MVC简单实例

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;
using System.Web;
using System.Web.Mvc;
using WebApplication1.Models;

namespace WebApplication1.Controllers
{
    public class LeaveMsgController:Controller
    {
        //GET:/LeaveMsg/
        public ActionResult Index()
        {
            //Controllers向视图传值
            //原理：先存数据然后再在视图你面取出来
            string s = "hello!!";
            ViewData["aa"] = s;
            
            BBSDataContext bbs = new BBSDataContext();
            List<student> v = (from m in bbs.student
                    select m).ToList();
            ViewData["list"] = v;

            return View();
        }
        //删除
        public ActionResult Delete()
        {
            //RouterData 可以获取路由上的数据
            string id = RouteData.Values["id"].ToString();
            //可以将一段文字返回给浏览器
            //return view() 是把当前这个Action对应的视图返回给浏览器
            BBSDataContext dc = new BBSDataContext();
            var v = from d in dc.student
                    where d.stuID == int.Parse(id)
                    select d;
            if (v.Count()>0)
            {
                //删除
                try
                {
                    dc.student.DeleteOnSubmit(v.First());
                    dc.SubmitChanges();
                    //成功
                    //TempData临时数据，为下一次请求服务，在下一次请求完毕，数据清除
                    //本质是session存放数据
                    TempData["msg"] = "删除成功";
                }
                catch (Exception)
                {
                    //失败
                    TempData["msg"] = "删除失败!!!";
                }
               
            }
            else
            {
                //没有对应的数据
                TempData["msg"] = "没有找到对应的数据!!!";
            }
            return RedirectToAction("Index");
        }

        //新增
        public ActionResult Insert()
        {
            return View();

        }

        //数据验证
        public void CheckData(student s)
        {
            //用户名不能为空
            if (s.stuName=="")
            {
                ModelState.AddModelError("stuName", "用户名不能为空");
            }
            //性别内容长度不能为空且不能大于2个字符
            if (s.stuNo==""&&s.stuNo.Length<2)
            {
                ModelState.AddModelError("stuName", "用户名不能为空或字符数大于2");
            }
            //正则表达式
            //bool b= Regex.IsMatch(s.stuID.ToString(), "^\{6}$");//C#正则
           
        }
        //提交新增操作
        public ActionResult InsertOK()
        {
            //数据验证
           
            BBSDataContext dc = new BBSDataContext();
            student s = new student();
            s.stuName = Request["stuName"];
            s.stuID = int.Parse(Request["stuNo"]);
            s.sex = Request["sex"];
            s.remark = Request["remark"];
            CheckData(s);
            if (!ModelState.IsValid)//验证不通过
            {
                ViewData["stuName"] = s.stuName;
                ViewData["stuNo"] = s.stuNo;
                ViewData["sex"] = s.sex;
                return View("Insert");
            }
            try
            {
                dc.student.InsertOnSubmit(s);
                dc.SubmitChanges();
                TempData["msg"] = "新增成功!!!";
                return RedirectToAction("Index");
            }
            catch (Exception)
            {
                TempData["msg"] = "新增失败";
                return RedirectToAction("Insert");
            }
        }

        //编辑跳转
        public ActionResult Edit()
        {

            string id = RouteData.Values["id"].ToString();
            ViewData["id"] = id;
            //找id对应的数据
            BBSDataContext dc = new BBSDataContext();
            var v = from d in dc.student
                    where d.stuID == int.Parse(id)
                    select d;
            if (v.Count()>0)
            {
                var d = v.First();
                ViewData["stuName"] = d.stuName;
                ViewData["stuNo"] = d.stuNo;
                ViewData["sex"] = d.sex;
                ViewData["remark"] = d.remark;
                return View();
            }
            else
            {
                TempData["msg"] = "没有对应的数据";
                return View();
            }
        }

        //修改
        public ActionResult Update()
        {
            string id = Request["id"];
            BBSDataContext dc = new BBSDataContext();
            var v = from d in dc.student
                    where d.stuID == int.Parse(id)
                    select d;
            if (v.Count()>0)
            {
                var m = v.First();
                m.stuName = Request["stuName"];
                m.stuNo = Request["stuNo"];
                m.sex = Request["sex"];
                CheckData(m);
                if (!ModelState.IsValid)
                {
                    return View("Edit");
                }
                try
                {
                    dc.SubmitChanges();//提交修改
                    TempData["msg"] = "修改成功";
                    return RedirectToAction("Index");
                }
                catch (Exception)
                {

                    TempData["msg"] = "修改失败!";
                    return RedirectToAction("Edit",new { id=id});
                }
                
            }
            else
            {
                //没有此数据
                TempData["msg"] = "提交数据之前数据被其他用户已删除!!";
                return RedirectToAction("Index");
            }
        }

    }
}

@{
    ViewBag.Title = "Index";
}
@using WebApplication1.Models

<h2>学生列表</h2>

    @ViewData["aa"]
    @TempData["msg"]
    <table width="100%">
    <tr><th>姓名</th><th>学号</th><th>性别</th><th>操作</th></tr>
    @{
        List<student> list = ViewData["list"] as List<student>;

    }
    @{
        foreach (var item in list)
        {
        <tr>
            <td>@item.stuName</td>
            <td>@item.stuID</td>
            <td>@item.sex</td>
            <td>@* 在MVC里提供了2个helper类，htmlHelper,UrlHelper类可以生成html代码和url代码，使用比较方便
                    <a href='student/delete'/@item.stuID>删除</a>
                @Url.Action("delete", "student", new {id=item.stuID})*@
                @Html.ActionLink("编辑", "Edit", new {id=item.stuID})|
                @Html.ActionLink("删除", "Delete", new { id = item.stuID })
            </td>
                
        </tr>
        
            
        }
    }
    </table>
    @Html.ActionLink("新增","Insert")

@{
    ViewBag.Title = "Insert";
}

<h2>新增页面</h2>
@TempData["msg"]
<p>
    @Html.ValidationSummary();
</p>
@{
    using (Html.BeginForm("InsertOK","LeaveMsg", FormMethod.Post))
    {//创建的对象会在using语句块结束时关闭对象

        <span>用户名</span> @Html.TextBox("stuName")<br />
        <span>学号</span> @Html.TextBox("stuNo")<br />
        <span>性别</span> @Html.TextBox("sex")<br />
         <span>评论</span> @Html.TextArea("remark",null,5,30,null)<br />
        <input type="submit" value="新增" />
        @Html.ActionLink("返回列表", "Index"); 

    }
    
}

@{
    ViewBag.Title = "Edit";
}

<h2>编辑信息</h2>
@TempData["msg"]
<p>
    @Html.ValidationSummary();
</p>
@{
    using (Html.BeginForm("Update", "LeaveMsg", FormMethod.Post))
    {
        @Html.Hidden("id")
        <span>用户名</span> @Html.TextBox("stuName")<br />
            <span>学号</span> @Html.TextBox("stuNo")<br />
            <span>性别</span> @Html.TextBox("sex")<br />
            <span>评论</span> @Html.TextArea("remark", null, 5, 30, null)<br />
            <input type="submit" value="修改" />
            @Html.ActionLink("返回列表", "Index");
    }

}