.Net中使用文件上传控件上传图片

Default.aspx

 

View Code 
 1 <%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default" %>
 2 
 3 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 4 
 5 <html xmlns="http://www.w3.org/1999/xhtml">
 6 <head runat="server">
 7     <title>上传图片</title>
 8 </head>
 9 <body>
10     <form id="form1" runat="server">
11     <div>    
12         <asp:FileUpload ID="FileUpload1" runat="server" />
13         <asp:Button ID="btnFileUpload" runat="server" Text="上传" 
14             onclick="btnFileUpload_Click" />
15     </div>
16     </form>
17 </body>
18 </html>

Default.aspx.cs

 

View Code 
 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 }


posted @ 2012-03-19 19:52  AlanCoder  阅读(162)  评论(0)    收藏  举报
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