c# – 如何从Click事件WPF中停止Button Command的执行

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有没有办法根据Click事件的某些条件停止Button命令的执行？

实际上我想在我们的应用程序中点击一些按钮确认弹出窗口.为了使其成为一般解决方案,我做了以下工作：

>我有WPF按钮类调用AppBarButton的扩展,它已经包含一些依赖属性.
>我还有2个属性,如下所示：IsActionConfirmationRequired和ConfirmationActionCommand.

如果IsActionConfirmationRequired然后在左按钮cick事件我打开确认弹出窗口.

有没有办法避免创建新的ConfirmationActionCommand,并使用Button的相同Command属性？如果我设置Command,我会得到的问题,然后按下按钮,即使用户没有确认动作仍然按钮命令执行.

C#：

public class AppBarButton : Button
{
    public AppBarButton()
    {
        this.Click += AppBarButton_Click;
    }

    private void AppBarButton_Click(object sender, RoutedEventArgs e)
    {
        Button button = sender as Button;
        if (button == null || IsActionConfirmationRequired == false || ConfirmationActionCommand == null)
            return;

        const string defaultMessage = "Do you really want to {0}";

        string confirmationPopUpMessage = string.IsNullOrEmpty(ActionConfirmationMessage)
          ? DebugFormat.Format(defaultMessage, button.Content)
          : ActionConfirmationMessage;

        ConfirmationDailogDetails confirmationDailogDetails = new ConfirmationDailogDetails
        {
            Message = confirmationPopUpMessage,
            ActionName = button.Content.ToString(),
            Template = button.Template,
            ActionCommand = ConfirmationActionCommand
        };

        //instead of ConfirmationActionCommand want to use base.Command
        ConfirmationDailog dialog = new ConfirmationDailog(confirmationDailogDetails)
        {
            PlacementTarget = button,
            IsOpen = true
        };
    }

    public static readonly DependencyProperty IsActionConfirmationRequiredProperty =
        DependencyProperty.Register("IsActionConfirmationRequired", typeof(bool), typeof(AppBarButton));

    public static readonly DependencyProperty ActionConfirmationMessageProperty =
        DependencyProperty.Register("ActionConfirmationMessage", typeof(string), typeof(AppBarButton));

    public static readonly DependencyProperty ConfirmationActionCommandProperty =
       DependencyProperty.Register("ConfirmationActionCommand", typeof(ICommand), typeof(AppBarButton));

    /// <summary>
    /// Gets or sets the flag to show the confirmation popup on before taking any action on App Bar button click.
    /// Also its required to set the command in Tag Property of the App Bar button not in the Command Property, then only required command will fire only when user
    /// confirms and click on the action button on confirmation popup.
    /// </summary>
    public bool IsActionConfirmationRequired
    {
        get { return (bool)GetValue(IsActionConfirmationRequiredProperty); }
        set { SetValue(IsActionConfirmationRequiredProperty, value); }
    }

    /// <summary>
    /// Gets or sets the confirmation message in confirmation popup  before taking any action on App Bar button click.
    /// </summary>
    public ICommand ConfirmationActionCommand
    {
        get { return (ICommand)GetValue(ConfirmationActionCommandProperty); }
        set { SetValue(ConfirmationActionCommandProperty, value); }
    }
}

XAML：

<controls:AppBarButton x:Key="WithdrawAll"
                       AppBarOrder="1"
                       PageIndex="1"
                       AppBarOrientation="Left"
                       Content="Withdraw" IsActionConfirmationRequired="True"
                       ConfirmationActionCommand="{Binding WithdrawAllCommand}"
                       Template="{StaticResource DeleteCircleIcon}" />

请提出建议.我找不到任何东西.已经尝试过CanExecute为false,但是make按钮禁用所以没用.我只是简单的不想要另一个命令,并且将使用此AppBarButton的开发人员需要设置ConfirmationActionCommand而不是正常的命令.

解决方法:

如果我正确理解,您需要确认用户的操作并执行存储在ButtonBase.Command属性中的命令.

要实现这一点,请删除ConfirmationActionCommand属性并使用OnClick方法而不是Click事件.在重写的OnClick方法中,调用base方法,如果用户确认操作或者不需要确认,它将从Command属性执行命令.

public class AppBarButton : Button
{
    public static readonly DependencyProperty IsActionConfirmationRequiredProperty =
        DependencyProperty.Register("IsActionConfirmationRequired", typeof(bool), typeof(AppBarButton));

    public static readonly DependencyProperty ActionConfirmationMessageProperty =
        DependencyProperty.Register("ActionConfirmationMessage", typeof(string), typeof(AppBarButton));

    public bool IsActionConfirmationRequired
    {
        get { return (bool)GetValue(IsActionConfirmationRequiredProperty); }
        set { SetValue(IsActionConfirmationRequiredProperty, value); }
    }

    public string ActionConfirmationMessage
    {
        get { return (string)GetValue(ActionConfirmationMessageProperty ); }
        set { SetValue(ActionConfirmationMessageProperty , value); }
    }

    protected override void OnClick()
    {
        bool confirmed = true;

        if (IsActionConfirmationRequired)
        {
            ConfirmationDailogDetails confirmationDailogDetails = new ConfirmationDailogDetails
            {
                Message = confirmationPopUpMessage,
                ActionName = button.Content.ToString(),
                Template = button.Template,
                ActionCommand = ConfirmationActionCommand
            };

            ConfirmationDailog dialog = new ConfirmationDailog(confirmationDailogDetails)
            {
                PlacementTarget = button,
                IsOpen = true
            };

            // Set confirmed here

            // If you set the DialogResult property in the ConfirmationDailog class then
            // confirmed = dialog.ShowDialog().Value;
        }

        // If there is no confirmation requred or if an user have confirmed an action
        // then call base method which will execute a command if it exists.
        if (confirmed)
        {
            base.OnClick();
        }
    }
}

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