CustomControl上的綁定問題

Question

我已經在WPF上編寫了一個CustomControl，它只是一個帶有ContentPresenter和Button的ContentControl。

這裏是控制模板（位於主題/ Generic.xaml）：

<ControlTemplate TargetType="{x:Type local:TestControl}"> 
    <StackPanel Background="{TemplateBinding Background}"> 
     <ContentPresenter Content="{TemplateBinding Content}" /> 
     <Button Content="Next" IsEnabled="{TemplateBinding IsNextButtonEnabled}" /> 
    </StackPanel> 
</ControlTemplate> 

這裏是控制代碼（TestControl.cs）：

public class TestControl : ContentControl 
{ 
    /// <summary> 
    /// Identifies the IsNextButtonEnabled dependency property 
    /// </summary> 
    public readonly static DependencyProperty IsNextButtonEnabledProperty = DependencyProperty.Register(
     "IsNextButtonEnabled", typeof(bool), typeof(TestControl), 
     new PropertyMetadata(true) 
    ); 

    static TestControl() 
    { 
     DefaultStyleKeyProperty.OverrideMetadata(typeof(TestControl), new FrameworkPropertyMetadata(typeof(TestControl))); 
    } 

    /// <summary> 
    /// Gets or sets the value indicating if the Next button of the control is enabled 
    /// </summary> 
    [BindableAttribute(true)] 
    public bool IsNextButtonEnabled 
    { 
     get 
     { 
      return (bool)GetValue(IsNextButtonEnabledProperty); 
     } 
     set 
     { 
      SetValue(IsNextButtonEnabledProperty, value); 
     } 
    } 
} 

---

我想將TestControl的IsNextButtonEnabled的值綁定到TestControl本身的Content內部的另一個控件（例如CheckBox）。

所以我做到了，它工作（當我選中或取消選中該複選框，按鈕啓用或禁用正確本身）：

MainWindow.xaml

<Window x:Class="WpfApplication2.MainWindow" 
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
    xmlns:local="clr-namespace:WpfApplication2" 
    Title="MainWindow" Height="350" Width="525"> 
    <Grid> 
     <local:TestControl IsNextButtonEnabled="{Binding ElementName=cb, Path=IsChecked}"> 
      <CheckBox Name="cb" IsChecked="True" /> 
     </local:TestControl> 
    </Grid> 
</Window> 

但是我想做的是在獨立的xaml文件中聲明我的TestControl。所以，我沒有這一點，但它不工作：在執行，在輸出

<local:TestControl x:Class="WpfApplication2.MyTestControl" 
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
        xmlns:local="clr-namespace:WpfApplication2" 
        IsNextButtonEnabled="{Binding ElementName=cb, Path=IsChecked}"> 
    <Grid> 
     <CheckBox Name="cb" IsChecked="True" /> 
    </Grid> 
</local:TestControl> 

：

MainWindow.xaml

<Window x:Class="WpfApplication2.MainWindow" 
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
    xmlns:local="clr-namespace:WpfApplication2" 
    Title="MainWindow" Height="350" Width="525"> 
    <StackPanel> 
     <local:MyTestControl /> 
    </StackPanel> 
</Window> 

MyTestControl.xaml（MyTestControl.cs沒有改變）窗口我得到這個錯誤信息：

System.Windows.Data Error: 4 : Cannot find source for binding with reference 'ElementName=cb'. BindingExpression:Path=IsChecked; DataItem=null; target element is 'MyTestControl' (Name=''); target property is 'IsNextButtonEnabled' (type 'Boolean')

我不明白我的錯誤。我做錯了什麼？

在此先感謝。

Answer 1

試試這個，綁定的複選框的IsChecked到IsNextButtonEnabled財產

<ContentControl x:Class="WpfStackOverflowSpielWiese.TestControl" 
       xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
       xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
       x:Name="control"> 

    <Grid> 
    <CheckBox Name="cb" 
       IsChecked="{Binding ElementName=control, Path=IsNextButtonEnabled}" /> 
    </Grid> 
</ContentControl> 

代碼背後

public partial class TestControl : ContentControl 
{ 
    public TestControl() { 
    this.InitializeComponent(); 
    } 

    /// <summary> 
    /// Identifies the IsNextButtonEnabled dependency property 
    /// </summary> 
    public static readonly DependencyProperty IsNextButtonEnabledProperty = DependencyProperty.Register(
    "IsNextButtonEnabled", typeof(bool), typeof(TestControl), new PropertyMetadata(true)); 

    static TestControl() { 
    DefaultStyleKeyProperty.OverrideMetadata(typeof(TestControl), new FrameworkPropertyMetadata(typeof(TestControl))); 
    } 

    /// <summary> 
    /// Gets or sets the value indicating if the Next button of the control is enabled 
    /// </summary> 
    [Bindable(true)] 
    public bool IsNextButtonEnabled { 
    get { return (bool)this.GetValue(IsNextButtonEnabledProperty); } 
    set { this.SetValue(IsNextButtonEnabledProperty, value); } 
    } 
} 

希望這有助於