请帮助我检查Silverlight for Windows Embedded中有关数据绑定的代码

很抱歉给你读我的问题带来了很多麻烦，因为我是中国人，我的英语很差，但这个问题困扰了我很长时间。

当我构建一个关于数据绑定的测试代码时，就会遇到麻烦。

我创建了第二个线程，它有一个周期来生成数据源，然后该线程调用MainPage中的一个方法来填充ListBoxItem。

这个方法有两种方法。一个使用Databinding，另一个使用ListBoxItem的SetContent（）。

结果是，Databinding运行大约几十个周期，然后停止，但SetContent（）可以运行到结束。

以下是我的全部基于代码的Windows嵌入式Silverlight工具，并在CEPC 中运行

主页.XAML

xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
x:Class="test6.MainPage"
Width="640" Height="480">
<Grid x:Name="LayoutRoot" Background="White">
    <Button x:Name="Button1" Height="43" HorizontalAlignment="Right" Margin="0,111,83,0" VerticalAlignment="Top" Width="117" Content="Button"/>
    <ListBoxItem x:Name="ListBoxItem1" HorizontalAlignment="Left" Margin="84,111,0,0" Width="138" Content="{Binding L1}" Height="52" VerticalAlignment="Top" Background="#CEFFA3A3" FontSize="16"/>
    <ListBoxItem x:Name="ListBoxItem2" Height="43" HorizontalAlignment="Left" Margin="84,187,0,0" VerticalAlignment="Top" Width="138" Content="{Binding L2}" Background="#6971FF6E" FontSize="16"/>
</Grid>

首先添加

pWindowParameters->AllowsMultipleThreadAccess = true;

在App:：GetWindowParameters中，如果没有，SetContent（）可能会像DataBinding一样出现。

在MainPage.h 中声明

HRESULT MainPage::UpdateData();

和

DWORD WINAPI Thread2 (PVOID pArg);

DataValue.h:

#pragma once
#include <oleauto.h>
#include "XRCollection.h"
#include "XRPropertyBag.h"
class _declspec(uuid("{9C0158BE-D467-4284-A51A-327DEFE935C5}")) DataValue : public TPropertyBag<DataValue>
{
protected:
    // Protected, create by using TPropertyBag::CreateInstance to create an instance, then call Initialize();
    // this will CreateInstance will use XRObject to implement IUnknown, which saves us work.
    DataValue() {};
public:
    HRESULT Initialize(float l1,float l2)
    {
        HRESULT hr = InitializeProperties();
        m_L1 =l1;
        m_L2 =l2;
        return hr;
    }
     TBoundProperty<float> m_L1;
     TBoundProperty<float> m_L2;
    // Mapping TBoundProperty and property names.
    HRESULT InitializeProperties()
    {
        HRESULT hr = S_OK;
        hr = BeginRegisterProperties();
        if (FAILED(hr))
            return hr;   
        hr = RegisterBoundProperty(L"L1", m_L1);
        if (FAILED(hr))
            return hr;
        hr = RegisterBoundProperty(L"L2", m_L2);
        if (FAILED(hr))
            return hr;
        hr = EndRegisterProperties();
        return hr;
    }
};

在MainPange.cpp中：

#include "stdafx.h"
#include "test6Generated.h"
#include "MainPage.h"
#include "App.h"
#include "resource.h"
#include "DataValue.h"
#include "oleauto.h"
#include "XRPropertyBag.h"
static XRPtr<DataValue> pDataValue;
static XRValue xrvalueNew;
static float i=0;
// ============================================================================
//  OnLoaded
//
//  Description: Calls InitializeComponent to bind member variables to named
//               elements, and attach event handlers specified in XAML
//
//  Parameters:  pRoot - The root dependency object.
// ============================================================================
HRESULT MainPage::OnLoaded(__in IXRDependencyObject* pRoot)
{
    UNREFERENCED_PARAMETER(pRoot);
    HRESULT hr = InitializeComponent();
    // Add calls to FindName or Add___EventHandler() methods after this comment.
    DataValue::CreateInstance(&pDataValue);
    pDataValue->Initialize(1,2);
    XRValue DataContext(pDataValue);
    m_pListBoxItem1->SetDataContext(&DataContext);
    //m_pListBoxItem2->SetDataContext(&DataContext);
    HANDLE hThread1;
    hThread1=CreateThread(NULL,0,Thread2,this,0,NULL);
    CloseHandle(hThread1);
    return hr;
} // OnLoaded
DWORD WINAPI Thread2 (PVOID pArg)
{   
    HRESULT hr = E_NOTIMPL;
    MainPage* pMainPage = (MainPage *)pArg;
    while(i<2000)   
    {
        ++i;
            Sleep(200);
    pMainPage->UpdateData();
        }
    return 0;
}
HRESULT MainPage::UpdateData() 
{ 
    xrvalueNew.SetValue(i); 
       XRAutoCriticalSection csObject; 
       EnterCriticalSection(&csObject); 
       //pItemValue->SetValue(L"ID",&xrvalueNew);
       pDataValue->m_L1=i;
       m_pListBoxItem2->SetContent(&xrvalueNew);
       LeaveCriticalSection(&csObject);
              return S_OK; 
}
#pragma region GeneratedCode
// ============================================================================
//  WARNING: DO NOT EDIT THIS ALWAYS-GENERATED CODE
// ============================================================================
HRESULT MainPage::InitializeComponent()
{
    HRESULT hr = E_FAIL;
    FindName(L"LayoutRoot", &m_pLayoutRoot);
    FindName(L"Button1", &m_pButton1);
    FindName(L"ListBoxItem1", &m_pListBoxItem1);
    FindName(L"ListBoxItem2", &m_pListBoxItem2);
    if (m_pLayoutRoot &&
        m_pButton1 &&
        m_pListBoxItem1 &&
        m_pListBoxItem2
       )
    {
        hr = S_OK;
    }
    return hr;
}
// ============================================================================
//  WARNING: DO NOT EDIT THIS ALWAYS-GENERATED CODE
// ============================================================================
#pragma endregion GeneratedCode

结果是这样的：

http://social.msdn.microsoft.com/Forums/nl-BE/winembnatapp/thread/52e0fd82-e81b-448f-a518-1a8bef5dd8e4

如果我想使用DataBinding，具体的方法是什么？我想建立一个HMI，它可能有数百个价值，每500毫秒可能会刷新几十个项目。

SetContent（）是一种在生产环境中使用的可行方法吗？

// Don't do this
//pDataValue->m_L1=i;
// Do this instead
pDataValue->SetValue(L"L1", &i)