处理wpf MVVM中的窗口关闭按钮 [英] handling window close button in wpf MVVM

问题描述

有没有一种方法可以通过绑定命令来处理窗口关闭按钮，即视图模型右上角的"X"?或覆盖window.close命令，以便关闭一个窗口可以返回到上一个窗口.谢谢.

is there a way to handle the window close button ie "X" in the top right corner in the viewmodel by binding to a command? or overriding the window.close command so that closing one window goes back to the previous window. Thanx.

推荐答案

有几种解决方法.我在下面指出了两种方法.

There are several methods for this. I have pointed out two methods below.

1. 您可以使用附加的命令来绑定视图模型中的关闭按钮.

1. You can use attached commands to bind the close button in your view model.

您可以使用以下代码

Xaml:

<Window x:Class="WpfInfragisticsModal.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525" 
        xmlns:ig="http://schemas.infragistics.com/xaml"
        xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
        Name="myWindow">
    <i:Interaction.Triggers>
        <i:EventTrigger EventName="Closing">
            <i:InvokeCommandAction Command="{Binding CloseWindowCommand}" />
        </i:EventTrigger>
    </i:Interaction.Triggers>
    <Grid>
    </Grid>
</Window>

注意:添加System.Windows.Interactivity参考

查看模型

private ICommand closeWindowCommand;

public ICommand CloseWindowCommand
{
      get
      {
          if (closeWindowCommand == null)
          {
             closeWindowCommand = new RelayCommand(param => this.CloseWindow(), null);
          }
          return closeWindowCommand;
      }
 }

private void CloseWindow()
{
     //Do your operations
}

这是我的RelayCommand类.

This is my RelayCommand class.

public class RelayCommand : ICommand
{
    /// <summary>
    /// Initializes a new instance of the <see cref="RelayCommand"/> class.
    /// </summary>
    /// <param name="execute">The execute.</param>
    public RelayCommand(Action<object> execute)
        : this(execute, null)
    {
    }

    /// <summary>
    /// Initializes a new instance of the <see cref="RelayCommand"/> class.
    /// </summary>
    /// <param name="execute">The execute.</param>
    /// <param name="canExecute">The can execute.</param>
    public RelayCommand(Action<object> execute, Predicate<object> canExecute)
    {
        if (execute == null)
            throw new ArgumentNullException("execute");
        _execute = execute;
        _canExecute = canExecute;
    }

    /// <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 null.</param>
    /// <returns>
    /// true if this command can be executed; otherwise, false.
    /// </returns>
    public bool CanExecute(object parameter)
    {
        return _canExecute == null ? true : _canExecute(parameter);
    }

    /// <summary>
    /// Occurs when changes occur that affect whether or not the command should execute.
    /// </summary>
    public event EventHandler CanExecuteChanged
    {
        add { CommandManager.RequerySuggested += value; }
        remove { 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 null.</param>
    public void Execute(object parameter)
    {
        _execute(parameter);
    }

    /// <summary>
    /// Action
    /// </summary>
    private readonly Action<object> _execute;


    /// <summary>
    /// Predicate
    /// </summary>
    private readonly Predicate<object> _canExecute;
}

这篇关于处理wpf MVVM中的窗口关闭按钮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！