.Net中使用文件上传控件上传图片

Default.aspx文档

代码

<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!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>上传图片</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:FileUpload ID="FileUpload1" runat="server" />
        <asp:Button ID="btnFileUpload" runat="server" Text="上传"
            onclick="btnFileUpload_Click" />
    </div>
    </form>
</body>
</html>

Default.aspx.cs文档

代码

using System;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;

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

    }
    protected void btnFileUpload_Click(object sender, EventArgs e)
    {
        Boolean fileOK = false;
        //获取上传的文件名
        string fileName = this.FileUpload1.FileName;
        //获取物理路径
        String path = Server.MapPath("~/Images/");
        //判断上传控件是否上传文件
        if (FileUpload1.HasFile)
        {
            //判断上传文件的扩展名是否为允许的扩展名".gif", ".png", ".jpeg", ".jpg" ,".bmp"
            String fileExtension = System.IO.Path.GetExtension(fileName).ToLower();
            String[] Extensions = { ".gif", ".png", ".jpeg", ".jpg" ,".bmp"};
            for (int i = 0; i < Extensions.Length; i++)
            {
                if (fileExtension == Extensions[i])
                {
                    fileOK = true;
                }
            }
        }
        //如果上传文件扩展名为允许的扩展名，则将文件保存在服务器上指定的目录中
        if (fileOK)
        {
            try
            {
                this.FileUpload1.PostedFile.SaveAs(path + fileName);
                MessageBox( "文件上传完毕");
            }
            catch (Exception ex)
            {
               MessageBox("文件不能上传，原因：" + ex.Message);
            }
        }
        else
        {
            MessageBox( "不能上传这种类型的文件");
        }
    }

    protected void MessageBox(string str)
    {
        Page.ClientScript.RegisterStartupScript(Page.GetType(), "message", "<script language='javascript' defer>alert('"+str+"');</script>");
    }
}

转自：http://long546324.javaeye.com/blog/349946