How to write a ViewModelBase in MVVM

Question

I\'m pretty new in WPF programming environment. I\'m trying to write a program out using MVVM design pattern.

I\'ve did some studies and read up some articles relate

Answer 1

The below class can be used as a ViewModelBase in WPF projects:

public abstract class ViewModelBase : INotifyPropertyChanged
{
    /// 

    /// Multicast event for property change notifications.
    /// 
    public event PropertyChangedEventHandler PropertyChanged;

    /// 

    /// Checks if a property already matches a desired value.  Sets the property and
    /// notifies listeners only when necessary.
    /// 
    /// Type of the property.
    /// Reference to a property with both getter and setter.
    /// Desired value for the property.
    /// Name of the property used to notify listeners.This
    /// value is optional and can be provided automatically when invoked from compilers that
    /// support CallerMemberName.
    /// True if the value was changed, false if the existing value matched the
    /// desired value.
    protected virtual bool SetProperty(ref T storage, T value, [CallerMemberName] string propertyName = null)
    {
        if (object.Equals(storage, value)) return false;
        storage = value;
        // Log.DebugFormat("{0}.{1} = {2}", this.GetType().Name, propertyName, storage);
        this.OnPropertyChanged(propertyName);
        return true;
    }

    /// 

    /// Notifies listeners that a property value has changed.
    /// 
    /// Name of the property used to notify listeners.  This
    /// value is optional and can be provided automatically when invoked from compilers
    /// that support .
    protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
    {
        var eventHandler = this.PropertyChanged;
        if (eventHandler != null)
            eventHandler(this, new PropertyChangedEventArgs(propertyName));
    }
}

And an example of ViewModel class is:

public class MyViewModel : ViewModelBase
{
    private int myProperty;
    public int MyProperty
    {
        get { return myProperty; }
        set { SetProperty(ref myProperty, value);
    }
}