public bool downfile(string url,string LocalPath)
  {
   try
   {
    Uri u = new Uri(url);
    HttpWebRequest mRequest = (HttpWebRequest)WebRequest.Create(u);
    mRequest.Method = "GET";
    mRequest.ContentType = "application/x-www-form-urlencoded";

    HttpWebResponse wr = (HttpWebResponse)mRequest.GetResponse();

    Stream sIn = wr.GetResponseStream();
    FileStream fs = new FileStream(LocalPath, FileMode.Create, FileAccess.Write);

    long length = wr.ContentLength;
    long i = 0;
    decimal j=0;
    
    while (i < length)
    {
     byte[] buffer = new byte[1024];
     i += sIn.Read(buffer, 0, buffer.Length);
     fs.Write(buffer, 0, buffer.Length);
     
     if((i % 1024)==0)
     {
      j=Math.Round(Convert.ToDecimal((Convert.ToDouble(i)/Convert.ToDouble(length))*100),4);
      statusBar1.Text="当前下载文件大小:"+length.ToString()+"字节   当前下载大小:"+i+"字节 下载进度"+j.ToString()+"%";
      
     }
     else
     {
      statusBar1.Text="当前下载文件大小:"+length.ToString()+"字节   当前下载大小:"+i+"字节";
     }
     
    }

    sIn.Close();
    wr.Close();
    fs.Close();
    return true;
   }
   catch { return false; }
  }

------解决方案--------------------
不懂C#只能给梅子顶

------解决方案--------------------
C# codepublicbool downfile(string url,string LocalPath)
 {try
 {
   Uri u=new Uri(url);
   HttpWebRequest mRequest= (HttpWebRequest)WebRequest.Create(u);
   mRequest.Method="GET";
   mRequest.ContentType="application/x-www-form-urlencoded";

   HttpWebResponse wr= (HttpWebResponse)mRequest.GetResponse();

   Stream sIn= wr.GetResponseStream();
   FileStream fs=new FileStream(LocalPath, FileMode.Create, FileAccess.Write);long length= wr.ContentLength;long i=0;decimal j=0;while (i < length)
   {byte[] buffer=newbyte[1024];
   i+= sIn.Read(buffer,0, buffer.Length);
   fs.Write(buffer,0, buffer.Length);if((i%1024)==0)
   {
     j=Math.Round(Convert.ToDecimal((Convert.ToDouble(i)/Convert.ToDouble(length))*100),4);
     statusBar1.Text="当前下载文件大小:"+length.ToString()+"字节  当前下载大小:"+i+"字节 下载进度"+j.ToString()+"%";
   
   }else
   {
     statusBar1.Text="当前下载文件大小:"+length.ToString()+"字节  当前下载大小:"+i+"字节";
   }
   
   }

   sIn.Close();
   wr.Close();
   fs.Close();returntrue;
 }catch {returnfalse; }
 }  

OK

------解决方案--------------------
ftpwebrequest下载文件
string filePath = @"";  
       const string url = "";  
       try  
       {  
           using (WebClient wc = new WebClient())  
           {  
               string html = wc.DownloadString(url);  
               using (StreamWriter writer = new StreamWriter(filePath,false,wc.Encoding))  
               {  
                   writer.Write(html);  
                   writer.Flush();  
               }  
           }  
       }  
       catch (Exception ex)  
       {  
           Console.WriteLine(ex.Message);  
       }  
       Console.Read();