ASP.NET上传判断类型代码,Asp.Net代码库,德仔网

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代码分类
【Asp.Net】 ASP.NET上传判断类型
作者:Dezai.CN / 发布于2012/6/5/ 478
ASP.NET上传判断类型
<div>using System;    
using System.Collections.Generic;    
using  System.Web.UI.WebControls;    
using System.IO;    
namespace  0x001.Pack    
{    
<font color="#0000ff">public</font> enum  FileExtension    
{    
JPG =  255216,    
GIF = 7173,    
BMP =  6677,    
PNG = 13780    
// 255216  jpg;    
// 7173 gif;    
// 6677  bmp,    
// 13780 png;    
// 7790 exe  dll,    
// 8297 rar    
// 6063  xml    
// 6033 html    
// 239187  aspx    
// 117115 cs    
// 119105  js    
// 210187 txt    
//255254  sql    
}    
<font color="#0000ff">public</font> <font color="#0000ff">class</font> FileValidation    
{    
static bool  IsAllowedExtension() static bool IsAllowedExtension(FileUpload fu,  FileExtension[]  fileEx)    
{    
int fileLen =  fu.PostedFile.ContentLength;    
byte[] imgArray =  <font color="#0000ff">new</font>  byte[fileLen];    
fu.PostedFile.InputStream.Read(imgArray,  0, fileLen);    
MemoryStream ms = <font color="#0000ff">new</font>  MemoryStream(imgArray);    
System.IO.BinaryReader br  = <font color="#0000ff">new</font>  System.IO.BinaryReader(ms);    
<font color="#0000ff">string</font> fileclass = "";    
byte  buffer;    
try    
{    
buffer  = br.ReadByte();    
fileclass =  buffer.ToString();    
buffer =  br.ReadByte();    
fileclass +=  buffer.ToString();    
}    
catch    
{    
}    
br.Close();    
ms.Close();    
foreach  (FileExtension fe <font color="#0000ff">in</font>  fileEx)    
{    
<font color="#0000ff">if</font> (Int32.Parse(fileclass) ==  (int)fe)    
return <font color="#0000ff">true</font>;    
}    
return  <font color="#0000ff">false</font>;    
}    
}    
}    
上传事件判断上传类型      
void btnUpload_Click() void btnUpload_Click(object sender, EventArgs  e)    
{    
<font color="#0000ff">string</font> filename =  "";    
Boolean fileOK = <font color="#0000ff">false</font>;    
<font color="#0000ff">if</font>  (FileUpload1.HasFile)    
{    
<font color="#0000ff">String</font> fileExtension =  System.IO.Path.GetExtension(FileUpload1.FileName).ToLower();    
<font color="#0000ff">String</font>[] allowedExtensions = { <font color="#800000">".gif"</font>, <font color="#800000">".png"</font>, <font color="#800000">".jpeg"</font>, <font color="#800000">".jpg"</font>  };    
<font color="#0000ff">for</font> (int i = 0; i <  allowedExtensions.Length; i++)    
{    
<font color="#0000ff">if</font> (fileExtension  == allowedExtensions)    
{    
fileOK = <font color="#0000ff">true</font>;    
}    
}    
}    
FileExtension[] fe  = { FileExtension.BMP, FileExtension.GIF, FileExtension.JPG, FileExtension.PNG  };    
<font color="#0000ff">if</font> (fileOK &&  FileValidation.IsAllowedExtension(FileUpload1, fe))    
{    
<font color="#0000ff">string</font> fileExt =  System.IO.Path.GetExtension(FileUpload1.FileName).ToLower();    
filename = <font color="#800000">"/Images/"</font> + DateTime.Now.ToString(<font color="#800000">"yyyyMMddHHmmss"</font>) + fileExt;    
FileUpload1.PostedFile.SaveAs(Server.MapPath(filename));    
}    
<font color="#0000ff">else</font>    
{    
LTP.Common.MessageBox.Show(this, <font color="#800000">"只支持以下格式的图片<a href="file://rjpg,bmp,gif,png/" target="_blank">\\rJPG,BMP,GIF,PNG</a>"</font>);    
return;    
}    
} 
</div>
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　上传判断类型　
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