发表新帖
发表新帖

handling window close button in wpf MVVM

后端 未结
关注
2 763
伪装坚强ぢ
伪装坚强ぢ 2020-12-09 03:56

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 cl

2条回答
  • 孤街浪徒
    孤街浪徒 (楼主)
    2020-12-09 04:09

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

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

    2. You can use Below code

    Xaml:

    NOTE: Add System.Windows.Interactivity reference

    View Model

    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
}

    This is my RelayCommand class.

    public class RelayCommand : ICommand
{
    /// 
    /// Initializes a new instance of the  class.
    /// 
    /// The execute.
    public RelayCommand(Action execute)
        : this(execute, null)
    {
    }

    /// 
    /// Initializes a new instance of the  class.
    /// 
    /// The execute.
    /// The can execute.
    public RelayCommand(Action execute, Predicate canExecute)
    {
        if (execute == null)
            throw new ArgumentNullException("execute");
        _execute = execute;
        _canExecute = canExecute;
    }

    /// 
    /// Defines the method that determines whether the command can execute in its current state.
    /// 
    /// Data used by the command.  If the command does not require data to be passed, this object can be set to null.
    /// 
    /// true if this command can be executed; otherwise, false.
    /// 
    public bool CanExecute(object parameter)
    {
        return _canExecute == null ? true : _canExecute(parameter);
    }

    /// 
    /// Occurs when changes occur that affect whether or not the command should execute.
    /// 
    public event EventHandler CanExecuteChanged
    {
        add { CommandManager.RequerySuggested += value; }
        remove { CommandManager.RequerySuggested -= value; }
    }

    /// 
    /// Defines the method to be called when the command is invoked.
    /// 
    /// Data used by the command.  If the command does not require data to be passed, this object can be set to null.
    public void Execute(object parameter)
    {
        _execute(parameter);
    }

    /// 
    /// Action
    /// 
    private readonly Action _execute;


    /// 
    /// Predicate
    /// 
    private readonly Predicate _canExecute;
}

    
    
             
    
                                                        
    
            
            
    
              
                
                0
              
                   
                
               讨论(0)
              
                                                  
              
              
    
                          
             
       
          
              
    
                                       
    

    

                
    
                         
          
                              			
        
        
        
    
          
    
            
            
    
              
              
    
            
    


                                 
              
    
            
    
                          
    

        
         
    
                
                
    
                  
                
    
                
    
                   看不清?
                
    
              
    
                                  
    
                    
   
                 
             
              
    提交回复
    
            
    
          
    
        
    
      
       
      
    
    
    
          
 
     
 
    
        
    热议问题