利用XMLHTTP下載檔案

利用XMLHTTP下載檔案，和以前的方法一樣，先添加引用－COM－Microsoft Xml 3.0，然後在代碼開始處寫：

using MSXML2;

下面就是主要的代碼：

private void Page_Load(object sender, System.EventArgs e)
{ 
 string Url = "http://dotnet.aspx.cc/Images/logoSite.gif";
 string StringFileName = Url.Substring(Url.LastIndexOf("/") + 1);
 string StringFilePath = Request.PhysicalApplicationPath;
 if(!StringFilePath.EndsWith("/")) StringFilePath += "/";
 MSXML2.XMLHTTP _xmlhttp = new MSXML2.XMLHTTPClass();
 _xmlhttp.open("GET",Url,false,null,null);
 _xmlhttp.send("");
 if( _xmlhttp.readyState == 4 )
 {
  if(System.IO.File.Exists(StringFilePath + StringFileName))
   System.IO.File.Delete(StringFilePath + StringFileName);
  System.IO.FileStream fs = new System.IO.FileStream(StringFilePath + StringFileName, System.IO.FileMode.CreateNew);
  System.IO.BinaryWriter w = new System.IO.BinaryWriter(fs);
  w.Write((byte[])_xmlhttp.responseBody);
  w.Close();
  fs.Close();
  Response.Write ("檔案已經得到。<br><a href='" + Request.ApplicationPath + StringFileName +"' target='_blank'>");
  Response.Write ("查看" + StringFileName + "</a>");
 }
 else
 Response.Write (_xmlhttp.statusText);
 Response.End();
}