用XMLHTTP下载文件，和以前的方法一样，先添加引用－COM－Microsoft Xml 3.0，然后在代码开始处写

利用XMLHTTP下载文件，和以前的方法一样，先添加引用－COM－Microsoft Xml 3.0，然后在代码开始处写：using MSXML2;

下面就是主要的代码：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 ("文件已经得到。

");

Response.Write ("查看" + StringFileName + "");

}

else

Response.Write (_xmlhttp.statusText);

Response.End();

}