private static void Handle(SyntaxNodeAnalysisContext context)
{
if (!context.IsExcludedFromAnalysis() &&
context.Node is InvocationExpressionSyntax {
Expression : MemberAccessExpressionSyntax {
Expression : { } expression
}
} invocation&&
DependencyProperty.TryGetOverrideMetadataCall(invocation, context.SemanticModel, context.CancellationToken, out var method) &&
context.SemanticModel.TryGetSymbol(expression, context.CancellationToken, out ISymbol? candidate) &&
BackingFieldOrProperty.TryCreateForDependencyProperty(candidate, out var fieldOrProperty) &&
method.TryFindParameter(KnownSymbols.PropertyMetadata, out var parameter) &&
invocation.TryFindArgument(parameter, out var metadataArg))
{
if (fieldOrProperty.TryGetAssignedValue(context.CancellationToken, out var value) &&
value is InvocationExpressionSyntax registerInvocation)
{
if (DependencyProperty.TryGetRegisterCall(registerInvocation, context.SemanticModel, context.CancellationToken, out var registerMethod) ||
DependencyProperty.TryGetRegisterReadOnlyCall(registerInvocation, context.SemanticModel, context.CancellationToken, out registerMethod) ||
DependencyProperty.TryGetRegisterAttachedCall(registerInvocation, context.SemanticModel, context.CancellationToken, out registerMethod) ||
DependencyProperty.TryGetRegisterAttachedReadOnlyCall(registerInvocation, context.SemanticModel, context.CancellationToken, out registerMethod))
{
if (registerMethod.TryFindParameter(KnownSymbols.PropertyMetadata, out var registerParameter) &&
registerInvocation.TryFindArgument(registerParameter, out var registeredMetadataArg) &&
context.SemanticModel.TryGetType(metadataArg.Expression, context.CancellationToken, out var type) &&
context.SemanticModel.TryGetType(registeredMetadataArg.Expression, context.CancellationToken, out var registeredType) &&
!type.IsAssignableTo(registeredType, context.Compilation))
{
context.ReportDiagnostic(Diagnostic.Create(Descriptors.WPF0017MetadataMustBeAssignable, metadataArg.GetLocation()));
}
}
}
else if (fieldOrProperty.Symbol == KnownSymbols.FrameworkElement.DefaultStyleKeyProperty &&
metadataArg.Expression is ObjectCreationExpressionSyntax metadataCreation)
{
if (!context.SemanticModel.TryGetSymbol(metadataCreation, KnownSymbols.FrameworkPropertyMetadata, context.CancellationToken, out _))
{
context.ReportDiagnostic(Diagnostic.Create(Descriptors.WPF0017MetadataMustBeAssignable, metadataArg.GetLocation()));
}
else if (metadataCreation.TrySingleArgument(out var typeArg) &&
typeArg is { Expression : TypeOfExpressionSyntax {
Type : IdentifierNameSyntax {
Identifier : { } identifier
}
} } &&
internal static bool TryGetDependencyProperty(ObjectCreationExpressionSyntax objectCreation, SemanticModel semanticModel, CancellationToken cancellationToken, out BackingFieldOrProperty fieldOrProperty)
{
fieldOrProperty = default;
var invocation = objectCreation.FirstAncestorOrSelf <InvocationExpressionSyntax>();
if (invocation == null)
{
return(false);
}
if (DependencyProperty.TryGetRegisterCall(invocation, semanticModel, cancellationToken, out _) ||
DependencyProperty.TryGetRegisterReadOnlyCall(invocation, semanticModel, cancellationToken, out _) ||
DependencyProperty.TryGetRegisterAttachedCall(invocation, semanticModel, cancellationToken, out _) ||
DependencyProperty.TryGetRegisterAttachedReadOnlyCall(invocation, semanticModel, cancellationToken, out _))
{
if (objectCreation.TryFirstAncestor <FieldDeclarationSyntax>(out var fieldDeclaration) &&
semanticModel.TryGetSymbol(fieldDeclaration, cancellationToken, out var field))
{
return(BackingFieldOrProperty.TryCreateForDependencyProperty(field, out fieldOrProperty));
}
if (objectCreation.TryFirstAncestor <PropertyDeclarationSyntax>(out var propertyDeclaration) &&
semanticModel.TryGetSymbol(propertyDeclaration, cancellationToken, out var property))
{
return(BackingFieldOrProperty.TryCreateForDependencyProperty(property, out fieldOrProperty));
}
return(false);
}
if (invocation.Expression is MemberAccessExpressionSyntax memberAccess &&
(DependencyProperty.TryGetAddOwnerCall(invocation, semanticModel, cancellationToken, out _) ||
DependencyProperty.TryGetOverrideMetadataCall(invocation, semanticModel, cancellationToken, out _)) &&
semanticModel.TryGetSymbol(memberAccess.Expression, cancellationToken, out ISymbol? candidate))
{
return(BackingFieldOrProperty.TryCreateForDependencyProperty(candidate, out fieldOrProperty));
}
return(false);
}
private static void Handle(SyntaxNodeAnalysisContext context)
{
if (!context.IsExcludedFromAnalysis() &&
context.Node is InvocationExpressionSyntax invocation &&
context.ContainingSymbol.IsStatic)
{
if (invocation.TryGetArgumentAtIndex(2, out var argument) &&
(DependencyProperty.TryGetRegisterCall(invocation, context.SemanticModel, context.CancellationToken, out _) ||
DependencyProperty.TryGetRegisterReadOnlyCall(invocation, context.SemanticModel, context.CancellationToken, out _) ||
DependencyProperty.TryGetRegisterAttachedCall(invocation, context.SemanticModel, context.CancellationToken, out _) ||
DependencyProperty.TryGetRegisterAttachedReadOnlyCall(invocation, context.SemanticModel, context.CancellationToken, out _)))
{
HandleArgument(context, argument);
}
else if (invocation.TryGetArgumentAtIndex(0, out argument))
{
if (DependencyProperty.TryGetAddOwnerCall(invocation, context.SemanticModel, context.CancellationToken, out _))
{
HandleArgument(context, argument);
}
else if (DependencyProperty.TryGetOverrideMetadataCall(invocation, context.SemanticModel, context.CancellationToken, out _) &&
invocation.Expression is MemberAccessExpressionSyntax {
Expression : { } expression
} &&
