如何从其Click事件WPF停止执行按钮命令 [英] How to stop the Button Command execution from its Click event WPF

问题描述

基于单击事件的某些条件，是否有任何方法可以停止执行Button命令?

Is there any way to stop the Button command execution based on some condition on its click event?

实际上，我希望在我们的应用程序中单击某些按钮时弹出确认窗口.为了使其成为一个通用的解决方案，我做了以下工作:

Actually I want to have confirmation popup on some of the button click in our application. To make it a general solution, I have done the following:

1. 我扩展了WPF按钮类调用AppBarButton的扩展，该类已经包含一些依赖项属性.
2. 我对此还有2个属性，如下所示:IsActionConfirmationRequired和ConfirmationActionCommand.

1. I have extension of WPF button class call AppBarButton which already contains some dependency properties.
2. I have 2 more properties for this as below: IsActionConfirmationRequired and ConfirmationActionCommand.

如果IsActionConfirmationRequired，则在单击左键单击事件时，我将打开确认弹出窗口.

If IsActionConfirmationRequired then on left button cick event I am opening the confirmation popup.

有什么方法可以避免创建新的ConfirmationActionCommand，并使用与Button相同的Command属性?如果我设置了Command，然后在Button上单击，即使用户未确认仍然执行操作静止按钮命令，也遇到了问题.

Is there any way to avoid creating new ConfirmationActionCommand, and use the same Command property of the Button? The problem I am getting if I set Command, then on Button click even if user not confirmed the action still button command execute.

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}" />

请提出一些建议.我什么都找不到.已经尝试将CanExecute设置为false，但是禁用了它的make按钮，所以没有用.我只是简单地不想发出另一个命令，而将使用此AppBarButton的开发人员需要将ConfirmationActionCommand设置为不正常的Command.

Please suggest something. I am not able to find anything. Already tried CanExecute to false, but its make button disable so no use. I just simple dont want make another command, and developer who will use this AppBarButton need to set ConfirmationActionCommand not normal Command.

推荐答案

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

If I correctly understand, you want to confirm user's action and execute a command which is stored in the ButtonBase.Command property.

为此，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，调用基本方法，该方法将在用户确认操作或不需要确认的情况下从Command属性执行命令.

To achieve that remove the ConfirmationActionCommand property and use the OnClick method instead of the Click event. In the overriden OnClick method call the base method which will execute a command from the Command property if an user confirmed an action or there is no confirmation required.

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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