C#下载远程文件到本地

using  System;
namespace  DownRemoteFile
{
     class  DownFile
    {
         #region  成员变量

         private   string  savePath;
         private   bool  newName;

         #endregion

         #region  属性

         public   string  SavePath
        {
             set  
            { 
                savePath = value.Replace( " / " ,  " \\ " );
                 if  (savePath.LastIndexOf( " \\ " )  !=  savePath.Length  -   1 )
                    savePath  +=   " \\ " ;
            }
             get
            {
                 return  savePath;
            }
        }

         public   bool  NewName
        {
             set  { newName  =  value; }
             get  {  return  newName; }
        }

         #endregion

         #region  构造函数

         public  DownFile() 
        {
            newName  =   false ;
            savePath  =   " c:\\ " ;
        }

         #endregion

         #region  私有方法

         ///   <summary>
         ///  随机返回文件名
         ///   </summary>
         ///   <returns></returns>
         private   string  getFileName()
        {
            System.Random objDom  =   new  Random();
             int  intNum  =  objDom.Next( 1000 ,  9999 );
            objDom  =   null ;
             string  strNum  =  System.DateTime.Now.ToString( " yyyyMMddhhmmss " );
             return  strNum  +  intNum.ToString();
        }

         ///   <summary>
         ///  根据文件得到文件扩展名
         ///   </summary>
         ///   <param name="fileName"> 文件名 </param>
         ///   <returns></returns>
         private   string  getExtension( string  fileName)
        { 
             int  start = fileName.IndexOf( " . " ) + 1 ;
             string  Ext  =  fileName.Substring(start, fileName.Length  -  start);
             return  Ext;
        }

         #endregion

         #region  公共方法

         ///   <summary>
         ///  保存远程文件
         ///   </summary>
         ///   <param name="filePath"> 远程文件路径 </param>
         ///   <returns></returns>
         public   string  SaveFile( string  filePath)
        {
             string  fPath, fName, sPath;
            fPath  =  filePath.Replace( " \\ " ,  " / " );
             int  start  =  fPath.LastIndexOf( " / " )  +   1 ;
            fName  =  fPath.Substring(start, fPath.Length  -  start);
             if  (newName)
            {
                sPath  =  savePath  +  getFileName()  +   " . "   +  getExtension(fName);
            }
             else
            {
                sPath  =  savePath  +  fName;
            }
            
            System.Net.WebClient myWebClient  =   new  System.Net.WebClient();
             try
            {
                myWebClient.DownloadFile(fPath, sPath);
            }
             catch  (Exception ee)
            {
                 throw  ee;
            }
             finally
            {
                myWebClient.Dispose();
            }
             return  fName;
        }

         #endregion

    }
}