.Net 使用文件上传控件FileUpload上传图片

例1：

来源：http://long546324.iteye.com/blog/349946

Default.aspx文档：

<%@ 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：

 1 using System;
 2 using System.Configuration;
 3 using System.Data;
 4 using System.Linq;
 5 using System.Web;
 6 using System.Web.Security;
 7 using System.Web.UI;
 8 using System.Web.UI.HtmlControls;
 9 using System.Web.UI.WebControls;
10 using System.Web.UI.WebControls.WebParts;
11 using System.Xml.Linq;
12 
13 public partial class _Default : System.Web.UI.Page 
14 {
15     protected void Page_Load(object sender, EventArgs e)
16     {
17 
18     }
19     protected void btnFileUpload_Click(object sender, EventArgs e)
20     {
21         Boolean fileOK = false;
22         //获取上传的文件名
23         string fileName = this.FileUpload1.FileName;
24         //获取物理路径
25         String path = Server.MapPath("~/Images/");
26         //判断上传控件是否上传文件
27         if (FileUpload1.HasFile)
28         {
29             //判断上传文件的扩展名是否为允许的扩展名".gif", ".png", ".jpeg", ".jpg" ,".bmp"
30             String fileExtension = System.IO.Path.GetExtension(fileName).ToLower();
31             String[] Extensions = { ".gif", ".png", ".jpeg", ".jpg" ,".bmp"};
32             for (int i = 0; i < Extensions.Length; i++)
33             {
34                 if (fileExtension == Extensions[i])
35                 {
36                     fileOK = true;
37                 }
38             }
39         }
40         //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
41         if (fileOK)
42         {
43             try
44             {
45                 this.FileUpload1.PostedFile.SaveAs(path + fileName);
46                 MessageBox( "文件上传完毕");
47             }
48             catch (Exception ex)
49             {
50                MessageBox("文件不能上传，原因：" + ex.Message);
51             }
52         }
53         else
54         {
55             MessageBox( "不能上传这种类型的文件");
56         }
57     }
58 
59     protected void MessageBox(string str)
60     {
61         Page.ClientScript.RegisterStartupScript(Page.GetType(), "message", "<script language='javascript' defer>alert('"+str+"');</script>"); 
62     }
63 }

View Code