mvvm in wpf

observable property

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private string _firstName;
public string FirstName
{
  get
  {
    return _firstName;
  }
  set
  {
    if (_firstName == value)
    {
      return;
    }
    _firstName = value;
    var handler = PropertyChanged;
    if (handler != null)
    {
      handler(this, new PropertyChangedEventArgs("FirstName"));
    }
  }
}

In order to solve this, MVVM Light proposes a few solutions:

• The logic needed to raise the PropertyChanged event can be stored in a ViewModelBase class that every ViewModel inherits from.
• Properties can be identified by a lambda expression instead of a string. This prevents typos or errors when the name of the property changes.
• The remaining lines can be automated using a code snippet in Visual Studio.

MVVM in WPF

WPF MVVM step by step (Basics to Advance Level)

对应的中文翻译

https://www.oschina.net/translate/wpf-mvvm-step-by-step-basics-to-advance-level?lang=chs&page=2#