【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。

   1: <browsers>

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

   3:     <identification>

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

   5:       <userAgent nonMatch="IEMobile" />

   6:     </identification>

   7:     <capture>

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

   9:     </capture>

  10:     <capabilities>

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

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

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

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

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

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

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

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

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

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

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

  22:     </capabilities>

  23:   </browser>

  24:  

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

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

  27:     <identification>

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

  29:     </identification>

  30:  

  31:     <capabilities>

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  54:     </capabilities>

  55:   </browser>

  56: </browsers>