【转】asp.net 项目在 IE 11 下出现 “__doPostBack”未定义 的解决办法

最近我们运营的网站有用户反馈在 IE 11 下<asp:LinkButton> 点击出现 “__doPostBack”未定义”，经过一番google,终于知道了原因：ASP.NET 可能无法辨识出一些浏览器的最新版本，还会经常把它们看做是低级的浏览器。（也就是： 不支持JavaScript。）
详见： http://blogs.msdn.com/b/scott_hanselman/archive/2011/10/28/asp-net-ie10-dopostback-javascript-ff5.aspx 本人按照该文所提供的解决办法始终未能得到解决，于是按提示尝试用单个站点的方式修复。
在项目根目录 App_Browsers 下新建 浏览器文件(.browser)，让其与IE11的 UserAgent 匹配，使 .net framework 认识这是一个已知的浏览器，可以正常地向客户端输出脚本。
在文件里输入以下内容，保存即可。

<browsers>

<browser id="IE11" parentID="Mozilla">

<identification>

<userAgent match="Trident\/7.0; rv:(?'version'(?'major'\d+)(\.(?'minor'\d+)?)(?'letters'\w*))(?'extra'[^)]*)" />

<userAgent nonMatch="IEMobile" />

</identification>

<capture>

<userAgent match="Trident/(?'layoutVersion'\d+)" />

</capture>

<capabilities>

<capability name="browser"value="IE" />

<capability name="layoutEngine" value="Trident" />

<capability name="layoutEngineVersion"value="${layoutVersion}" />

<capability name="extra"value="${extra}" />

<capability name="isColor"value="true" />

<capability name="letters"value="${letters}" />

<capability name="majorversion" value="${major}" />

<capability name="minorversion" value="${minor}" />

<capability name="screenBitDepth" value="8" />

<capability name="type" value="IE${major}" />

<capability name="version"value="${version}" />

</capabilities>

</browser>

 <!-- Mozilla/5.0 (Windows NT 6.3; Trident/7.0; rv:11,0) like Gecko -->

 <browser id="IE110" parentID="IE11">

<identification>

 <capability name="majorversion" match="11" />

</identification>

<capabilities>

 <capability name="ecmascriptversion"value="3.0" />

 <capability name="jscriptversion" value="5.6" />

 <capability name="javascript" value="true" />

 <capability name="javascriptversion"value="1.5" />

 <capability name="msdomversion" value="${majorversion}.${minorversion}" />

 <capability name="w3cdomversion"value="1.0" />

 <capability name="ExchangeOmaSupported" value="true" />

 <capability name="activexcontrols"value="true" />

 <capability name="backgroundsounds" value="true" />

 <capability name="cookies"value="true" />

 <capability name="frames" value="true" />

 <capability name="javaapplets"value="true" />

 <capability name="supportsCallback" value="true" />

 <capability name="supportsFileUpload" value="true" />

 <capability name="supportsMultilineTextBoxDisplay" value="true" />

 <capability name="supportsMaintainScrollPositionOnPostback" value="true" />

 <capability name="supportsVCard"value="true" />

 <capability name="supportsXmlHttp"value="true" />

 <capability name="tables" value="true" />

 <capability name="supportsAccessKeyAttribute"value="true" />

 <capability name="tagwriter"value="System.Web.UI.HtmlTextWriter" />

 <capability name="vbscript" value="true" />

</capabilities>

</browser>

</browsers>