MVVM - ICommand的和INotifyPropertyChanged的查詢

Question

所有，

剛開始瓦特/ MVVM ......得到了交談ABT MVVM幾篇文章......我有兩個疑問..

1. 始終INotifyPropertyChanged的和的ICommand執行會是這樣嗎？還是需要其他更改？

2. 如果我點擊某個按鈕，需要調用一些模型的方法？我怎樣才能達到目的？

THX提前..

這家酒店實現@模型

#region INotifyPropertyChanged Members 
public event PropertyChangedEventHandler PropertyChanged; 
private void OnPropertyChanged(string propertyName) 
{ 
    if (PropertyChanged != null) 
    { 
     PropertyChanged(this, new PropertyChangedEventArgs(propertyName)); 
    } 
} 
#endregion 

的ICommand - 這是實現@ VM

private ICommand mUpdater; 
public ICommand UpdateCommand 
{ 
    get 
    { 
     if (mUpdater == null) 
      mUpdater = new Updater(); 
     return mUpdater; 
    } 
    set 
    { 
     mUpdater = value; 
    } 
} 

private class Updater : ICommand 
{ 
    #region ICommand Members 
    public bool CanExecute(object parameter) 
    { 
     return true; 
    } 

    public event EventHandler CanExecuteChanged; 

    public void Execute(object parameter) 
    { 

    } 

    #endregion 
} 

Answer 1

1. 在framework platform with which I've had more experience ICommand是imp與一個叫做DelegateCommand的漂亮類共事。它基本上允許你在其他地方實現你的Execute和CanExecute方法。

2. 在您的視圖模型，你將有一個命令，然後執行該視圖模型的模型的方法：

   public class SomeViewModel : ViewModelBase<SomeModel> 
   { 
       //implemented in the base class: 
       //public Model SomeModel { get; } 
   
       internal ICommand SomeMethodThatIsReallyOnMyModel 
       { 
        get 
        { 
         return _someCommandYouHaveImplementedToDoJustThis; 
        } 
        //_someCommandYouHaveImplementedToDoJustThis.Execute: 
        //Model.SomeMethod() 
       } 
   
   //... 
   

   }