WPF MVVM: ICommand Binding to Controls

Question

I completely lost the command binding that is used in MVVM. How to associate my object with a window and / or its command with a control to get the method called in Button Click?

Here is the class CustomerViewModel:

public class CustomerViewModel : ViewModelBase
{
    RelayCommand _saveCommand;
    public ICommand SaveCommand
    {
        get
        {
            if (_saveCommand == null)
            {
                _saveCommand = new RelayCommand(param => this.Save(), param => this.CanSave);
                NotifyPropertyChanged("SaveCommand");
            }
            return _saveCommand;
        }
    }

    public void Save()
    {
        ...
    }

    public bool CanSave { get { return true; } }

    ...

ViewModelBaseimplements the interface INotifyPropertyChanged Here is how it is Buttonattached to the command:

<Button Content="Save" Margin="3" Command="{Binding DataContext.Save}" />

An instance is CustomerViewModelassigned to the DataContextwindow containing Button.

This example does not work: I put a breakpoint in the method Save, but execution does not go to the method. I have seen many examples (also on stackoverflow), but I cannot figure out how to specify a binding.

Please advise any help would be appreciated.

Thank.

P.S. , RelativeSource Button... - :

 Command="{Binding Path=DataContext.Save, RelativeSource={RelativeSource AncestorType={x:Type ItemsControl}}}"

?

Answer 1

, , - Save. , .

, DataContext CustomerViewModel, SaveCommand:

<Button Content="Save" Margin="3" Command="{Binding SaveCommand}" />

NotifyPropertyChanged("SaveCommand");.