在返回JSON的MVC5 APICONTROLLER中设置响应代码

Question

我使用mvc5：

有类似的东西

Namespace Controllers
Public Class WorkflowsController Inherits ApiController
    <HttpPost>
    <ActionName("SaveComment")>
    Public Function PostComment(id As String, Optional comment As String = "")
        Try
            Dim status As ApiResponse = SomeClass.AddComment(id, comment)
            Return Me.Json(status)
        Catch ex As Exception
            Return Me.Json(New ApiResponse With {.ErrorMessage = ex.Message})
        End Try
    End Function    
End Class
End Namespace

它正常工作，如您所见，它在正常和错误条件下都将JSON对象返回到浏览器。如果例外，我如何将响应代码设置为500，以及将errormessage返回为JSON对象？

Answer 1

您可以在返回jsonresult之前执行httpstatuscoderesult：

    Try
        Dim status As ApiResponse = SomeClass.AddComment(id, comment)
        Return Me.Json(status)
    Catch ex As Exception
        (New HttpStatusCodeResult(500)).ExecuteResult(ControllerContext)
        Return Me.Json(New ApiResponse With {.ErrorMessage = ex.Message})
    End Try