Implementing INotifyPropertyChanged

Writing programs in WPF usually involves implementing INotifyPropertyChanged. Implementing this interface the standard way involves a fair-bit of boilerplate code. It’s tiresome and error prone.

There are many ways to mitigate this issue. Frameworks like Caliburn.Micro or post compilers like PostSharp can reduce the amount of required boilerplate.

I opt for a middle ground and implement the interface directly with the addition of one helper method.

public event PropertyChangedEventHandler PropertyChanged;

protected virtual void OnPropertyChanged(string propertyName)
    var handler = PropertyChanged;
    if (handler != null) handler(this, new PropertyChangedEventArgs(propertyName));

private void Set<T>(ref T property, T value, [CallerMemberName] string propertyName = null)
    if (EqualityComparer<T>.Default.Equals(property, value)) return;
    property = value;

I can then write properties as follows

public string Name
    get { return _name; }
    set { Set(ref _name, value); }

It’s a compromise between a big hammer like Caliburn.Micro or PostSharp and boilerplate.

The EqualityComparer<T>.Default.Equals(property, value) call avoids boxing value types, a common criticism of some approaches.

← newer older →
.Net, Technology, Life, Whatever

Recent Posts

Quick Tip - Clear ReSharper's Cache to Fix False Errors
Quick Tip - Refined GitHub
Vertical Layout for HTML Tables
Visual Studio 2017 Installer Quick Tip
VSColorOutput for VS 2017 Released
Quick ReSharper tip for inline templates
NoSQL vs. NewSQL: What's the Difference?
More... (1077)

Donate with PayPal