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

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　　最近项目在 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>

<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>

自己在项目中添加的文件：

<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>