内容协商期间HttpControllerContext.Configuration有时为null

Question

我们正在设置ASP.NET 4.6.2 Web Api主机，并注意到某些请求由于以下错误而失败：

HttpControllerContext.Configuration must not be null.

我一直无法重现问题，想问问是否有人可以引导我朝正确的方向前进？

这是堆栈跟踪：

[0] System.InvalidOperationException "HttpControllerContext.Configuration must not be null."
   at System.Web.Http.Results.NegotiatedContentResult`1.ApiControllerDependencyProvider.EnsureResolved()
   at System.Web.Http.Results.NegotiatedContentResult`1.ApiControllerDependencyProvider.get_ContentNegotiator()
   at System.Web.Http.Results.BadRequestErrorMessageResult.Execute()
   at System.Web.Http.Results.BadRequestErrorMessageResult.ExecuteAsync(CancellationToken cancellationToken)
   at System.Web.Http.Controllers.ApiControllerActionInvoker.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.d__15.MoveNext()

Answer 1

将标头添加到BadRequestErrorMessageResult时，我的测试中发生了类似的错误。该修补程序仅用于初始化控制器的配置。 ...然后初始化请求。

所以我的测试设置最终看起来像

public class FooControllerTest
{
    private FooController _sut;

    [Setup]
    public void Setup()
    {
        _sut = new FooController();
        _sut.Configuration = new System.Web.Http.HttpConfiguration();
        _sut.Request = new System.Net.Http.HttpRequestMessage();
    }
}

希望有帮助。