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Checkbox.CheckedまたはUncheckedでコマンドを実行する

ウィンドウにチェックボックスコントロールがあります。関連するビューモデルのメソッドを呼び出すコマンドを実行したいと思います。チェックボックスの値も必要になります。コマンドをチェックボックスに関連付ける方法が見つからないようです。誰もこれをしましたか？

wpfmvvmcheckboxcommand
38
Hosea146
<CheckBox Content="CheckBox"
          Command="{Binding YourCommand}"
          CommandParameter="{Binding IsChecked, RelativeSource={RelativeSource Self}}" />
64
Arseny

MVVMを使用する場合、次のようなイベントトリガーを使用できます。

<CheckBox IsChecked="{Binding ServiceOrderItemTask.IsCompleted, Mode=TwoWay}" Content="{Binding ServiceOption.Name}">

    <i:Interaction.Triggers>
          <i:EventTrigger EventName="Checked">
                 <i:InvokeCommandAction Command="{Binding DataContext.IsCompletedCheckedCommand, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type t:RadGridView}}}" CommandParameter="{Binding}"/>
           </i:EventTrigger>

           <i:EventTrigger EventName="Unchecked">
                 <i:InvokeCommandAction Command="{Binding DataContext.IsCompletedUncheckedCommand, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type t:RadGridView}}}" CommandParameter="{Binding}"/>
           </i:EventTrigger>
    </i:Interaction.Triggers>
21
Igor S

これはあなたが必要とするもので動作します-

<CheckBox CommandParameter="{Binding}"
          Command="{Binding DataContext.AddRemovePresetAssignmentCommand,
          RelativeSource={RelativeSource FindAncestor,
                           AncestorType={x:Type UserControl}}}"
          Content="{Binding Path=Name}">
11
Rohit Vats

遅れました... Rohit Vatsの回答を使用して、このコードを思い付きました。

この例は実用的なコードの抜粋であり、すべての側面を理解するのを助けるためだけにここにあります。これは、アクティブまたは非アクティブのプッシュピンであり、DelegateCommandを使用します。おそらく、RelayCommandまたは他の同様のクラスを使用して同じジョブを実行することもできます。

コマンド：

using System.Windows.Input;

namespace HQ.Wpf.Util.Command
{
    public class StandardCommand
    {
        public static RoutedUICommand PinPropertyGrid = new RoutedUICommand("Pin property grid", "PinPropertyGrid", typeof(StandardCommand));

Xaml：

                            <CheckBox HorizontalAlignment="Right" 
                                      VerticalAlignment="Top"
                                      Margin="2,0,3,0" 
                                      Command="{Binding CommandPinPropertyGrid}"
                                      CommandParameter="{Binding IsChecked, RelativeSource={RelativeSource Self}}">
                                <CheckBox.Template>
                                    <ControlTemplate TargetType="{x:Type CheckBox}">
                                        <Grid>
                                            <Image x:Name="ImagePushpin" Width="16" Height="16" Source="pack://application:,,,/WpfUtil;component/Images/PushpinUnpinned16x16.png" />
                                        </Grid>
                                        <ControlTemplate.Triggers>
                                            <Trigger Property="IsChecked" Value="True">
                                                <Setter TargetName="ImagePushpin" Property="Source" Value="pack://application:,,,/WpfUtil;component/Images/PushpinPinned16x16.png" />
                                            </Trigger>
                                        </ControlTemplate.Triggers>
                                    </ControlTemplate>
                                </CheckBox.Template>
                            </CheckBox>

モデル：

public MainWindowViewModel()
{
    CommandPinPropertyGrid = new DelegateCommand<bool>(PinPropertyGrid);

...

// ******************************************************************
public DelegateCommand<bool> CommandPinPropertyGrid { get; private set; }

public void PinPropertyGrid(bool pinned)
{
    this.IsPropertyGridPinned = pinned;
}

DelegateCommand：

using System;
using System.Windows.Input;

namespace HQ.Wpf.Util.Command
{

    /// <summary>
    /// Represents a command that forwards the <c>Execute</c> and <c>CanExecute</c> calls to specified delegates.
    /// </summary>
    public class DelegateCommand<T> : ICommand
    {

        private readonly Action<T> _executeCallback;
        private readonly Predicate<T> _canExecuteCallback;

        /////////////////////////////////////////////////////////////////////////////////////////////////////
        // OBJECT
        /////////////////////////////////////////////////////////////////////////////////////////////////////

        /// <summary>
        /// Initializes a new instance of the <see cref="DelegateCommand<T>"/> class.
        /// </summary>
        /// <param name="executeCallback">The execute callback delegate.</param>
        public DelegateCommand(Action<T> executeCallback)
            : this(executeCallback, null)
        {
            // No-op
        }

        /// <summary>
        /// Initializes a new instance of the <see cref="DelegateCommand<T>"/> class.
        /// </summary>
        /// <param name="executeCallback">The execute callback delegate.</param>
        /// <param name="canExecuteCallback">The can execute callback delegate.</param>
        public DelegateCommand(Action<T> executeCallback, Predicate<T> canExecuteCallback)
        {
            if (executeCallback == null)
                throw new ArgumentNullException("executeCallback");

            this._executeCallback = executeCallback;
            this._canExecuteCallback = canExecuteCallback;
        }

        /////////////////////////////////////////////////////////////////////////////////////////////////////
        // INTERFACE IMPLEMENTATION
        /////////////////////////////////////////////////////////////////////////////////////////////////////

        #region ICommand Members

        /// <summary>
        /// Defines the method that determines whether the command can execute in its current state.
        /// </summary>
        /// <param name="parameter">Data used by the command.  If the command does not require data to be passed, this object can be set to <see langword="null"/>.</param>
        /// <returns>
        /// <c>true</c> if this command can be executed; otherwise, <c>false</c>.
        /// </returns>
        public bool CanExecute(object parameter)
        {
            return (this._canExecuteCallback == null) ? true : this._canExecuteCallback((T)parameter);
        }

        /// <summary>
        /// Occurs when changes occur that affect whether or not the command should execute.
        /// </summary>
        public event EventHandler CanExecuteChanged
        {
            add
            {
                if (this._canExecuteCallback != null)
                    CommandManager.RequerySuggested += value;
            }
            remove
            {
                if (this._canExecuteCallback != null)
                    CommandManager.RequerySuggested -= value;
            }
        }

        /// <summary>
        /// Defines the method to be called when the command is invoked.
        /// </summary>
        /// <param name="parameter">Data used by the command.  If the command does not require data to be passed, this object can be set to <see langword="null"/>.</param>
        public void Execute(object parameter)
        {
            this._executeCallback((T)parameter);
        }

        #endregion // ICommand Members

    }
}
0
Eric Ouellet