WPF：如何将对象数据绑定到元素并通过代码应用数据模板？

Question

我创建了一个类LeagueMatch。

public class LeagueMatch
{
    public string Home
    {
        get { return home; }
        set { home = value; }
    }

    public string Visitor
    {
        get { return visitor; }
        set { visitor = value; }
    }

    private string home;
    private string visitor;

    public LeagueMatch()
    {
    }
}

接下来，我在 XAML 中为 LeagueMatch 对象定义了一个数据模板资源：

<DataTemplate x:Key="MatchTemplate" DataType="{x:Type entities:LeagueMatch}">
    <Grid Name="MatchGrid" Width="140" Height="50" Margin="5">
        <Grid.RowDefinitions>
            <RowDefinition Height="*" />
            <RowDefinition Height="*" />
            <RowDefinition Height="*" />
        </Grid.RowDefinitions>
        <TextBlock Grid.Row="0" Text="{Binding Home}" />
        <TextBlock Grid.Row="1" Text="- vs -" />
        <TextBlock Grid.Row="2" Text="{Binding Visitor}" />
    </Grid>    
</DataTemplate>

在 XAML 代码隐藏中，我想创建一个 ContentPresenter 对象并将其数据绑定设置为先前初始化的LeagueMatch对象并应用定义的数据模板。那应该怎么做呢？谢谢。

解决方案

LeagueMatch match = new LeagueMatch("A team", "B team");

ContentPresenter contentPresenter = new ContentPresenter();
contentPresenter.ContentTemplate = this.FindResource("MatchTemplate") as DataTemplate;
Binding binding = new Binding();
binding.Source = match;
contentPresenter.SetBinding(ContentPresenter.ContentProperty, binding);

matchSlot.Children.Clear();
matchSlot.Children.Add(contentPresenter);

Answer 1

<ContentPresenter ContentTemplate="{StaticResource yourTemplate}" 
                   DataContext="{Binding Match}"/>

在代码隐藏中：

ContentPresenter c = new ContentPresenter();
c.ContentTemplate = FindResource("yourTemplate");
Binding b = new Binding();
b.Path = "Match"; // if the object is a property on someObject, otherwise leave it out.
b.Source = someObject;

c.SetBinding(ContentPresenter.ContentProperty, b);

实现 INotifyPropertyChanged

public class Sample : INotifyPropertyChanged
{
  private string sampleField = "";

  public string SampleProperty
  {
    get { return sampleField; }
    set
    {
       sampleField = value;
       RaisePropertyChanged("SampleProperty");
    }
  }

  #region INotifyPropertyChanged

  public event PropertyChangedEventHandler PropertyChanged;

  private void RaisePropertyChanged(string property)
  {
     var handler = PropertyChanged;
     if(handler != null)
        handler(this, new PropertyChangedEventArgs(property));
  }
}

请务必通过分配给属性来仅更改属性，以便执行事件。绑定引擎正在侦听这些事件以刷新绑定。

Answer 2

您需要绑定到 ContentPresenter 上的 Content 属性，而不是 DataContext，才能将模板应用到您的数据：

contentPresenter.SetBinding(ContentPresenter.ContentProperty, binding);