单个文件上传类(可以自定义配置)

调用可以很灵活，代码如下：

using  System;
using  System.Configuration;
using  System.Web;
using  System.Web.UI;
using  System.Text;
using  System.IO;

namespace  aspnet_test
{
     ///   <summary>
     ///  单个文件上传类
     ///  
     ///  可以自定义：上传目录，上传文件类型、大小，是否使用随机上传文件名。
     ///  
     ///  作者：laifangsong  QQ：25313644  GMail:[email protected]
     ///  原文： http://www.cnblogs.com/jiny-z/archive/2007/05/30/764762.html
     ///   </summary>
     public   class  UploadFile_Single
    {
         /*  web.config设置：
         * <appSettings>        
         *     <add key="uploadDir" value="UploadFiles/" />
         *   <add key="uploadFileExt" value="gif|jpg|jpeg|png|bmp|doc|xls|hlp|chm|rar|zip" />    
         *   <add key="uploadFileSize" value="2048" />
         *   <add key="isUseRandFileName" value="true" />            
         * </appSettings>
         * 
         * private string uploadDir = ConfigurationSettings.AppSettings["uploadDir"];;
         * private string uploadFileExt = ConfigurationSettings.AppSettings["uploadFileExt"];
         * private int uploadFileSize = int.Parse(ConfigurationSettings.AppSettings["uploadFileExt"]);
         * private bool isUseRandFileName = bool.Parse(ConfigurationSettings.AppSettings["uploadFileExt"]);
         *  */

         // 上传目录，相对于本文件路径；以“/”结尾；如果目录不存在，会自动创建；如果要启用绝对路径，写法:“/虚拟目录名称/上传文件目录名称/”
         private   string  uploadDir  =   " UploadFiles/ " ;
         // 允许上传文件类型，逗号隔开
         private   string  uploadFileExt  =   " gif|jpg|jpeg|png|bmp|doc|xls|hlp|chm|rar|zip " ;
         // 允许上传文件大小，k 为单位
         private   int  uploadFileSize  =   2048 ;
         // 是否使用随机上传文件名；如果不使用，会覆盖上传目录的同名文件
         private   bool  isUseRandFileName  =   true ;

         // 上传结果
         private   string  uploadResult  =   "" ;
         // 上传文件保存路径
         private   string  uploadPath  =   "" ;
        
         public   string  UploadDir
        {
             get
            {
                 return  uploadDir;
            }
             set
            {
                uploadDir  =  value;
            }
        }
         public   string  UploadFileExt
        {
             get
            {
                 return  uploadFileExt;
            }
             set
            {
                uploadFileExt  =  value;
            }
        }
         public   int  UploadFileSize
        {
             get
            {
                 return  uploadFileSize;
            }
             set
            {
                uploadFileSize  =  value;
            }
        }
         public   bool  IsUseRandFileName
        {
             get
            {
                 return  isUseRandFileName;
            }
             set
            {
                isUseRandFileName  =  value;
            }
        }
         public   string  UploadResult
        {
             get
            {
                 return  uploadResult;
            }
        }
         public   string  UploadPath
        {
             get
            {
                 return  uploadPath;
            }
        }        


         // 上传文件方法
         public   bool  Upload(Page page)
        {
            HttpPostedFile uploadFile  =  page.Request.Files[ 0 ];
             // 获取上传文件属性
             string  fileFullName  =  uploadFile.FileName;
             string  contentType  =  uploadFile.ContentType;
             int  contentLength  =  uploadFile.ContentLength;
             // 取得文件名
             string  fileName  =  System.IO.Path.GetFileName(fileFullName);
             // 取得扩展名
             string  fileExt  =  System.IO.Path.GetExtension(fileName).Remove( 0 ,  1 );
             // 检测文件类型
             if ( ( " | " + UploadFileExt + " | " ).IndexOf( ( " | " + fileExt + " | " ) )  <   0  )
            {
                uploadResult  =   " <font color='red'><b>上传文件格式错误！允许上传文件类型（ "   +  uploadFileExt  +   " ）</b></font> " ;
                 return   false ;
            }
             // 检测文件大小
             if (contentLength < 1   ||  contentLength > uploadFileSize * 1024 )
            {
                uploadResult  =   " <font color='red'><b>上传文件大小错误！最大允许上传  "   +  uploadFileSize  +   "  KB</b></font> " ;
                 return   false ;                
            }
             // 如果上传目录不存在，创建目录
             if ( ! uploadDir.EndsWith( " / " )) uploadDir  +=   " / " ;
             string  tempPath  =   "" ;
             string  tempMapPath  =   "" ;
             string  tempDir  =  uploadDir.Substring( 0 , 1 ) != " / "   ?  uploadDir : uploadDir.Substring(uploadDir.IndexOf( " / " ,  2 ) + 1 ) ;
             while (tempDir.IndexOf( " / " ) >= 0 )
            {
                tempPath  +=  tempDir.Substring( 0 , tempDir.IndexOf( " / " ) + 1 );            
                tempMapPath  =   System.Web.HttpContext.Current.Server.MapPath(tempPath);
                 if ( ! Directory.Exists(tempMapPath))
                {
                    Directory.CreateDirectory(tempMapPath);
                }
                tempDir  =  tempDir.Substring(tempDir.IndexOf( " / " ) + 1 );
            }
             // 随机文件名
             if (isUseRandFileName)
            {
                fileName  =  DateTime.Now.ToString( " yyyyMMddhhmmss " )  +  ( new  Random()).Next( 100 ,  1000 ).ToString()  +   " . "   +  fileExt;
            }

             string  saveFilePath  =   System.Web.HttpContext.Current.Server.MapPath(uploadDir)  +   @" \ "   +  fileName;            
            uploadFile.SaveAs(saveFilePath);

            uploadPath  =  uploadDir + fileName;
             // SaveUploadPathToDB(uploadPath);

            uploadResult  +=   " <font color='blue'><b>文件上传成功！</b></font> "   +   " <br/><br/> "   +
                 " <b>保存位置：</b> "   +  uploadPath;
    
             return   true ;
        }

         // 将上传文件路径存入数据库
         private   void  SaveUploadPathToDB( string  uploadPath)
        {
             // string sql = "update table 1 set f_uploadpath='" & uploadPath & "' where ";
             // TSQL.ExecuteNonQuery(sql, null);
        }

    }
}

调用：

UploadFile_Single upfile  =   new  UploadFile_Single();
upfile.Upload( this );

            UploadFile_Single upfile  =   new  UploadFile_Single();
            upfile.UploadDir  =   " UploadFiles/ " ;
            upfile.UploadFileExt  =   " gif|jpg|jpeg|png|bmp " ;
            upfile.UploadFileSize  =   1024 ;
            upfile.IsUseRandFileName  =   true ;
            upfile.Upload( this );

            UploadFile_Single upfile  =   new  UploadFile_Single();
            upfile.UploadDir  =   " /虚拟目录名称/UploadFiles/1/2/3/ " ;
            upfile.UploadFileExt  =   " gif|jpg|jpeg|png|bmp " ;
            upfile.UploadFileSize  =   1024 ;
            upfile.IsUseRandFileName  =   true ;
            upfile.Upload( this );
               
               Response.Write(upfile.UploadResult); //上传结果信息
               Response.Write(upfile.UploadPath); //上传保存路径

(上传目录可以用绝对路径，也可用相对路径；如果上传目录不存在，会自动创建)