTitle, Categories = dtCates.Rows, Product = ProductOriginal, ActionEdit = strAction };
                        strHtml = Common_Nvelocity.RenderHTML("Admin/ProductEdit.html", data);
                    }
                }
                else
                {
                    //显示编辑页面
                    var data = new { PageTitle = strPageTitle, Categories = dtCates.Rows, Product = ProductOriginal, ActionEdit = strAction };
                    strHtml = Common_Nvelocity.RenderHTML("Admin/ProductEdit.html", data);
                }

            }
            //点击了 submit 按钮，根据传递过来的action进行操作 update/delete
            else
            {
                string strAction = context.Request.Form["txtaction"];
                if (!string.IsNullOrEmpty(strAction))
                {
                    string strInfo = "";
                    if (strAction == "edit")
                    {

                        string strProID = context.Request.Form["txtProIDHiddden"];
                        string strProName = context.Request.Form["txtProName"];
                        string strProCateID = context.Request.Form["txtProCateID"];
                        //string strProImagePath = context.Request.Form["strProImgPath"];
                        string strProIntroduce = context.Request.Form["txtProIntroduce"];


                        //选择出ID对应的Product
                        DataTable dtPro = dtGetProductByID(strProID);
                        int numExist = 0;
                        numExist = dtPro.Rows.Count;
                        if (numExist > 0)
                        {
                            //update
                            string sqlUpdate = "update [Products] set [ProName]=@ProName,[ProIntroduce]=@ProIntroduce,[ProCateID]=@ProCateID where [IsDelete]=0 and [ProID]=@ProID ";
                            SqlParameter[] sqlParas = new SqlParameter[] { 
                                new SqlParameter("@ProName",strProName),
                                new SqlParameter("@ProCateID",strProCateID),
                                new SqlParameter("@ProIntroduce",strProIntroduce),
                                new SqlParameter("@ProID",strProID)
                            };
                            int numSuccUpd = 0;
                            numSuccUpd = sqlH.ExecuteNonQuery(sqlUpdate, sqlParas, CommandType.Text);

                            if (numSuccUpd > 0)
                            {
                                strInfo = "更新成功";
                                DataTable dtProNew = dtGetProductByID(strProID);
                                var data = new { PageTitle = "产品编辑", Categories = dtCates.Rows, Product = dtProNew.Rows[0], ActionEdit = strAction, InfoMeg = strInfo };
                                strHtml = Common_Nvelocity.RenderHTML("Admin/ProductEdit.html", data);
                            }
                            else
                            {
                                strInfo = "更新失败";
                                DataTable dtProNew = dtGetProductByID(strProID);
                                var data = new { PageTitle = "产品编辑", Categories = dtCates.Rows, Product = dtProNew.Rows[0], ActionEdit = strAction, InfoMeg = strInfo };
                                strHtml = Common_Nvelocity.RenderHTML("Admin/ProductEdit.html", data);
                            }
                        }
                    }
                    else if (strAction == "delete")
                    {
                        string strProID = context.Request.Form["txtProIDHiddden"];
                        //选择出ID对应的Product
                        DataTable dtPro = dtGetProductByID(strProID);
                        int numExist = 0;
                        numExist = dtPro.Rows.Count;
                        if (numExist > 0)
                        {
                            string sqlUpdate = "update [Products] set [IsDelete]=1  where  [ProID]=@ProID ";
                            SqlParameter[] sqlParas = new SqlParameter[] { 
                                new SqlParameter("@ProID",strProID)
                            };
                            int numSuccUpd = 0;
                            numSuccUpd = sqlH.ExecuteNonQuery(sqlUpdate, sqlParas, CommandType.Text);
                            if (numSuccUpd > 0)
                            {
                                strInfo = "删除成功";
                                context.Response.Redirect("productlist_admin.ashx");
                            }
                            else
                            {
                                DataTable dtProNew = dtGetProductByID(strProID);
                                var data = new { PageTitle = "产品删除", Categories = dtCates.Rows, Product = dtProNew.Rows[0], ActionEdit = strAction, InfoMeg = strInfo };
                                strHtml = Common_Nvelocity.RenderHTML("Admin/ProductEdit.html", data);
                            }
                        }

                    }
                    else if (strAction == "addnew")
                    {
                        //写入数据库

                        string strProName = context.Request.Form["txtProName"];
                        string strProCateID = context.Request.Form["txtProCateID"];
                        string strProImagePath = "updloadFiles/3.jpg";
                        string strProIntroduce = context.Request.Form["txtProIntroduce"];
                        if (string.IsNullOrEmpty(strProName) || string.IsNullOrEmpty(strProCateID) || string.IsNullOrEmpty(strProIntroduce))
                        {
                            strInfo = "不允许为空";
                            var data = new { PageTitle = "产品新增", Categories = dtCates.Rows, Product = ProductOriginal, MesgInfo = strInfo };
                            strHtml = Common_Nvelocity.RenderHTML("Admin/ProductEdit.html", data);
                        }
                        else
                        {
                            string sqlInsert = "  insert into [Products]([ProName],[ProCateID],[ProIntroduce],[ProImagePath]) values(@ProName,@ProCateID,@ProIntroduce,@ProImagePath) ";
                            SqlParameter[] sqlParas = new SqlParameter[] { 
                                new SqlParameter("@ProName",strProName),
                                new SqlParameter("@ProCateID",strProCateID),
                                new SqlParameter("@ProIntroduce",strProIntroduce),
                                 new SqlParameter("@ProImagePath",strProImagePath)
                            };
                            int numSucc = sqlH.ExecuteNonQuery(sqlInsert, sqlParas, CommandType.Text);
                            if (numSucc == 1)
                            {
                                strInfo = "添加成功";
                                context.Response.Redirect("productlist_admin.ashx");
                            }
                            else
                            {
                                strInfo = "添加失败";
                                var data = new { PageTitle = "产品新增", Categories = dtCates.Rows, Product = ProductOriginal, MesgInfo = strInfo };
                                strHtml = Common_Nvelocity.RenderHTML("Admin/ProductEdit.html", data);
                            }
                        }

                    }
                }
                else
                {
                    var data = new { PageTitle = "产品编辑", Categories = dtCates.Rows, Product = ProductOriginal, MesgInfo = "" };
                    strHtml = Common_Nvelocity.RenderHTML("Admin/ProductEdit.html", data);
                }

            }
            context.Response.Write(strHtml);
        }

        public DataTable dtGetProductByID(string strProID)
        {
            SQLHelper sqlH = new SQLHelper();
            //选择出ID对应的Product
            string sqlPro = "SELECT [ProID],[ProName],[ProImagePath],[ProIntroduce],[ProCateID],b.[CateName] as CateName,b.[CateID] as CateID  FROM [Products]  as a left join [ProCategories] as b on a.ProCateID=b.CateID where [IsDelete]=0 and a.ProID=@ProID ";
            SqlParameter[] sqlParas = new SqlParameter[] { 
                                     new SqlParameter("@ProID", strProID)
                                };

            DataTable dtPro = sqlH.ExecuteQuery(sqlPro, sqlParas, CommandType.Text);
            return dtPro;
        }

        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }
}

View Code

---------------------------------------------------实现效果：新增 AddNew---------------------------------------------------

----------------------------------------------------实现效果：编辑 Edit-------------------------------------------------------

----------------------------------------------------实现效果：删除 Delete-----------------------------------------------------

五，实现图片上传和分页（知识点：1，From表单设置enctype属性 2，文件上传并SaveAs到Server.MapPath 3，Row_Number()进行分页）

　　A，分别更新ProductEdit.html和ProductEdit.ashx 实现图片的上传和更新（图片存储在服务器，图片名称存储DB）

Templates/Admin/ProductEdit.html: Form表单添加enctype="multipart/form-data"属性，图片src读取图片路径

#parse("Admin/Head.html")
    
<script src="../../ckeditor/ckeditor.js"></script>

<div style=" 70%; text-align: left; margin-left: 15%;">
    #if($data.ActionEdit=="edit")
         <h2 class="text-center">产品编辑</h2>
    #elseif ($data.ActionEdit=="delete")
         <h2 class="text-center">产品删除 </h2>
    #elseif ($data.ActionEdit=="addnew")
         <h2 class="text-center">产品新增</h2>
    #end
    <form method="post" action="ProductEdit.ashx" enctype="multipart/form-data">
        <!--三个隐藏，IspostBack 记录页面是否首次加载，action 记录提交按钮后是需要新增还是编辑,txtProIDHiddden 隐藏当前编辑的id  -->
        <input type="hidden" name="IsPostBack" value="true" />
        <input type="hidden" name="txtaction" value="$data.ActionEdit" />
        <input type="hidden" name="txtProIDHiddden" value="$data.Product.ProID" />

        <table class="table table-striped table-bordered">

            <tr>
                <td>产品名称：</td>
                <td>
                    <input type="text" name="txtProName" value="$data.Product.ProName" /></td>
            </tr>

            <tr>
                <td>产品分类：</td>
                <td>
                    <select name="txtProCateID">
                        #foreach($cate in $data.Categories)
                        #if($cate.CateID==$data.Product.ProCateID)
                            <option value="$cate.CateID" selected="selected">$cate.CateName</option>
                        #else
                           <option value="$cate.CateID">$cate.CateName</option>
                        #end
                    #end
                    </select>
                </td>
            </tr>

            <tr>
                <td>产品图片：</td>
                <td>#if ($data.ActionEdit=="addnew")
                    <input type="file" name="ProductImage" value="上传图片" />
                    #else
                    <img id="ProImg" src="../../uploadFiels/$data.Product.ProImagePath" class="img-rounded" style=" 40px; height: 40px" />
                    <input type="file" name="ProductImage" value="更新图片" />
                    #end

                </td>
            </tr>
            <tr>
                <td>产品介绍：</td>
                <td>
                    <textarea id="idProIntroduce" name="txtProIntroduce">$data.Product.ProIntroduce </textarea>
                </td>
            </tr>
            <tr>
                <td colspan="2" style="text-align: center">
                    <input type="submit" value="保存" class="btn btn-primary" />
                    <a href="ProductList_Admin.ashx" class="btn btn-default">返回</a>
                </td>
            </tr>
        </table>
    </form>

    <br />
    <br />
    <br />
    <script type="text/javascript">
        var txtIntro = document.getElementById("idProIntroduce");
        CKEDITOR.replace(txtIntro);
    </script>
#parse("Admin/Foot.html")

View Code

ProductEdit.ashx: 实现图片保存到uploadfiles文件夹，图片名称保存到DB

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data;
using System.Data.SqlClient;
using System.IO;

namespace ProductWeb
{
    /// <summary>
    /// ProductEdit Product编辑页面 
    /// </summary>
    public class ProductEdit : IHttpHandler
    {

        public void ProcessRequest(HttpContext context)
        {
            context.Response.ContentType = "text/html";
            string strHtml = "";
            string sqlCates = "SELECT [CateID],[CateName] FROM [dbo].[ProCategories]";
            SQLHelper sqlH = new SQLHelper();
            DataTable dtCates = sqlH.ExecuteQuery(sqlCates, CommandType.Text);

            //[ProID],[ProName],[ProImagePath],[ProIntroduce],[ProCateID],b.[CateName] as CateName,b.[CateID] as CateID  FROM [Products]  as a left join [ProCategories] as b on a.ProCateID=b.CateID and a.ProID=@strProID ";     //
            ////定义Product,并给一个默认的控制 
            var ProductOriginal = new { ProID = 0, ProName = "", ProImagePath = "", ProIntroduce = "", CateName = "", CateID = "" };


            //页面首次加载 , 显示Product信息
            if (string.IsNullOrEmpty(context.Request.Form["IsPostBack"]) == true)
            {
                string strProID = context.Request.QueryString["id"];   // 点击 编辑 按钮，传递过来 action 和 id值
                string strAction = context.Request.QueryString["action"] == null ? "" : context.Request.QueryString["action"].ToString().ToLower(); //  点击保存后，具体是 edit、 delte还是 add，  保存在页面的隐藏控件中
                string strPageTitle = "产品操作";  //default

                if (!string.IsNullOrEmpty(strProID))   // id 存在
                {
                    //从DB中选出 id 对应的Product 信息
                    SqlParameter[] sqlParas = new SqlParameter[] { 
                        new SqlParameter("@strProID",strProID)
                    };

                    if (strAction == "edit")
                    {
                        strPageTitle = "产品编辑";
                    }
                    else if (strAction == "delete")
                    {
                        strPageTitle = "产品删除";
                    }
                    else if (strAction == "addnew")
                    {
                        strPageTitle = "产品新增";
                    }
                    //选择出ID对应的Product
                    DataTable dtPro = dtGetProductByID(strProID);
                    int numExist = 0;
                    numExist = dtPro.Rows.Count;

                    if (numExist > 0)
                    {
                        // 产品存在,显示产品信息
                        var data = new { PageTitle = strPageTitle, Categories = dtCates.Rows, Product = dtPro.Rows[0], ActionEdit = strAction };
                        strHtml = Common_Nvelocity.RenderHTML("Admin/ProductEdit.html", data);
                    }
                    else
                    {
                        // 不存在,显示编辑页面
                        var data = new { PageTitle = strPageTitle, Categories = dtCates.Rows, Product = ProductOriginal, ActionEdit = strAction };
                        strHtml = Common_Nvelocity.RenderHTML("Admin/ProductEdit.html", data);
                    }
                }
                else
                {
                    //显示编辑页面
                    var data = new { PageTitle = strPageTitle, Categories = dtCates.Rows, Product = ProductOriginal, ActionEdit = strAction };
                    strHtml = Common_Nvelocity.RenderHTML("Admin/ProductEdit.html", data);
                }

            }
            //点击了 submit 按钮，根据传递过来的action进行操作 update/delete
            else
            {
                string strAction = context.Request.Form["txtaction"];
                if (!string.IsNullOrEmpty(strAction))
                {
                    string strInfo = "";
                    if (strAction == "edit")
                    {

                        string strProID = context.Request.Form["txtProIDHiddden"];
                        string strProName = context.Request.Form["txtProName"];
                        string strProCateID = context.Request.Form["txtProCateID"];
                        string strProImageName = ""; //文件名
                        string strProIntroduce = context.Request.Form["txtProIntroduce"];


                        //选择出ID对应的Product
                        DataTable dtPro = dtGetProductByID(strProID);
                        int numExist = 0;
                        numExist = dtPro.Rows.Count;
                        if (numExist > 0)
                        {

                            //上传文件
                            HttpPostedFile proImg = context.Request.Files["ProductImage"];  //获得客户端上传图片信息
                            string imgServerPath = context.Server.MapPath("~/uploadFiels/"); //项目中 uploadFiles路径
                            string strTimeNow = DateTime.Now.ToString("yyyyMMddHHmmssfff");
                            strProImageName = strTimeNow + Path.GetExtension(proImg.FileName);
                            if ((Path.GetExtension(proImg.FileName) == ".jpg" || Path.GetExtension(proImg.FileName) == ".png") && proImg.ContentLength < 102400)
                            {
                                proImg.SaveAs(imgServerPath + strProImageName);       //上传
                            }
                            //update DB
                            string sqlUpdate = "update [Products] set [ProName]=@ProName,[ProIntroduce]=@ProIntroduce,[ProCateID]=@ProCateID,[ProImagePath]=@ProImagePath where [IsDelete]=0 and [ProID]=@ProID ";
                            SqlParameter[] sqlParas = new SqlParameter[] { 
                                new SqlParameter("@ProName",strProName),
                                new SqlParameter("@ProCateID",strProCateID),
                                new SqlParameter("@ProIntroduce",strProIntroduce),
                                new SqlParameter("@ProID",strProID),
                                new SqlParameter("@ProImagePath",strProImageName)
                            };
                            int numSuccUpd = 0;
                            numSuccUpd = sqlH.ExecuteNonQuery(sqlUpdate, sqlParas, CommandType.Text);

                            if (numSuccUpd > 0)
                            {
                                strInfo = "更新成功";
                                DataTable dtProNew = dtGetProductByID(strProID);
                                var data = new { PageTitle = "产品编辑", Categories = dtCates.Rows, Product = dtProNew.Rows[0], ActionEdit = strAction, InfoMeg = strInfo };
                                strHtml = Common_Nvelocity.RenderHTML("Admin/ProductEdit.html", data);
                            }
                            else
                            {
                                strInfo = "更新失败";
                                DataTable dtProNew = dtGetProductByID(strProID);
                                var data = new { PageTitle = "产品编辑", Categories = dtCates.Rows, Product = dtProNew.Rows[0], ActionEdit = strAction, InfoMeg = strInfo };
                                strHtml = Common_Nvelocity.RenderHTML("Admin/ProductEdit.html", data);
                            }
                        }
                    }
                    else if (strAction == "delete")
                    {
                        string strProID = context.Request.Form["txtProIDHiddden"];
                        //选择出ID对应的Product
                        DataTable dtPro = dtGetProductByID(strProID);
                        int numExist = 0;
                        numExist = dtPro.Rows.Count;
                        if (numExist > 0)
                        {
                            string sqlUpdate = "update [Products] set [IsDelete]=1  where  [ProID]=@ProID ";
                            SqlParameter[] sqlParas = new SqlParameter[] { 
                                new SqlParameter("@ProID",strProID)
                            };
                            int numSuccUpd = 0;
                            numSuccUpd = sqlH.ExecuteNonQuery(sqlUpdate, sqlParas, CommandType.Text);
                            if (numSuccUpd > 0)
                            {
                                strInfo = "删除成功";
                                context.Response.Redirect("productlist_admin.ashx");
                            }
                            else
                            {
                                DataTable dtProNew = dtGetProductByID(strProID);
                                var data = new { PageTitle = "产品删除", Categories = dtCates.Rows, Product = dtProNew.Rows[0], ActionEdit = strAction, InfoMeg = strInfo };
                                strHtml = Common_Nvelocity.RenderHTML("Admin/ProductEdit.html", data);
                            }
                        }

                    }
                    else if (strAction == "addnew")
                    {
                        //写入数据库

                        string strProName = context.Request.Form["txtProName"];
                        string strProCateID = context.Request.Form["txtProCateID"];
                        string strProImageName = "";
                        string strProIntroduce = context.Request.Form["txtProIntroduce"];


                        if (string.IsNullOrEmpty(strProName) || string.IsNullOrEmpty(strProCateID) || string.IsNullOrEmpty(strProIntroduce))
                        {
                            strInfo = "不允许为空";
                            var data = new { PageTitle = "产品新增", Categories = dtCates.Rows, Product = ProductOriginal, MesgInfo = strInfo };
                            strHtml = Common_Nvelocity.RenderHTML("Admin/ProductEdit.html", data);
                        }
                        else
                        {
                            //上传文件
                            HttpPostedFile proImg = context.Request.Files["ProductImage"];  //获得客户端上传图片信息
                            string imgServerPath = context.Server.MapPath("~/uploadFiels/"); //项目中 uploadFiles路径
                            string strTimeNow = DateTime.Now.ToString("yyyyMMddHHmmssfff");
                            strProImageName = strTimeNow + Path.GetExtension(proImg.FileName);
                            if ((Path.GetExtension(proImg.FileName) == ".jpg" || Path.GetExtension(proImg.FileName) == ".png") && proImg.ContentLength < 102400)
                            {
                                proImg.SaveAs(imgServerPath + strProImageName);       //上传
                            }
                            // Insert DB
                            string sqlInsert = "  insert into [Products]([ProName],[ProCateID],[ProIntroduce],[ProImagePath]) values(@ProName,@ProCateID,@ProIntroduce,@ProImagePath) ";
                            SqlParameter[] sqlParas = new SqlParameter[] { 
                                new SqlParameter("@ProName",strProName),
                                new SqlParameter("@ProCateID",strProCateID),
                                new SqlParameter("@ProIntroduce",strProIntroduce),
                                new SqlParameter("@ProImagePath",strProImageName)
                            };
                            int numSucc = sqlH.ExecuteNonQuery(sqlInsert, sqlParas, CommandType.Text);
                            if (numSucc == 1)
                            {
                                strInfo = "添加成功";
                                context.Response.Redirect("productlist_admin.ashx");
                            }
                            else
                            {
                                strInfo = "添加失败";
                                var data = new { PageTitle = "产品新增", Categories = dtCates.Rows, Product = ProductOriginal, MesgInfo = strInfo };
                                strHtml = Common_Nvelocity.RenderHTML("Admin/ProductEdit.html", data);
                            }
                        }

                    }
                }
                else
                {
                    var data = new { PageTitle = "产品编辑", Categories = dtCates.Rows, Product = ProductOriginal, MesgInfo = "" };
                    strHtml = Common_Nvelocity.RenderHTML("Admin/ProductEdit.html", data);
                }

            }
            context.Response.Write(strHtml);
        }
        // Query Product By ID
        public DataTable dtGetProductByID(string strProID)
        {
            SQLHelper sqlH = new SQLHelper();
            //选择出ID对应的Product
            string sqlPro = "SELECT [ProID],[ProName],[ProImagePath],[ProIntroduce],[ProCateID],b.[CateName] as CateName,b.[CateID] as CateID  FROM [Products]  as a left join [ProCategories] as b on a.ProCateID=b.CateID where [IsDelete]=0 and a.ProID=@ProID ";
            SqlParameter[] sqlParas = new SqlParameter[] { 
                                     new SqlParameter("@ProID", strProID)
                                };

            DataTable dtPro = sqlH.ExecuteQuery(sqlPro, sqlParas, CommandType.Text);
            return dtPro;
        }


        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }
}

View Code

--------------------------图片上传-效果--------------------------------------------

　　B，借助SQL的Row_Number方法进行分页，前台页面传入页码到后台，然后查询对应页码的数据。（1，Row_Number 2，页码计算 3，根据当前页面把上一页、下一页禁用）

　　　　分别更新ProductList_Admin.html 和 ProductList_Admin.ashx页面：

Templates/Admin/ProductList_Admin.html 调用Bootstrap分页组件

#parse("Admin/Head.html")


<h2 class="text-center">产品列表维护</h2>

<div style=" 70%; text-align: center; margin-left: 15%;">
    <table class="table table-striped table-bordered table-hover">
        <tr style="font-weight: bolder">

            <td>产品名称</td>
            <td>产品类别</td>
            <td>编辑</td>
            <td>删除</td>
        </tr>
        #foreach($Pro in $data.Products)
            <tr>
                <td>$Pro.ProName</td>
                <td>$Pro.CateName</td>

                <td><a href="ProductEdit.ashx?action=edit&id=$Pro.ProID">编辑</a></td>
                <td><a href="ProductEdit.ashx?action=delete&id=$Pro.ProID">删除</a></td>

            </tr>
        #end
        <tr>
            <td colspan="4" class="text-center">
                <nav>
                    <ul class="pagination">
                        #if($data.PageBeforeNext.PageBefore==0)
                        <li class="disabled">
                        #else 
                        <li>#end
                            <a href="Productlist_admin.ashx?Page=$data.PageBeforeNext.PageBefore" aria-label="Previous">
                                <span aria-hidden="true">&laquo;</span>
                            </a>
                        </li>

                        #foreach($pageHref in $data.PageData)
                          <li><a href="$pageHref.Href">$pageHref.Title</a></li>
                        #end


                        #if($data.PageBeforeNext.PageNext>=$data.PageNums)
                        <li class="disabled">
                        #else 
                        <li>#end
                            <a href="Productlist_admin.ashx?Page=$data.PageBeforeNext.PageNext" aria-label="Next">
                                <span aria-hidden="true">&raquo;</span>
                            </a>
                        </li>
                        <li><a>共$data.PageNums页</a></li>
                    </ul>
                </nav>
            </td>
        </tr>
        <tr>
            <td colspan="4" class="text-center">
                <a href="ProductEdit.ashx?action=AddNew" class="btn btn-default">新增</a></td>
        </tr>
    </table>
</div>

#parse("Admin/Foot.html")

View Code

ProductList_Admin.ashx： 1,页数计算，理解Row_Number分页 2，生成对应的href链接传递给前台页面 3，当前页码、页面总数、上页、下页

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data;
using System.Data.SqlClient;


namespace ProductWeb
{
    /// <summary>
    /// ProductList_Admin 后台显示产品列表
    /// </summary>
    public class ProductList_Admin : IHttpHandler
    {
        public void ProcessRequest(HttpContext context)
        {
            context.Response.ContentType = "text/html";


            //从DB中选出产品信息
            SQLHelper sqlH = new SQLHelper();
            //DataTable是把数据读取出来以后放入内存中，如果数据量大的话 一次性都读出来的话就很吃内存造成系统性能很差
            //这时候我们就要从DB中只读取我们需要的数据就好了 ， 把数据进行分页处理，只读取需要页数的数据

            // 一，页数计算。查询出来Product总数numAllProducts. 总页数numPages=Celling(numAllProducts/10.0) .  天花板函数的结果是  >=这个数的最小整数
            int numAllProducts = Convert.ToInt32(sqlH.ExecuteScalar("select count(*) from [Products] where [IsDelete]=0", CommandType.Text));
            int numPages = (int)Math.Ceiling(numAllProducts / 10.0);  // 5/10→1  10/10→1   11/10→2

            //二，生成前台页面 a 的链接地址 href
            object[] objPageData = new object[numPages];
            for (int i = 0; i < numPages; i++)
            {
                objPageData[i] = new { Href = "ProductList_Admin.ashx?Page=" + (i + 1).ToString(), Title = (i + 1).ToString() };
            }

            //三，根据前台传递过来的页码，查询对应页面的数据
            int intRowNumber = 1; //默认为第1页 1-10条数据，第2页： 11~20条数据  （intRowNumber-1）*10+1~intRowNumber*10
            string strPageNumber = context.Request.QueryString["Page"];
            if (!string.IsNullOrEmpty(strPageNumber))
            {
                intRowNumber = Convert.ToInt32(strPageNumber);  //获取传递过来的页面
            }

            //选择对应页面的数据
            string sql = @"select * from 
                           (SELECT [ProID],[ProName],[ProImagePath],[ProIntroduce],[ProCateID],b.[CateName] as CateName,b.[CateID] as CateID,ROW_NUMBER() over (order by ProID) as RowNum  
                             FROM [Products]  as a left join [ProCategories] as b on a.ProCateID=b.CateID where [IsDelete]=0 ) as s
                             where s.RowNum between (@IntRowNumber-1)*10+1 and @IntRowNumber*10    ";

            SqlParameter[] sqlParas = new SqlParameter[] { 
                new SqlParameter("@IntRowNumber",intRowNumber)
            };
            //string sql = "SELECT [ProID],[ProName],[ProImagePath],[ProIntroduce],b.[CateName] as CateName  FROM [dbo].[Products]  as a left join [dbo].[ProCategories] as b on a.ProCateID=b.CateID where [IsDelete]=0 ";
            DataTable dt = sqlH.ExecuteQuery(sql, sqlParas, CommandType.Text);

            //四，根据当天页码和总页面数，设置前一页和后一页
            var varPageBeforeNext = new { PageBefore = intRowNumber - 1, PageNext = intRowNumber + 1 };

            var data = new { PageTitle = "产品列表", Products = dt.Rows, PageData = objPageData, PageNums = numPages, PageBeforeNext = varPageBeforeNext };

            string strHtml = Common_Nvelocity.RenderHTML("Admin/ProductList_Admin.html", data);
            context.Response.Write(strHtml);
        }

        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }
}

View Code

--------------------------------------------------分页实现效果------------------------------------------------------

总结：本文实现了产品编辑的增删查改功能，了解图片上传、分页实现等。　　【Demo下载】

参考：

NVelocity 语法： http://www.cnblogs.com/hxling/archive/2011/10/23/2221918.html

Row_Number()使用： http://www.cnblogs.com/gy51Testing/archive/2012/07/26/2609832.html

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原文地址：https://www.cnblogs.com/chengzish/p/4529148.html

【ASP.NET基础】简单企业产品展示网站--产品编辑CRUD

一，搭建一个简单的产品展示网站，熟悉以下知识点：NVelocity模板引擎、Ajax无刷新页面请求，文件上传，Row_Number实现分页，ckEditor使用，Bootstrap的简单使用。【点击查看网站效果】

二，网站基本框架：新建项目ProductWeb ，并完成基本框架的搭建（SQLHelper,ckEditor,Common_Nvelocity,Bootstrap等添加到项目中）。并创建ProductWebDB 。【下载基本模板框架】

三，在基本模板的基础上，添加后台 产品列表页面（ProductList_Admin.html）

四，添加产品编辑页面（ProductEdit.html）点击ProductList_Admin.html中的“编辑”跳转到ProductEdit.html编辑页面.

五，实现图片上传和分页 （知识点：1，From表单设置enctype属性 2，文件上传并SaveAs到Server.MapPath 3，Row_Number()进行分页）

三，在基本模板的基础上，添加后台产品列表页面（ProductList_Admin.html）

五，实现图片上传和分页（知识点：1，From表单设置enctype属性 2，文件上传并SaveAs到Server.MapPath 3，Row_Number()进行分页）