Question

我有自定义控件

    static CustomControl1()
    {
        DefaultStyleKeyProperty.OverrideMetadata(typeof(CustomControl1), new     FrameworkPropertyMetadata(typeof(CustomControl1)));
    }

    public List<string> MyProperty
    {
        get { return (List<string>)GetValue(MyPropertyProperty); }
        set { SetValue(MyPropertyProperty, value); }
    }
    public static readonly DependencyProperty MyPropertyProperty =
        DependencyProperty.Register("MyProperty", typeof(List<string>), 
                                                   typeof(CustomControl1), 
                                                   new UIPropertyMetadata(new List<string>()));

当我在我的应用程序中使用多个 CustomControl1 并为每个 MyProperty

设置值时

  <StackPanel HorizontalAlignment="Left" Orientation="Vertical" VerticalAlignment="Top" Width="176">
        <local:CustomControl1>          
            <local:CustomControl1.MyProperty>
                <System:String>A</System:String>
                <System:String>B</System:String>
                <System:String>C</System:String>
                <System:String>D</System:String>
            </local:CustomControl1.MyProperty>          
        </local:CustomControl1>
        <local:CustomControl1>          
            <local:CustomControl1.MyProperty>
                <System:String>F</System:String>
                <System:String>E</System:String>                    
            </local:CustomControl1.MyProperty>          
        </local:CustomControl1>
    </StackPanel>

运行解决方案时，每个 CustomControl1 中显示的所有值并且在设计模式下仅显示最后一个customcontrol1的值。

所以看起来它们共享相同的实例数据。

Answer 1

为集合创建依赖属性（List，Dictionary ...）时， 始终在类的构造函数 中重新初始化DP。（否则，您将对所有实例使用相同的列表）

所以在你的情况下：

public CustomControl1()
{
    MyProperty = new List<string>();
}

并删除Dependency Property的默认值中的值：

public static readonly DependencyProperty MyPropertyProperty =
        DependencyProperty.Register("MyProperty", typeof(List<string>), 
                                                   typeof(CustomControl1), 
                                                   new UIPropertyMetadata(null));

CustomControl中的项目Wpf

1 个答案: