由於DelegateCommand WPF應用程序中的內存泄漏

Question

我剛剛完成使用MVVM模式編寫WPF和c＃的桌面應用程序。在這個應用程序中，我使用委託命令實現來包裝我的ModelView中公開的ICommands屬性。問題是這些DelegateCommands阻止我的ModelView和View在關閉視圖後被垃圾回收。所以它一直在讀書，直到我終止整個申請。我剖析了應用程序，我發現這完全是關於將modelview保存在內存中的delegatecommand。 我怎麼能避免這種情況，這是mvvm模式的性質，還是它關於我的模式植入？謝謝。

編輯：這是我如何實現MVVM模式

首先小而全部分：CommandDelegte類

class DelegateCommand:ICommand 
{ 
    private Action<object> execute; 
    private Predicate<object> canExcute; 
    public DelegateCommand(Action<object> execute, Predicate<object> canExecute) 
    { 
     if (execute == null) 
     { 
      throw new ArgumentNullException("execute"); 
     } 
     this.execute = execute; 
     this.canExcute = canExecute; 
    } 
    public bool CanExecute(object parameter) 
    { 
     if (this.canExcute != null) 
     { 
      return canExcute(parameter); 
     } 
     return true; 
    } 

    public event EventHandler CanExecuteChanged 
    { 
     add { CommandManager.RequerySuggested += value; } 
     remove { CommandManager.RequerySuggested -= value; } 
    } 


    public void Execute(object parameter) 
    { 
     this.execute(parameter); 
    } 
} 

二：模型視圖類

public class ViewModel:DependencyObject, INotifyPropertyChanged 
{ 
    private DelegateCommand printCommand; 

    public ICommand PrintCommand 
    { 
     get 
     { 
      if (printCommand == null) 
      { 
       printCommand = new DelegateCommand(Print, CanExecutePrint); 
      } 
      return printCommand; 
     } 
    } 
    void Print(object obj) 
    { 
     Console.WriteLine("Print Command"); 

    } 
    bool CanExecutePrint(object obj) 
    { 
     return true; 
    } 


    public event PropertyChangedEventHandler PropertyChanged; 
    private void OnProeprtyChanged(string propertyName) 
    { 
     if (PropertyChanged != null) 
     { 
      PropertyChanged(this, new PropertyChangedEventArgs(propertyName)); 
     } 
    } 
} 

三：窗口後面的代碼

public MainWindow() 
    { 
     InitializeComponent(); 
     base.DataContext = new ViewModel(); 
    } 

第四：我的XAML

<Window x:Class="WpfApplication1.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"> 
<Window.InputBindings> 
    <KeyBinding Key="P" Modifiers="Control" Command="{Binding Path=PrintCommand}"/> 
</Window.InputBindings> 
<StackPanel> 
    <Button Content="Print - Ctrl+P" Width="75" Height="75" Command="{Binding Path=PrintCommand}"/> 
</StackPanel>