在服务端用xmlhttp对象

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。<br><a href='" + Request.ApplicationPath + StringFileName +"' target='_blank'>");
		Response.Write ("查看" + StringFileName + "</a>");
	}
	else
	Response.Write (_xmlhttp.statusText);
	Response.End();
}

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