Automatic INotifyPropertyChanged Implementation through T4 code generation?

Question

I\'m currently working on setting up a new project of mine and was wondering how I could achieve that my ViewModel classes do have INotifyPropertyChanged support while not h

Answer 1

It should definitely work.

I'd recommend first writing a base class that implements INotifyPropertyChanged, giving it a protected void OnPropertyChanged(string propertyName) method, making it cache its PropertyChangeEventArgs objects (one per unique property name -- no point in creating a new object every time the event is raised), and have your T4-generated class derive from this base.

To get the members that need properties implemented, you can just do something like:

BindingFlags flags = BindingFlags.Instance | BindingFlags.NonPublic;
FieldInfo[] fieldsNeedingProperties = inputType.GetFields(flags)
    .Where(f => f.Name.StartsWith("p_"))
    .ToArray();

And go from there:

<# foreach (var field in fieldsNeedingProperties) { #>
<# string propertyName = GetPropertyName(field.Name); #>
    public <#= field.FieldType.FullName #> <#= propertyName #> {
        get { return <#= field.Name #>; }
        set {
            <#= field.Name #> = value;
            OnPropertyChanged("<#= propertyName #>");
        }
    }
<# } #>

<#+
    private string GetPropertyName(string fieldName) {
        return fieldName.Substring(2, fieldName.Length - 2);
    }
#>

And so on.