<%@ Page Language="C#" AutoEventWireup="true"CodeFile="FileUpload.aspx.cs"Inherits="FileUpload" %> 
 
<!DOCTYPE htmlPUBLIC "-//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></title> 
 
</head> 
 
<body> 
 
 <form id="form1" runat="server"> 
 
 <div> 
 
 </div> 
 
 <asp:FileUploadIDasp:FileUploadID="myFileUpload" runat="server"/> 
 
 <asp:Label ID="lblInfo" runat="server"></asp:Label> 
 
 <br /> 
 
 <asp:ButtonIDasp:ButtonID="btnFileUpload" runat="server"onclick="btnFileUpload_Click" 
 
 Text="上傳文件"/> 
 
 </form> 
 
</body> 
 
</html>

C#代碼:

public partialclass FileUpload : System.Web.UI.Page 
 
{ 
 
 private string uploadDirectory;//文件保存路徑字符串. 
 
 protected void Page_Load(objectsender, EventArgs e) 
 
 { 
 
 //默認(rèn)將文件保存在站點(diǎn)根文件下的Uploads中 
 
 uploadDirectory = Path.Combine(Request.PhysicalApplicationPath,"Uploads"); 
 
 } 
 
 //上傳文件. 
 
 protected void btnFileUpload_Click(objectsender, EventArgs e) 
 
 { 
 
 //判斷是否有文件提交. 
 
 if (myFileUpload.PostedFile.FileName== "") 
 
 { 
 
  lblInfo.Text = "提交的文件為空!請(qǐng)您選擇要上傳的文件!"; 
 
 } 
 
 else 
 
 { 
 
  //判斷文件的大小是否超過200KB. 
 
  if (myFileUpload.PostedFile.ContentLength> 204800) 
 
  { 
 
  lblInfo.Text = "文件不能超過200KB"; 
 
  } 
 
  else 
 
  { 
 
  //判斷文件的類型. 
 
  string extension = Path.GetExtension(myFileUpload.PostedFile.FileName); 
 
  switch (extension.ToLower()) 
 
  { 
 
   case ".bmp": 
 
   case ".gif": 
 
   case ".jpg": 
 
   break; 
 
   default: 
 
   lblInfo .Text ="文件類型不是 *.bmp |*.gif|*.jpg"; 
 
   return ; 
 
  } 
 
  //將文件保存在web服務(wù)器中的我們定義的uploadDirectory變量的路徑下. 
 
  //文件名維持不變. 
 
  string serverFileName= Path.GetFileName(myFileUpload.PostedFile.FileName); 
 
  string fullUploadPath= Path.Combine(uploadDirectory,serverFileName); 
  try 
 
  { 
   myFileUpload.PostedFile.SaveAs(fullUploadPath); //文件上傳. 
 
   lblInfo.Text = "文件:"+ serverFileName; 
 
   lblInfo.Text += "成功上傳到 "; 
 
   lblInfo.Text += fullUploadPath; 
  }  
  catch (Exception e2) 
  { 
   lblInfo.Text = e2.Message;//上傳文件出錯(cuò)信息. 
  } 
  } 
 } 
 } 
}

顯示: