HttpContext.Current在Application_PreSendRequestHeaders中为null

我在启动我的应用程序时收到空引用异常。这里是HttpContext.Current null。HttpContext.Current在Application_PreSendRequestHeaders中为null

protected void Application_PreSendRequestHeaders() 
{ 
    HttpResponse response = HttpContext.Current.Response; 
    if (response.Filter is GZipStream && response.Headers["Content-encoding"] != "gzip") 
    { 
     response.AppendHeader("Content-encoding", "gzip"); 
    } 
    else if (response.Filter is DeflateStream && response.Headers["Content-encoding"] != "deflate") 
    { 
     response.AppendHeader("Content-encoding", "deflate"); 
    } 
}

为什么是这样，我怎么能得到这个工作？

来源

2013-06-21 Djave

您是否最近从VS 2008升级到VS 2012？

我想你仍然需要升级web.config文件。

1）取出在<configSections>本节：）

<sectionGroup name="system.web.extensions" type="System.Web.Configuration.SystemWebExtensionsSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"> 
    <sectionGroup name="scripting" type="System.Web.Configuration.ScriptingSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"> 
    <section name="scriptResourceHandler" type="System.Web.Configuration.ScriptingScriptResourceHandlerSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication"/> 
    <sectionGroup name="webServices" type="System.Web.Configuration.ScriptingWebServicesSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"> 
     <section name="jsonSerialization" type="System.Web.Configuration.ScriptingJsonSerializationSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="Everywhere"/> 
     <section name="profileService" type="System.Web.Configuration.ScriptingProfileServiceSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication"/> 
     <section name="authenticationService" type="System.Web.Configuration.ScriptingAuthenticationServiceSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication"/> 
     <section name="roleService" type="System.Web.Configuration.ScriptingRoleServiceSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication"/> 
    </sectionGroup> 
    </sectionGroup> 
</sectionGroup>

2在<compilation>标签附加属性targetFramework="4.5"：

<compilation debug="true" targetFramework="4.5">

3）添加以下各节中<system.web>：

<membership> 
    <providers> 
    <clear /> 
    <add name="AspNetSqlMembershipProvider" type="System.Web.Security.SqlMembershipProvider, System.Web, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" connectionStringName="ApplicationServices" enablePasswordRetrieval="false" enablePasswordReset="true" requiresQuestionAndAnswer="false" requiresUniqueEmail="false" passwordFormat="Hashed" maxInvalidPasswordAttempts="5" minRequiredPasswordLength="6" minRequiredNonalphanumericCharacters="0" passwordAttemptWindow="10" passwordStrengthRegularExpression="" applicationName="/" /> 
    </providers> 
</membership> 
<profile> 
    <providers> 
    <clear /> 
    <add name="AspNetSqlProfileProvider" type="System.Web.Profile.SqlProfileProvider, System.Web, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" connectionStringName="ApplicationServices" applicationName="/" /> 
    </providers> 
</profile> 
<roleManager enabled="false"> 
    <providers> 
    <clear /> 
    <add connectionStringName="ApplicationServices" applicationName="/" name="AspNetSqlRoleProvider" type="System.Web.Security.SqlRoleProvider, System.Web, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" /> 
    <add applicationName="/" name="AspNetWindowsTokenRoleProvider" type="System.Web.Security.WindowsTokenRoleProvider, System.Web, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" /> 
    </providers> 
</roleManager>

4）删除<httpHandlers>和<httpModules>部分从<system.web>部分。

5）删除<system.codedom>部分。

来源

2013-06-27 10:50:27

你能解释一下这是为什么吗？ – Josh

我不知道为什么，但是当我升级到VS 2012并没有更新web.config时，我遇到了与Djave相同的问题。 –

将应用程序池的设置“管理流水线模式”从经典更改为集成后，此问题已得到解决。

来源

2017-05-12 13:17:25

HttpContext.Current在Application_PreSendRequestHeaders中为null

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