有没有办法通过代码中完成的键绑定将参数传递给命令？

发布于 08-29 11:08 字数 231 浏览 9 评论 0原文

我正在制作一个自定义控件，我需要添加一些默认的键绑定，微软已经完成了在文本框中复制和粘贴的操作。然而，其中一个键绑定需要将参数传递给它所绑定的命令。在xaml中执行此操作很简单，有什么方法可以在代码中执行此操作吗？

this.InputBindings.Add(new KeyBinding(ChangeToRepositoryCommand, new KeyGesture(Key.F1)));

原文

I am making a custom control I need to add some default keybindings, microsoft has already done with copy and paste in a textbox. However one of the keybindings needs to pass a parameter to the command which it is bound to. It is simple to do this in xaml, is there any way to do this in code?

this.InputBindings.Add(new KeyBinding(ChangeToRepositoryCommand, new KeyGesture(Key.F1)));

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零時差2024-09-05 11:08:41

我找到了答案：

InputBindings.Add(new KeyBinding(ChangeToRepositoryCommand, new KeyGesture(Key.F1)) { CommandParameter = 0 });

如果我的问题不清楚，我深表歉意。

I found the answer:

InputBindings.Add(new KeyBinding(ChangeToRepositoryCommand, new KeyGesture(Key.F1)) { CommandParameter = 0 });

I apologize if my question was unclear.

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很糊涂小朋友2024-09-05 11:08:41

复制和粘贴命令由文本框处理，因此参数并未严格传递，但我知道您的意思。

我使用 hack - 和附加属性来执行此操作，就像

   public class AttachableParameter : DependencyObject {

      public static Object GetParameter(DependencyObject obj) {
         return (Object)obj.GetValue(ParameterProperty);
      }

      public static void SetParameter(DependencyObject obj, Object value) {
         obj.SetValue(ParameterProperty, value);
      }

      // Using a DependencyProperty as the backing store for Parameter.  This enables animation, styling, binding, etc...
      public static readonly DependencyProperty ParameterProperty =
          DependencyProperty.RegisterAttached("Parameter", typeof(Object), typeof(AttachableParameter), new FrameworkPropertyMetadata(null, FrameworkPropertyMetadataOptions.Inherits));
}

在 xaml 中

<ListBox local:AttachableParameter.Parameter="{Binding RelativeSource={RelativeSource Self}, Path=SelectedItems}" />

一样，它使参数成为选定的项目

，然后当命令在窗口上触发时，我使用它来查看命令参数是否存在（我从可以执行并执行）

  private Object GetCommandParameter() {
     Object parameter = null;
     UIElement element = FocusManager.GetFocusedElement(this) as UIElement;
     if (element != null) {
        parameter = AttachableParameter.GetParameter(element as DependencyObject);
     }
     return parameter;
  }

这是一个黑客，但我还没有找到另一种方法来获取从键绑定触发的绑定的命令参数。（我很想知道更好的方法）

The copy and paste commands are handled by the text box so parameters are not strictly passed, but i know what you are getting at.

I do this using a hack - and an attached property, like so

   public class AttachableParameter : DependencyObject {

      public static Object GetParameter(DependencyObject obj) {
         return (Object)obj.GetValue(ParameterProperty);
      }

      public static void SetParameter(DependencyObject obj, Object value) {
         obj.SetValue(ParameterProperty, value);
      }

      // Using a DependencyProperty as the backing store for Parameter.  This enables animation, styling, binding, etc...
      public static readonly DependencyProperty ParameterProperty =
          DependencyProperty.RegisterAttached("Parameter", typeof(Object), typeof(AttachableParameter), new FrameworkPropertyMetadata(null, FrameworkPropertyMetadataOptions.Inherits));
}

then in the xaml

<ListBox local:AttachableParameter.Parameter="{Binding RelativeSource={RelativeSource Self}, Path=SelectedItems}" />

which makes the parameter the selected items

then when the command fires on the window i use this to see if the command parameter is there (i call this from the can execute and the Executed)

  private Object GetCommandParameter() {
     Object parameter = null;
     UIElement element = FocusManager.GetFocusedElement(this) as UIElement;
     if (element != null) {
        parameter = AttachableParameter.GetParameter(element as DependencyObject);
     }
     return parameter;
  }

It is a hack, but i have not found another way to get the command parameter for a binding that is fired from a key binding. (I would love to know a better way)

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