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ASP.NET FileUpload 上傳圖片實(shí)例

更新時(shí)間：2009年09月01日 00:47:26 作者：

Add a FileUpload control to the aspx page

 
<table style="width: 100%"> 
<tr> 
<td> 
<asp:ValidationSummary ID="ValidationSummary1" runat="server" /> 
<br /> 
<asp:FileUpload ID="FileUpload1" runat="server" /> 
&nbsp;<asp:Button ID="btn_upload" runat="server" OnClick="btn_upload_Click" 
Text="Upload" /> 
&nbsp;&nbsp; 
<asp:CustomValidator ID="CustomValidator1" runat="server" 
ControlToValidate="FileUpload1" Display="Static" 
ErrorMessage="You should only can upload image file such as files with .jpg or gif extension" 
OnServerValidate="Image_validate">*</asp:CustomValidator> 
</td> 
</tr> 
</table> 

Add to code behind cs file

復(fù)制代碼代碼如下:

using System; 
using System.Data; 
using System.Configuration; 
using System.Collections; 
using System.Web; 
using System.Web.Security; 
using System.Web.UI; 
using System.Web.UI.WebControls; 
using System.Web.UI.WebControls.WebParts; 
using System.Web.UI.HtmlControls; 
using System.IO; 
using System.Drawing; 
public partial class practice_FileUpload : System.Web.UI.Page 
{ 
protected void Page_Load(object sender, EventArgs e) 
{ 
} 
protected void btn_upload_Click(object sender, EventArgs e) 
{ 
if (Page.IsValid) 
{ 
string path = @Page.MapPath("User_Edit.aspx").Replace("User_Edit.aspx", "") + "Documents\\"; 
string s = path + Session["UserName"].ToString(); 
if (!System.IO.Directory.Exists(path + Session["UserName"].ToString())) 
{ 
System.IO.Directory.CreateDirectory(path + Session["UserName"].ToString()); 
} 
if (FileUpload1.HasFile) 
{ 
FileUpload1.SaveAs(Server.MapPath("~/Seeker/Documents/" + Session["UserName"].ToString() + "/" + this.FileUpload1.FileName)); 
} 
} 
} 
protected void Image_validate(object source, ServerValidateEventArgs args) 
{ 
string fileExt = Path.GetExtension(FileUpload1.FileName).ToLower(); 
string fileName = Path.GetFileName(FileUpload1.FileName); 
if (fileExt != ".jpg" && fileExt != ".gif") 
{ 
args.IsValid = false; 
} 
} 
protected void CustomValidator2_ServerValidate(object source, ServerValidateEventArgs args) 
{ 
Bitmap bmIP = new Bitmap(FileUpload1.PostedFile.InputStream); 
if (bmIP.Width > 100 | bmIP.Height > 100) 
{ 
args.IsValid = false; 
} 
else 
{ 
args.IsValid = true; 
} 
} 
}

The default size of files uploaded by the FileUpload control is 4MB. This solution was found from the Internet。
值得注意的是，F(xiàn)ileUpload 默認(rèn)上傳文件最大為4MB。這是在網(wǎng)上找到的。
如果要增加，則可以在Machine.config里面進(jìn)行修改

復(fù)制代碼代碼如下:

<httpRuntime 
executionTimeout = "110" [in Seconds][number 
maxRequestLength = "4096" [number] 
requestLengthDiskThreshold = "80" [number] 
useFullyQualifiedRedirectUrl = "false" [true|false] 
minFreeThreads = "8" [number] 
minLocalRequestFreeThreads = "4" [number] 
appRequestQueueLimit = "5000" [number] 
enableKernelOutputCache = "true" [true|false] 
enableVersionHeader = "true" [true|false] 
apartmentThreading = "false" [true|false] 
requireRootedSaveAsPath = "true" [true|false] 
enable = "true" [true|false] 
sendCacheControlHeader = "true" [true|false] 
shutdownTimeout = "90" [in Seconds][number] 
delayNotificationTimeout = "5" [in Seconds][number] 
waitChangeNotification = "0" [number] 
maxWaitChangeNotification = "0" [number] 
enableHeaderChecking = "true" [true|false] 
/>