CollectionViewSource 将源绑定到 Web 服务(使用 WCF RIA 服务和 LINQ) - Silverlight [英] CollectionViewSource bind source to webservice (using WCF RIA services and LINQ) - Silverlight

问题描述

我有一个小问题，可能很愚蠢，但我想不通..无论如何，我想要做的就是将我的 CollectionViewSource.Source 绑定到我在 Silverlight 4 中使用 WCF RIA 服务生成的查询.

I have a small problem, probably stupid but I can't figure this out.. Anyways all I'm trying to do is bind my CollectionViewSource.Source to my resulting query in Silverlight 4 with WCF RIA services.

这是我的 XAML :

This is my XAML :

<UserControl.Resources>
    <CollectionViewSource x:Name="cvsServiceTypes" />
</UserControl.Resources>
<Grid>
    <ComboBox Height="23" HorizontalAlignment="Left" ItemsSource="cvsServiceTypes" DisplayMemberPath="Type" SelectedValuePath="IDServicesType" Margin="154,51,0,0" Name="cbServiceType" VerticalAlignment="Top" Width="120" SelectedValue="{Binding fkservicetype, Mode=TwoWay}" />
</Grid>

还有我的代码隐藏:

  public Services()
  {
      InitializeComponent();

      webService.GetServiceTypesCompleted += (s, e) => { cvsServiceTypes.Source = e.Result; };
      webService.GetServiceTypesAsync();
   }

但它似乎不起作用......我做错了什么?

But it doesn't seem to work... what am I doing wrong?

非常感谢！

推荐答案

我希望你不介意我忽略 web 服务调用部分 - 看起来你正在努力将你的项目绑定到 ComboBox，所以就是我要解决的部分.

I hope you don't mind if I ignore the web service call part - it looks like you're struggling with binding your items to the ComboBox, so that's the part I'll address.

您需要执行以下操作:

1. 创建一个 ObservableCollection 属性来包含您的项目.
2. 将 CollectionViewSource.Source 绑定到 ObservableCollection.
3. 将 ComboBox.ItemsSource 绑定到 CollectionViewSource.
4. 在您的 UserControl 上设置 DataContext.

这是一个例子:

<UserControl ...>
    <StackPanel>
        <StackPanel.Resources>
            <CollectionViewSource x:Key="cvs" Source="{Binding Path=Items}"></CollectionViewSource>
        </StackPanel.Resources>
        <ComboBox ItemsSource="{Binding Source={StaticResource ResourceKey=cvs}}" />
        <ComboBox ItemsSource="{Binding Source={StaticResource ResourceKey=cvs}}" />
        <ComboBox ItemsSource="{Binding Source={StaticResource ResourceKey=cvs}}" />
    </StackPanel>
</UserControl>

代码:

public partial class UserControl1 : UserControl
{
    public UserControl1()
    {
        InitializeComponent();
        this.DataContext = this;
        _items.Add("a");
        _items.Add("b");
    }

    private ObservableCollection<string> _items = new ObservableCollection<string>();
    public ObservableCollection<string> Items
    {
        get { return _items; }
        set { _items = value; }
    }
}

当您的网络服务调用完成时，您可以将项目放入集合中:

You can put items into the collection when your web service call completes like this:

webService.GetServiceTypesCompleted += (s, e) => 
{
    foreach (string s in e.result)
    {
        _items.Add(s);
    }
};

这篇关于CollectionViewSource 将源绑定到 Web 服务(使用 WCF RIA 服务和 LINQ) - Silverlight的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！