WCF不反序列化JSON输入

问题描述

我有一个WCF服务，定义如下:

I have a WCF service defined as follows:

Imports System.ServiceModel
Imports System.ServiceModel.Web

<ServiceContract()>
Public Interface ILayoutService

  <OperationContract()>
  <WebInvoke(Method:="POST",
             BodyStyle:=WebMessageBodyStyle.WrappedRequest,
             RequestFormat:=WebMessageFormat.Json,
             ResponseFormat:=WebMessageFormat.Json)>
  Sub SaveLayout(ByVal layout As Layout)

  <OperationContract()>
  Function GetLayout() As Layout

End Interface

Layout类定义为:

Imports System.Runtime.Serialization

<DataContract()>
Public Class Layout

  <DataMember()>
  Public Property Columns As New List(Of ContentColumn)

End Class

<DataContract()>
Public Class ContentColumn
  <DataMember()>
  Public Property Name As String = "Column Name"

  <DataMember()>
  Public Property Position As Integer

  <DataMember()>
  Public Property Modules As New List(Of ContentModule)

End Class

<DataContract()>
Public Class ContentModule

  <DataMember()>
  Public Property Name As String = "Module Name"

  <DataMember()>
  Public Property Position As Integer

End Class

ILayoutService的实现如下:

The implementation of ILayoutService is as follows:

Imports System.ServiceModel.Activation
Imports System.Web.Script.Serialization

<AspNetCompatibilityRequirements(RequirementsMode:=AspNetCompatibilityRequirementsMode.Required)>
Public Class LayoutService
  Implements ILayoutService

  Public Sub SaveLayout(ByVal layout As Layout) Implements ILayoutService.SaveLayout
    Dim l As New Layout
    Dim left, center, right As New ContentColumn

    left.Name = "Left Column"
    left.Position = 0
    center.Name = "Center Column"
    center.Position = 1
    right.Name = "Right Column"
    right.Position = 2

    Dim topLeft, centerLeft, bottomLeft, topCenter, centerCenter, bottomCenter, topRight, centerRight, bottomRight As New ContentModule

    topLeft.Name = "Top Left"
    topLeft.Position = 0
    centerLeft.Name = "Center Left"
    centerLeft.Position = 1
    bottomLeft.Name = "Bottom Left"
    bottomLeft.Position = 2

    topCenter.Name = "Top Center"
    topLeft.Position = 0
    centerCenter.Name = "Center Center"
    centerCenter.Position = 1
    bottomCenter.Name = "Bottom Center"
    bottomCenter.Position = 2

    topRight.Name = "Top Right"
    topRight.Position = 0
    centerRight.Name = "Center Right"
    centerRight.Position = 1
    bottomRight.Name = "Bottom Right"
    bottomRight.Position = 2

    left.Modules.Add(topLeft)
    left.Modules.Add(centerLeft)
    left.Modules.Add(bottomLeft)

    center.Modules.Add(topCenter)
    center.Modules.Add(centerCenter)
    center.Modules.Add(bottomCenter)

    right.Modules.Add(topRight)
    right.Modules.Add(centerRight)
    right.Modules.Add(bottomRight)

    l.Columns.Add(left)
    l.Columns.Add(center)
    l.Columns.Add(right)

    Dim json As New JsonResult
    json.Data = l
    Dim serializer As New JavaScriptSerializer
    Dim output = serializer.Serialize(json.Data)
  End Sub

  Public Function GetLayout() As Layout Implements ILayoutService.GetLayout
    Dim l As New Layout
    Dim c As New ContentColumn
    Dim m As New ContentModule
    c.Modules.Add(m)
    l.Columns.Add(c)
    Return l
  End Function
End Class

我实现了SaveLayout()，所以我可以获取将被(反)序列化的原义JSON.我正在用它来测试通过jQuery调用此服务:

I implemented SaveLayout() so I can get the literal JSON that would be (de)serialized. I'm using that to test invoking this service via jQuery:

$(document).ready(function () {

  $("#saveLayout").click(function () {

    var layout = buildLayout();
    var jsonLayout = $.toJSON(layout);

    $.ajax({
      type: "POST",
      contentType: "application/json; charset=utf-8",
      dataType: "json",
      url: "/Services/LayoutService.svc/SaveLayout",
      data: jsonLayout,
      dataType: "json",
      success: function (result) {
        alert(result.d.Columns[0].Name);
      },
      error: function (xhr, ajaxOptions, thrownError) {
        var jsonFault = JSON.parse(xhr.responseText);
        alert(jsonFault.Message);
      }
    });
    return false;
  });

});

function buildLayout() {
  var layout = { "Columns": [
    { "Name": "Left Column", "Position": 0, "Modules": [
      { "Name": "Top Left", "Position": 0 },
      { "Name": "Center Left", "Position": 1 },
      { "Name": "Bottom Left", "Position": 2}]
    },
    { "Name": "Center Column", "Position": 1, "Modules": [
      { "Name": "Top Center", "Position": 0 },
      { "Name": "Center Center", "Position": 1 },
      { "Name": "Bottom Center", "Position": 2}]
    },
    { "Name": "Right Column", "Position": 2, "Modules": [
      { "Name": "Top Right", "Position": 0 },
      { "Name": "Center Right", "Position": 1 },
      { "Name": "Bottom Right", "Position": 2}]
    }]
  };

  return layout;
}

buildLayout()返回的布局是VB代码中serialize()调用返回的确切JSON.由于某些原因，当我调用Web服务时，SaveLayout()中的输入参数layout为Nothing.反序列化一定会失败.知道为什么吗?

The layout returned by buildLayout() is the exact JSON returned by the serialize() call in the VB code. For some reason, when I invoke the web service, the input parameter layout in SaveLayout() is Nothing. Something must be failing on deserialization. Any idea why?

推荐答案

仅凭您提供的详细信息很难分辨.

it's hard to tell from just the detail you've provided.

这是我的建议:

• 在服务端启用跟踪，生成跟踪日志，并使用SvcTraceViewer进行分析.为此，请按照有关使用服务跟踪查看器的MSDN文章.

打开调试异常.这是通过上载includeExceptionDetailInFaults来完成的，您可以按照此处的说明进行操作.

Turn on debug exceptions. This is done by turning in includeExceptionDetailInFaults, which you can do by following the instructions here.

使用提琴手来监视客户端和服务端的有线通信量.

Use Fiddler to monitor the wire traffic on both the client side and the service side.

通常，一旦您执行了此操作，您就应该在服务端获取更多有关时髦问题的信息，并且可以很快地诊断出该问题.尝试一下，请举报！ :)

Generally, once you do this, you should plenty of more info on what's going funky at the service side and can diagnose the issue pretty quickly. Try it, and please report back! :)

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