Base class for ViewModels, implements OnPropertyChanged. Nothing further to do.

mvvm-viewmodelbase.snippet

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  <CodeSnippet Format="1.0.0">
    <Header>
      <SnippetTypes>
        <SnippetType>Expansion</SnippetType>
      </SnippetTypes>
      <Title>mvvm-viewmodelbase</Title>
      <Author>
      </Author>
      <Description>
      </Description>
      <HelpUrl>
      </HelpUrl>
      <Shortcut>mvvmviewmodelbase</Shortcut>
    </Header>
    <Snippet>
      <Code Language="csharp" Delimiter="$"><![CDATA[public partial class ViewModelBase : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;

    protected void Set<T>(ref T storage, T value, [CallerMemberName]string propertyName = null)
    {
        if (Equals(storage, value))
        {
            return;
        }

        storage = value;
        OnPropertyChanged(propertyName);
    }

    protected void OnPropertyChanged(string propertyName) => PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}]]></Code>
    </Snippet>
  </CodeSnippet>
</CodeSnippets>

ViewModelBase.cs

using System.ComponentModel;
using System.Runtime.CompilerServices;

// TODO: Namespace

/// <summary>
/// Base class for ViewModels, implements OnPropertyChanged. Nothing further to do.
/// </summary>
public partial class ViewModelBase : INotifyPropertyChanged
{
    public ViewModelBase()
    {
    }
    
    #region Property Changed
    public event PropertyChangedEventHandler PropertyChanged;
    protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
    {
        var handler = PropertyChanged;
        if (handler != null) handler(this, new PropertyChangedEventArgs(propertyName));
    }
    #endregion
}