WPF依赖项属性ObservableCollection显示多个值

Question

我有一个用户控件在WPF中，我想传递一个项目列表，当我在另一个窗口中使用用户控件（用户控件包含一个组合框和标签，并具有一些重要的功能）。这工作正常，如果我有我的网页上的单个控件，但如果我有两个我从两个我的用户控件列出值，大概是因为DependencyProperty是静态的。我无法删除静态，因为它在注册依赖项属性时引发错误。

public static readonly DependencyProperty ComboBoxValuesProperty = 
    DependencyProperty.Register("ComboBoxValues", typeof(ObservableCollection<ComboBoxValue>), typeof(SystemConfigComboBox), 
    new PropertyMetadata(new ObservableCollection<ComboBoxValue>())); 

public ObservableCollection<ComboBoxValue> ComboBoxValues 
{ 
    get { return GetValue(ComboBoxValuesProperty) as ObservableCollection<ComboBoxValue>; } 
    set { SetValue(ComboBoxValuesProperty, value); } 
} 

下面显示了一个包含值1和值2

<customEditors:SystemConfigComboBox SystemConfigEntry="Entry1" ComboBoxLabel="Combo 1" ComboBoxWidth="300"> 
    <customEditors:SystemConfigComboBox.ComboBoxValues> 
     <customEditors:ComboBoxValue DisplayValue="Value1" ActualValue="VALUE1" /> 
    </customEditors:SystemConfigComboBox.ComboBoxValues> 
</customEditors:SystemConfigComboBox> 
<customEditors:SystemConfigComboBox SystemConfigEntry="Entry2" ComboBoxLabel="Combo 2" ComboBoxWidth="300"> 
    <customEditors:SystemConfigComboBox.ComboBoxValues> 
     <customEditors:ComboBoxValue DisplayValue="Value2" ActualValue="VALUE2" /> 
    </customEditors:SystemConfigComboBox.ComboBoxValues> 
</customEditors:SystemConfigComboBox> 

和公正的信息，ComboBoxValue类两个用户控件组合框： -

public class ComboBoxValue : FrameworkElement 
{ 
    public static readonly DependencyProperty DisplayValueProperty = 
     DependencyProperty.Register("DisplayValue", typeof(string), typeof(ComboBoxValue)); 

    public static readonly DependencyProperty ActualValueProperty = 
     DependencyProperty.Register("ActualValue", typeof(string), typeof(ComboBoxValue)); 

    public string DisplayValue 
    { 
     get { return (string)GetValue(DisplayValueProperty); } 
     set { SetValue(NameProperty, value); } 
    } 

    public string ActualValue 
    { 
     get { return (string)GetValue(ActualValueProperty); } 
     set { SetValue(ActualValueProperty, value); } 
    } 

} 

Answer 1

你应该在的构造函数初始化ObservableCollection控制类而不在DependencyProperty.Register方法中：

public class SystemConfigComboBox 
{ 
    public SystemConfigComboBox() 
    { 
     ComboBoxValues = new ObservableCollection<ComboBoxValue>(); 
    } 

    public static readonly DependencyProperty ComboBoxValuesProperty = 
      DependencyProperty.Register("ComboBoxValues", typeof(ObservableCollection<ComboBoxValue>), typeof(SystemConfigComboBox))); 

    ... 
} 

请参阅MSDN，了解更多有关这一点：https://msdn.microsoft.com/en-us/library/aa970563(v=vs.110).aspx