ASP.NET FileUpload控件使用

 1  protected void fileBut_Fun(object sender, EventArgs e)
 2     {
 3 
 4          
 5 
 6          if (FileUpload1.HasFile)//判读是否有文件
 7          {
 8              
 9              String filename = FileUpload1.FileName;//得到文件在本地的路径，及全路径
10              String kzm = filename.Substring(filename.LastIndexOf("."));//将扩展名存放到变量kzm中
11              String uploadfilename = Server.MapPath("upload") + "\\" + filename;//得到文件在服务器上的路径和文件名。
12            
13              if (kzm.Equals(".bat"))//判断扩展名
14              {
15                  Response.Write("<script>alert(‘不允许上传.bat文件‘);</script>");
16                  return;
17              }
18              if (File.Exists(uploadfilename))
19              {         //判断重名
20                  Response.Write("<script>alert(‘命名重复，请更换图片名称！‘);</script>");
21              }
22              else
23              {
24                  int a = FileUpload1.PostedFile.ContentLength;
25                  if (a <= 8388608)
26                  {
27                      try
28                      {
29                          int n = FileUpload1.PostedFile.ContentLength;
30 
31                          Response.Write(Convert.ToString(n));
32                          FileUpload1.SaveAs(uploadfilename);//将文件上传到服务器上。
33 
34                      }
35                      catch (Exception ex)
36                      {
37                          Response.Write("<script>alert(‘" + ex.Message.ToString() + "‘);</script>");
38                      }
39                  }
40                  else 
41                  {
42                      Response.Write("<script>alert(‘附件不得超过8M！‘);</script>");
43 
44                  }
45 
46 
47              }
48          }
49          else
50          {
51              Response.Write("<script>alert(‘你还没选择上传文件！‘);</script>");
52 
53          }
54         
55         }

 <httpRuntime executionTimeout="500" maxRequestLength="409600" useFullyQualifiedRedirectUrl="false" minFreeThreads="8" minLocalRequestFreeThreads="4" appRequestQueueLimit="100" />