Question

我正在尝试使用C＃实现WebAPI 2。在我的开发设置中一切正常，但是当我将它部署到实时服务器时，DELETE函数会导致错误。

我已将功能剥离到基础，但仍会导致错误。所有其他API调用继续正常工作。

代码是：

    [HttpDelete]
    public string Delete(int id)
    {
        return "delete";
    }

错误是：

<div id="content">
<div class="content-container"><fieldset>
<h2>500 - Internal server error.</h2>
<h3>There is a problem with the resource you are looking for, and it cannot be displayed.</h3>
</fieldset></div>
</div>

<Error>
<Message>An error has occurred.</Message>
<ExceptionMessage>
Object reference not set to an instance of an object.
</ExceptionMessage>
<ExceptionType>System.NullReferenceException</ExceptionType>
<StackTrace>
at System.Web.Http.ApiController.       <InvokeActionWithExceptionFilters>d__1.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Web.Http.Dispatcher.HttpControllerDispatcher.    <SendAsync>d__0.MoveNext()

我的web.config如下：

<?xml version="1.0" encoding="utf-8"?>
<!--
For more information on how to configure your ASP.NET application, please  visit
http://go.microsoft.com/fwlink/?LinkId=301879
 -->
<configuration>
<connectionStrings>
 <add name="PlaneLoggerEntities" connectionString="metadata=res://*/Models.Model.csdl|res://*/Models.Model.ssdl|res://*/Models.Model.msl;provider=System.Data.SqlClient;provider connection string=&quot;data source=.\MSSQLSERVER2012;initial catalog=PlaneLogger_Dev;integrated security=True;pooling=False;multipleactiveresultsets=True;App=EntityFramework&quot;" providerName="System.Data.EntityClient" />
 <add name="PlaneRegistrationsEntities" connectionString="metadata=res://*/Models.Aircraft.csdl|res://*/Models.Aircraft.ssdl|res://*/Models.Aircraft.msl;provider=System.Data.SqlClient;provider connection string=&quot;data source=.\MSSQLSERVER2012;initial catalog=PlaneRegistrations;integrated security=True;multipleactiveresultsets=True;App=EntityFramework&quot;" providerName="System.Data.EntityClient" />
 </connectionStrings>
 <appSettings>
 <add key="webpages:Version" value="3.0.0.0" />
 <add key="webpages:Enabled" value="false" />
 <add key="ClientValidationEnabled" value="true" />
 <add key="UnobtrusiveJavaScriptEnabled" value="true" />
</appSettings>
<system.web>
<compilation targetFramework="4.5" />
<httpRuntime targetFramework="4.5" />
</system.web>
<system.webServer>

 <modules>
  <add name="BasicAuthHttpModule" type="PlaneLogger.API.Modules.BasicAuthHttpModule" />
  <remove name="WebDAVModule"/>
</modules>
<handlers>
  <remove name="ExtensionlessUrlHandler-Integrated-4.0" />
  <remove name="OPTIONSVerbHandler" />
  <remove name="TRACEVerbHandler" />
  <add name="ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="GET,HEAD,POST,DEBUG,PUT,DELETE,PATCH,OPTIONS" type="System.Web.Handlers.TransferRequestHandler" preCondition="integratedMode,runtimeVersionv4.0" />
</handlers>
</system.webServer>
<runtime>
 <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
  <dependentAssembly>
    <assemblyIdentity name="System.Web.Helpers" publicKeyToken="31bf3856ad364e35" />
    <bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
  </dependentAssembly>
  <dependentAssembly>
    <assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35" />
    <bindingRedirect oldVersion="1.0.0.0-5.0.0.0" newVersion="5.0.0.0" />
  </dependentAssembly>
  <dependentAssembly>
    <assemblyIdentity name="System.Web.Optimization" publicKeyToken="31bf3856ad364e35" />
    <bindingRedirect oldVersion="1.0.0.0-1.1.0.0" newVersion="1.1.0.0" />
  </dependentAssembly>
  <dependentAssembly>
    <assemblyIdentity name="System.Web.WebPages" publicKeyToken="31bf3856ad364e35" />
    <bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
  </dependentAssembly>
  <dependentAssembly>
    <assemblyIdentity name="WebGrease" publicKeyToken="31bf3856ad364e35" />
    <bindingRedirect oldVersion="1.0.0.0-1.5.2.14234" newVersion="1.5.2.14234" />
    </dependentAssembly>
  </assemblyBinding>
  </runtime>
 </configuration>

请帮助，现在正在做我的坚果！

Answer 1

交叉检查如下：你真的把int值作为id传递。 2.删除方法的控制器是否启用了Cors策略。 3.您是否在正文中发送任何数据对象，如果是，则使用相应的类检查其正确性。 4.使用（[FromRoute] int Id）作为参数。

我希望它对你有用。

Answer 2

经过一番挖掘，我找到了答案。

基本上，问题是由于IIS如何处理模块和请求处理程序。默认情况下，WebDAV将配置为侦听PUT和DELETE请求。通常，WebDAV将在您的服务器上禁用，但是这不会删除绑定，任何PUT和DELETE请求仍将传递给WebDAV，WebDAV会因为它被禁用而拒绝它们。

您需要通过Web配置删除WebDAV，如下所示：

<modules>
  <remove name="WebDAVModule"/>
</modules>
<handlers>
  <remove name="WebDAV" />
</handlers>

您需要这两个条目才能正常工作。我的web.config中只有删除模块条目。

WebAPI删除导致500 /未找到对象

2 个答案: