在.NET中利用XMLHTTP下载文件

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(); }