ASP.NET使用文件上传控件上传图片

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ASPX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>

CS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 = ; 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>");

    }

}