zoukankan html css js c++ java

037. asp.netWeb用户控件之五使用用户控件实现文件上传功能

fileUpload.ascx代码:

<%@ Control Language="C#" AutoEventWireup="true" CodeFile="fileUpload.ascx.cs" Inherits="fileUpload" %>
<style type="text/css">
    .style3
    {
        width: 196px;
    }
    .style4
    {
        width: 507px;
        height: 269px;
    }
    .style5
    {
        width: 82%;
    }
    .style6
    {
        height: 180px;
    }
    .style7
    {
        width: 102px;
        text-align: right;
    }
</style>
<table align="left" cellpadding="0" cellspacing="0" class="style4" 
    style="background-image: url('upload.JPG')">
    <tr>
        <td valign="top">
            <table align="center" cellpadding="0" cellspacing="0" class="style5" 
                style="font-size: small">
                <tr>
                    <td class="style6" colspan="3">
                    </td>
                </tr>
                <tr>
                    <td class="style7">
                        选择文件：</td>
                    <td class="style3">
            <asp:FileUpload ID="FileUpload1" runat="server" />
                    </td>
                    <td style="text-align: left">
                        <asp:ImageButton ID="ImageButton1" runat="server" ImageUrl="~/WebControlUpload/shangchuan.JPG" onclick="ImageButton1_Click" />
                    </td>
                </tr>
                <tr>
                    <td colspan="3">
                        &nbsp;</td>
                </tr>
            </table>
        </td>
    </tr>
</table>

fileUpload.ascx.cs代码:

public partial class fileUpload : System.Web.UI.UserControl
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void ImageButton1_Click(object sender, ImageClickEventArgs e)
    {
        string serverPath = Server.MapPath("UpLoad");                //获取服务器端目录绝对路径
        if (!System.IO.Directory.Exists(serverPath))                //如果不存在该目录
        {
            System.IO.Directory.CreateDirectory(serverPath);            //创建该目录
        }
        if (FileUpload1.HasFile)                            //判断是否选择上传的文件
        {
            string imgtype = FileUpload1.PostedFile.ContentType;//获取客户端发送的文件类型
            imgtype = imgtype.Substring(0, 5);
            if (imgtype != "image")
            {
                Page.ClientScript.RegisterStartupScript(this.GetType(), "", "alert('请选择图片');", true);
            }
            else
            {
                int filesize = FileUpload1.PostedFile.ContentLength / 1024 / 1024;//获取上传文件的大小
                if (filesize > 8)                            //如果大于8M
                {
                    Page.ClientScript.RegisterStartupScript(this.GetType(), "", "alert('只允许上传不大于8兆的文件');", true);                                    //弹出提示信息
                    return;
                }
                else                            //否则
                {
                    //使用SaveAs方法将上传的文件存储到服务器中
                    FileUpload1.SaveAs(serverPath + "\" + FileUpload1.FileName);
                    Page.ClientScript.RegisterStartupScript(this.GetType(), "", "alert('上传成功');", true);
                }
            }
        }
        else                                    //如果没有选择文件
        {
            //弹出提示信息
            Page.ClientScript.RegisterStartupScript(this.GetType(), "", "alert('请选择文件');", true);
return;
        }
    }
}

Default.aspx代码:

<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default" %>
<%@ Register src="fileUpload.ascx" tagname="fileUpload" tagprefix="uc1" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>具有文件上传功能的用户控件</title>
    <style type="text/css">
        #form1
        {
            width: 639px;
            height: 152px;
            text-align: right;
        }
    </style>
</head>
<body>
    <form id="form1" runat="server">
    <uc1:fileUpload ID="fileUpload1" runat="server" />
    </form>
</body>
</html>

最终效果图:

查看全文

相关阅读:
如何理解联合文件系统？
Docker 学习笔记(一)
Bzoj 3124: [Sdoi2013]直径题解
 Bzoj 3131 [Sdoi2013]淘金题解
 欧拉路（题目）
硬币问题
 线段树、树状数组
 Splay树、Treap树
 模拟退火
 广搜题目（一本通）

原文地址：https://www.cnblogs.com/wxylog/p/6187593.html