private static void ImplementINotifyPropertyChanged(CodeFixContext context, SemanticModel semanticModel, ClassDeclarationSyntax classDeclaration, DocumentEditor editor)
{
var type = (ITypeSymbol)semanticModel.GetDeclaredSymbol(classDeclaration, context.CancellationToken);
var underscoreFields = CodeStyle.UnderscoreFields(semanticModel);
if (!type.Is(KnownSymbol.INotifyPropertyChanged))
{
if (classDeclaration.BaseList != null &&
classDeclaration.BaseList.Types.TryFirst(
x => (x.Type as IdentifierNameSyntax)?.Identifier.ValueText.Contains("INotifyPropertyChanged") == true,
out var baseType) &&
context.Diagnostics.Any(IsINotifyPropertyChangedMissing))
{
editor.ReplaceNode(baseType, SyntaxFactory.SimpleBaseType(INotifyPropertyChangedType));
}
else
{
editor.AddInterfaceType(classDeclaration, INotifyPropertyChangedType);
}
}
if (!type.TryFindEventRecursive("PropertyChanged", out _))
{
editor.AddEvent(
classDeclaration,
(EventFieldDeclarationSyntax)editor.Generator.EventDeclaration(
"PropertyChanged",
PropertyChangedEventHandlerType,
Accessibility.Public));
}
if (!type.TryFindFirstMethodRecursive(
"OnPropertyChanged",
m => m.Parameters.Length == 1 &&
m.Parameters[0]
.Type == KnownSymbol.String,
out _))
{
if (type.IsSealed)
{
editor.AddMethod(
classDeclaration,
ParseMethod(
@"private void OnPropertyChanged([System.Runtime.CompilerServices.CallerMemberName] string propertyName = null)
{
this.PropertyChanged?.Invoke(this, new System.ComponentModel.PropertyChangedEventArgs(propertyName));
}",
underscoreFields));
}
else
{
editor.AddMethod(
classDeclaration,
ParseMethod(
@"protected virtual void OnPropertyChanged([System.Runtime.CompilerServices.CallerMemberName] string propertyName = null)
{
this.PropertyChanged?.Invoke(this, new System.ComponentModel.PropertyChangedEventArgs(propertyName));
}",
underscoreFields));
}
}
}
