ASP.NET FileUpload 上传图片实例

代码如下:
<table><tr>
<td>
<asp:ValidationSummary ID=”ValidationSummary1″ runat=”server” />
<br />
<asp:FileUpload ID=”FileUpload1″ runat=”server” />
<asp:Button ID=”btn_upload” runat=”server” OnClick=”btn_upload_Click”
Text=”Upload” />
<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
代码如下:
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，FileUpload 默认上传文件最大为4MB。这是在网上找到的。
如果要增加，则可以在Machine。
config里面进行修改
代码如下:
<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]
/>
。