从服务器到客户端的 Ria 数据损坏

Question

我在 Silverlight 4 Ria 项目的服务器端有一个 Linq 查询，它根据时间段（月）返回许多不同的项目。

我遇到的问题是，当客户端回调触发时，数据已损坏，并且从服务器返回的所有项目都是集合中最后一个项目的重复项。

服务器调用

Public Function GetBusinessHeadCountHistory(ByVal businessUnit As String) As IEnumerable(Of EngineeringHeadCountBusinessHistory)
        Return From t In ObjectContext.tblTimes
                     Join h In ObjectContext.tblEngineeringDashboard_CADMachinesCounts On t.ID Equals h.TimeID
                     Join b In ObjectContext.tblEngineeringDashboard_Business On h.BusinessID Equals b.ID
                           Where b.BusinessUnit = businessUnit
                           Order By t.Period
                           Select New EngineeringHeadCountBusinessHistory With {.Month = t.Period, .BusinessUnit = b.BusinessUnit, .HeadCount = h.Count}
End Function

客户端回调

Public Property EngineeringBusinessHistoryCount As ReadOnlyObservableCollection(Of EngineeringHeadCountBusinessHistory)
    Get
        Return _engineeringBusinessHistoryCount
    End Get
    Set(ByVal value As ReadOnlyObservableCollection(Of EngineeringHeadCountBusinessHistory))
        _engineeringBusinessHistoryCount = value
        IsBusinessCountBusy = False
        RaisePropertyChanged("ChildReportTitle")
        RaisePropertyChanged("EngineeringBusinessHistoryCount")
    End Set
End Property

我已经确认来自服务器和 LinqPad 中的 Linq 查询是正确的。

有什么想法吗？

编辑：Fiddler RAW 回复

HTTP/1.1 200 OK
Cache-Control: no-cache
Pragma: no-cache
Content-Length: 1738
Content-Type: application/msbin1
Expires: -1
Server: Microsoft-IIS/6.0
MicrosoftOfficeWebServer: 5.0_Pub
X-Powered-By: ASP.NET
X-AspNet-Version: 4.0.30319
Date: Thu, 30 Jun 2011 11:08:47 GMT

@#GetBusinessHeadCountHistoryResponsehttp://tempuri.org/@!GetBusinessHeadCountHistoryResult aDomainServices i)http://www.w3.org/2001/XMLSchema-instance^
TotalCount�^
RootResults b<http://schemas.datacontract.org/2004/07/EngineeringDashboard_#EngineeringHeadCountBusinessHistory_BusinessUnit�
skid-steer_ HeadCount�_Month����~�X�_#EngineeringHeadCountBusinessHistory_BusinessUnit�
skid-steer_ HeadCount�_Month��@���p�_#EngineeringHeadCountBusinessHistory_BusinessUnit�
skid-steer_ HeadCount�_Month��@DE��_#EngineeringHeadCountBusinessHistory_BusinessUnit�
skid-steer_ HeadCount�_Month���hE��_#EngineeringHeadCountBusinessHistory_BusinessUnit�
skid-steer_ HeadCount�_Month���w`ض�_#EngineeringHeadCountBusinessHistory_BusinessUnit�
skid-steer_ HeadCount�_Month��@E�4��_#EngineeringHeadCountBusinessHistory_BusinessUnit�
skid-steer_ HeadCount�_Month����{���_#EngineeringHeadCountBusinessHistory_BusinessUnit�
skid-steer_ HeadCount� _Month���x�#��_#EngineeringHeadCountBusinessHistory_BusinessUnit�
skid-steer_ HeadCount� _Month��@F��_#EngineeringHeadCountBusinessHistory_BusinessUnit�
skid-steer_ HeadCount� _Month�����/�_#EngineeringHeadCountBusinessHistory_BusinessUnit�
skid-steer_ HeadCount�"_Month���y�nG�_#EngineeringHeadCountBusinessHistory_BusinessUnit�
skid-steer_ HeadCount�"_Month�����_�_#EngineeringHeadCountBusinessHistory_BusinessUnit�
skid-steer_ HeadCount�"_Month�����]w�_#EngineeringHeadCountBusinessHistory_BusinessUnit�
skid-steer_ HeadCount�$_Month���z���_#EngineeringHeadCountBusinessHistory_BusinessUnit�
skid-steer_ HeadCount�$_Month���
����_#EngineeringHeadCountBusinessHistory_BusinessUnit�
skid-steer_ HeadCount�$_Month��@����

Phil

Answer 1

首先，使用 Fiddler 检查原始服务器响应是否正确。

Answer 2

问题在于 POCO 类 Key 注释位于非唯一字段上。我已将其更改为独特的 Month 属性，现在它按预期工作。

但奇怪的错误...

Imports System.ComponentModel.DataAnnotations
Imports System.Runtime.Serialization

Public Class EngineeringHeadBUHistory

    '<Key()>
    '<DataMember()> _
    'Property BusinessUnit As String
    <Key()>
    <DataMember()>
    Property Month As Date
    <DataMember()> _
    Property HeadCount As Integer

End Class