Net4.0的网站在IE10、IE11出现“__doPostBack未定义”的解决办法。

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方法一、浏览器设置成兼容模式。

方法二、安装服务器版的.Net40的补丁。http://download.csdn.net/detail/5653325/6642051

方法三、点击VS的工具菜单--》库程序包管理器--》程序包管理器控制台（如果没有“库程序包管理器”的菜单，就先点那个“扩展管理器”，安装一个叫“NuGet程序包管理器”，然后就会有了。），点击后下面会出现一个连接PowerShell的控制台，等控制台加载完毕后输入

install-package App_BrowsersUpdate 回车

等待安装完成后，网站根目录下面会出现一个App_BrowsersUpdate目录。然后再访问就不会出现“__doPostBack未定义”的错误提示了。

以上的方法三解决不了IE11在NET4.0下出现“__doPostBack未定义”的办法。

IE11的解决方法是（下面方法二选一）：

一、服务器安装.net4.0的补丁（下载地址：http://download.csdn.net/detail/5653325/6642051）

二、在上面方法三生成的App_Browsers\ie.browser添加以下文字，在顶部的<browsers>下面：

[html] view plaincopyprint?

<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>

转自：http://blog.csdn.net/wdw984/article/details/17001447

  <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>

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