自定义控件数据绑定wpf [英] Custom Control DataBinding wpf

问题描述

当前正在实现一个自定义控件，我想直接从我的viewModel绑定一些Value，而不使用xaml。
我可以这样做：

Currently implementing a custom control I would like to bind some Value directly from my viewModel without using xaml. I can do this:

<customControls:MyControl MyValue="{Binding ElementName=MyElem, Path=Text}">
<Textbox Text="{Binding Mytext}" />

但不是：

<customControls:MyControl MyValue="{Binding MyText}">

控件在模板中定义，并且在MyProperty的控件代码中定义为：

The controls is defined in a template and inside the Control code my the MyProperty is defined as:

   public static readonly DependencyProperty MyValueProperty = DependencyProperty.Register("MyValue", typeof(double), typeof(CustomOEE), new FrameworkPropertyMetadata((Double)20,FrameworkPropertyMetadataOptions.BindsTwoWayByDefault));
   public double MyValue
   {
       get
       {
           return (double)GetValue(MyValueProperty);
       }
       set
       {
           SetValue(MyValueProperty, value);

       }
   }

非常感谢您的帮助

推荐答案

作为一个普遍的答案，在UserControl中，您仅绑定到UserControl DependencyProperties，并使用ElementName或RelativeSource绑定来完成，应该从不在UserControl中设置DataContext。

As a general answer, within a UserControl you bind just to the UserControl DependencyProperties and you do that with ElementName or RelativeSource binding and you should never set the DataContext within a UserControl.

public static readonly DependencyProperty MyOwnDPIDeclaredInMyUcProperty = 
    DependencyProperty.Register("MyOwnDPIDeclaredInMyUc", 
         typeof(string), typeof(MyUserControl));

public string MyOwnDPIDeclaredInMyUc
{
   get
   {
       return (string)GetValue(MyOwnDPIDeclaredInMyUcProperty);
   }
   set
   {
       SetValue(MyOwnDPIDeclaredInMyUcProperty, value);

   }
}

xaml

 <UserControl x:Name="myRealUC" x:class="MyUserControl">
   <TextBox Text="{Binding ElementName=myRealUC, Path=MyOwnDPIDeclaredInMyUc, Mode=TwoWay}"/>
 <UserControl>

如果这样做，您可以在任何视图中轻松使用此用户控件，例如：

If you do that you can easily use this Usercontrol in any view like:

<myControls:MyUserControl MyOwnDPIDeclaredInMyUc="{Binding MyPropertyInMyViewmodel}"/>

这篇关于自定义控件数据绑定wpf的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！