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http://msdn.microsoft.com/zh-cn/library/ms227669(VS.80).aspx

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using System;
using System.Data;
using System.Data.SqlClient;
using System.Web.UI.HtmlControls;
using System.Drawing.Imaging;
using System.Configuration;
using System.Drawing;

namespace zhuanti
{
/// <summary>
/// ÕâÊÇÒ»¸öÓÃÓÚÍæ¼ÒͶ¸åÖÐʵÏÖÍæ¼ÒÉÏ´«Îļþ¹¦ÄÜÖÐÓõ½µÄÏàÓ¦µÄº¯ÊýµÄ¹¦ÄÜÄ£¿é
/// </summary>
public class FileUpload
{
public enum File //¶¨ÒåÒ»¸öÈËÓÃÓÚ´æ·ÅÍæ¼ÒÉÏ´«ÎļþÐÅÏ¢µÄÒ»¸öÊý×é
{
FILE_SIZE , //´óС
FILE_POSTNAME, //ÀàÐÍ£¨Îļþºó׺Ãû£©
FILE_SYSNAME , //ϵͳÃû
FILE_ORGINNAME, //Ô­À´µÄÃû×Ö
FILE_PATH //Îļþ·¾¶
}
private static Random rnd = new Random(); //»ñÈ¡Ò»¸öËæ»úÊý

public static string[] UploadFile(HtmlInputFile file,string Upload_Dir) //ʵÏÖÍæ¼ÒÎļþÉÏ´«¹¦ÄܵÄÖ÷º¯Êý
{
string[] arr = new String[5];
string FileName = GetUniquelyString(); //»ñÈ¡Ò»¸ö²»Öظ´µÄÎļþÃû
string FileOrginName = file.PostedFile.FileName.Substring

(file.PostedFile.FileName.LastIndexOf("\\")+1);//»ñÈ¡ÎļþµÄԭʼÃû
if(file.PostedFile.ContentLength <=0)
{ return null; }
string postFileName;
string FilePath = Upload_Dir.ToString();
string path = Fi