Today, working on a new feature for my pet project, I realized that I have to notify the view, that all properties in view model have changed. The most obvious way to achieve that would, of course be to rise PropertyChange event a bunch of times.

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protected virtual void OnPropertyChanged(Expression<Func<object>> propertyExpression)
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{
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   //..
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   //implementation
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   //..
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}
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protected virtual void OnPropertyChanged(string propertyName)
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{
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   //..
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   //implementation
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   //..
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}
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public void Refresh()
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{
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   OnPropertyChanged(() => FirstProperty);
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   OnPropertyChanged(() => SecondProperty);
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   OnPropertyChanged(() => ThirdProperty);
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   //and so on ...
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}

This is good solution for one time usage, however I was interested in something more general, something which could be extracted to base view model. Fortunately, it turns out that there is a simple trick to do that. All You have to do is use an empty string or null as a property name. So in my case this comes down to this one-liner

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public void Refresh()
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{
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   OnPropertyChanged(string.Empty);
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}