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

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/alan_wdd/7367587）

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：

<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>

<!-- Mozilla/5.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4325) -->

<browser id="IE6Plus" parentID="IE">

<identification>

<capability name="majorversion" match="^[6-9]|\d{2,}$" />

</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>

<!-- Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0;) -->

<browser id="IE6to9" parentID="IE6Plus">

<identification>

<capability name="majorversion" match="^[6-9]$" />

</identification>

</browser>

<!-- Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0;) -->

<browser id="IE7" parentID="IE6to9">

<identification>

<capability name="majorversion" match="^7$" />

</identification>

<capabilities>

<capability name="jscriptversion" value="5.7" />

</capabilities>

</browser>

<!-- Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729) -->

<browser id="IE8" parentID="IE6to9">

<identification>

<capability name="majorversion" match="^8$" />

</identification>

<capabilities>

<capability name="jscriptversion" value="6.0" />

</capabilities>

</browser>

<!-- Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729) -->

<browser id="IE9" parentID="IE6to9">

<identification>

<capability name="majorversion" match="^9$" />

</identification>

<capabilities>

<capability name="jscriptversion" value="6.0" />

</capabilities>

</browser>

<!-- Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0) -->

<browser id="IE10Plus" parentID="IE6Plus">

<identification>

<capability name="majorversion" match="\d{2,}" />

</identification>

<capabilities>

<capability name="jscriptversion" value="6.0" />

</capabilities>

</browser>

<gateway id="IEbeta" parentID="IE">

<identification>

<capability name="letters" match="^([bB]|ab)" />

</identification>

<capture>

</capture>

<capabilities>

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

</capabilities>

</gateway>

</browsers>

火狐浏览器：

<browsers>

<!-- Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.0.11) Gecko/2009060215 Firefox/3.0.11 (.NET CLR 3.5.30729) -->

<browser id="Firefox3Plus" parentID="Firefox">

<identification>

<capability name="majorversion" match="[3-9]|\d{2,}" />

</identification>

<capabilities>

<capability name="javascriptversion" value="1.8" />

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

</capabilities>

</browser>

<!-- Mozilla/5.0 (Windows; U; Windows NT 5.1; sv-SE; rv:1.9.1) Gecko/20090624 Firefox/3.5 -->

<browser id="Firefox3" parentID="Firefox3Plus">

<identification>

<capability name="majorversion" match="^3$" />

</identification>

<capabilities>

</capabilities>

</browser>

<!-- Mozilla/5.0 (Windows; U; Windows NT 5.1; sv-SE; rv:1.9.1) Gecko/20090624 Firefox/3.5 -->

<browser id="Firefox35" parentID="Firefox3">

<identification>

<capability name="minorversion" match="^[5-9]" />

</identification>

<capabilities>

</capabilities>

</browser>

</browsers>

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