.NET4.0 __doPostBack未定义

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：

 

 

   < 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>