经在Server2008R2,Windows7,Windows10测试，只要修改相应的 User Agent 即可实现，参考代码(以IE8模式工作)如下：

var ieversion = (new WebBrowser()).Version.Major;
            string ua = "Mozilla/4.0 (MSIE 8.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E)";
            if (ieversion <= 8)
                ua = "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E)";