WPF自定义控件的自定义属性如何在调用XAML中设置？

[conwinston]

我的自定义控件(MyControl)中定义了一个属性：
private Button _myButton = null;
public StackPanel MyButton
{
get { return _myButton; }
set
{
_myButton = value;
OnPropertyChanged(new PropertyChangedEventArgs("MyButton"));
}
}

让它在调用界面的XAML中关联一个Button：
<Button Name="Button1"/>
<MyControl MyButton="Button1"/>

这样写运行后报错，错误提示不能将String转化成Button。
这种自定义控件中定义关联其他控件的方式在WinForm里非常常用，求教在WPF中英如何实现。

[assky124]

你定义的是Button 但是对外公布的属性却是StackPanel,能编译通过？

[hiworldman]

首先代码有问题，另可以这样实现。在考虑如何实现类似与Binding Element那样的效果

 /// <summary>
    /// 在考虑如何做成Binding ElementName  Path类似的效果
    /// </summary>
    public class PropertyRegister : Button
    {
        public PropertyRegister()
        {
         
        }


        public static readonly DependencyProperty ContorlNameProperty =
            DependencyProperty.Register("ContorlName", typeof(string), typeof(PropertyRegister), new PropertyMetadata(null, ContorlNamePropertyChangedCallback));

        private static void ContorlNamePropertyChangedCallback(DependencyObject sender, DependencyPropertyChangedEventArgs e)
        {
            //无法在设计中时获取 控件的树形结构
            //此控件加载完了之后才能弄VisualTreeHelper获取相应的父子控件
            //PropertyRegister owner = sender as PropertyRegister;
            //owner.MyButton = GetNearObject<Button>(owner, e.NewValue.ToString());
        }

        public T GetRefControl<T>() where T : FrameworkElement
        {
            return GetNearObject<T>(this, ContorlName);
        }

        public string ContorlName 
        {
            get 
            {
                return (string)GetValue(ContorlNameProperty); 
            }
            set 
            {
                SetValue(ContorlNameProperty, value);
            } 
        }

        public static T GetParentObject<T>(DependencyObject obj, string name) where T : FrameworkElement
        {
            DependencyObject parent = VisualTreeHelper.GetParent(obj);

            while (parent != null)
            {
                if (parent is T && (((T)parent).Name == name | string.IsNullOrEmpty(name)))
                {
                    return (T)parent;
                }

                parent = VisualTreeHelper.GetParent(parent);
            }

            return null;
        }

        public static T GetChildObject<T>(DependencyObject obj, string name) where T : FrameworkElement
        {
            DependencyObject child = null;
            T grandChild = null;

            for (int i = 0; i <= VisualTreeHelper.GetChildrenCount(obj) - 1; i++)
            {
                child = VisualTreeHelper.GetChild(obj, i);

                if (child is T && (((T)child).Name == name | string.IsNullOrEmpty(name)))
                {
                    return (T)child;
                }
                else
                {
                    grandChild = GetChildObject<T>(child, name);
                    if (grandChild != null)
                        return grandChild;
                }
            }

            return null;

        }


        public static T GetNearObject<T>(DependencyObject obj, string name) where T : FrameworkElement
        {
            DependencyObject parent = GetParentObject<FrameworkElement>(obj, "");
            T nearobj = GetChildObject<T>(parent, name);
            if (nearobj == null)
            {
                return GetNearObject<T>(parent, name);
            }
            return nearobj;

        }

       
         
    
    }

    <Grid x:Name="LayoutRoot" Background="White">
        <Grid>
            <StackPanel>
               
                <Button x:Name="btn" Click="btn_Click" Height="24"></Button>
                
                <Slider x:Name="sd" Minimum="0" Maximum="100" Value="30"></Slider>
                <TextBox Text="{Binding ElementName=sd,Path=Value}"></TextBox>
            </StackPanel>
        </Grid>
        <na:PropertyRegister x:Name="pr" ContorlName="btn" Width="125" Height="24" Content="myCustomControl"></na:PropertyRegister>
    </Grid>

 public partial class TestRoot : UserControl
    {
        public TestRoot()
        {
            InitializeComponent();
        }

        private void btn_Click(object sender, RoutedEventArgs e)
        {
            pr.GetRefControl<Button>().Content = System.DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss");
        }

      
    }

[一个破人]

贴了那么多代码，没用啊。

自定义控件也是对象啊！

实例化对象，调用属性即可。

[sundayX]

使用DependencyProperty