在WinForm程式中下載網站中的檔案

在WinForm程式中有時會直接從網站上下載檔案，這裡的檔案為rar檔案或是exe檔案或是文字檔等等。。

編程的時候不要忘記添加using System.Net;的引用（在其中要用到HttpWebResponse,httpWebRequest).

下面是一簡單的應用例子：

#region download files from server 

  /// <summary>
  ///
  /// </summary>  
  /// <param name="downPath"></param>
  /// <param name="tabName"></param>
  private void LoadFiles()
  {
 
   string fromPath = "http://127.0.0.1//test.rar";    //源檔案路徑
   string downPath = "c://test.rar";                                    //目標路徑
   try
   {
    //create web request/response
    HttpWebResponse Response;
    HttpWebRequest Request;
    Request = (HttpWebRequest)HttpWebRequest.Create(fromPath);
    Request.Headers.Add("Translate: f");
    Request.Credentials = CredentialCache.DefaultCredentials;
   
    Response = (HttpWebResponse)Request.GetResponse();

    Stream respStream = null;
    respStream = Response.GetResponseStream();
    int FileSize=int.Parse(Response.ContentLength.ToString()); 
    //Do the Download
    byte[] buffer = new byte[FileSize];
    FileStream fs = File.Open(downPath,FileMode.Create, FileAccess.Write);
    int length;
    length=respStream.Read(buffer, 0, FileSize);
    long writeLength=length;
    while(length!=0)
    {
     fs.Write(buffer, 0, length);
     length=respStream.Read(buffer, 0, FileSize);
     writeLength+=(long)length;
    }
    fs.Close(); 
   }
   catch
   {
    throw;
   }
  }
  #endregion