internal static bool TryGetRegisterField(PropertyDeclarationSyntax property, SemanticModel semanticModel, CancellationToken cancellationToken, out BackingFieldOrProperty result)
{
result = default;
if (TryGetBackingFields(property, semanticModel, cancellationToken, out var getter, out var setter))
{
if (DependencyProperty.TryGetDependencyPropertyKeyFieldOrProperty(getter, semanticModel, cancellationToken, out var keyField))
{
getter = keyField;
}
if (ReferenceEquals(setter.Symbol, getter.Symbol))
{
result = setter;
return(true);
}
}
return(false);
}
private static void Handle(SyntaxNodeAnalysisContext context)
{
if (!context.IsExcludedFromAnalysis() &&
context.Node is InvocationExpressionSyntax invocation &&
TryGetArgs(context, out var target, out var propertyArg, out var valueArg) &&
context.SemanticModel.TryGetSymbol(propertyArg.Expression, context.CancellationToken, out var symbol) &&
BackingFieldOrProperty.TryCreateForDependencyProperty(symbol, out var fieldOrProperty))
{
if (IsWrongType(fieldOrProperty, valueArg, context, out var registeredType))
{
context.ReportDiagnostic(
Diagnostic.Create(
Descriptors.WPF0014SetValueMustUseRegisteredType,
valueArg.GetLocation(),
target.Name,
registeredType));
}
if (fieldOrProperty.Type == KnownSymbols.DependencyProperty &&
DependencyProperty.TryGetDependencyPropertyKeyFieldOrProperty(fieldOrProperty, context.SemanticModel, context.CancellationToken, out var keyField))
{
context.ReportDiagnostic(
Diagnostic.Create(
Descriptors.WPF0040SetUsingDependencyPropertyKey,
propertyArg.GetLocation(),
properties: ImmutableDictionary <string, string> .Empty.Add(nameof(DependencyPropertyKeyType), keyField.Name),
propertyArg,
keyField.CreateArgument(context.SemanticModel, propertyArg.SpanStart)));
}
if (target == KnownSymbols.DependencyObject.SetCurrentValue &&
fieldOrProperty.Symbol is IFieldSymbol setField &&
setField == KnownSymbols.FrameworkElement.DataContextProperty)
{
context.ReportDiagnostic(
Diagnostic.Create(
Descriptors.WPF0043DoNotUseSetCurrentValueForDataContext,
invocation.GetLocation(),
setField.Name,
invocation.ArgumentList.Arguments[1]));
}
}
}
public override async Task RegisterCodeFixesAsync(CodeFixContext context)
{
var document = context.Document;
var syntaxRoot = await document.GetSyntaxRootAsync(context.CancellationToken)
.ConfigureAwait(false);
var semanticModel = await document.GetSemanticModelAsync(context.CancellationToken)
.ConfigureAwait(false);
foreach (var diagnostic in context.Diagnostics)
{
var token = syntaxRoot.FindToken(diagnostic.Location.SourceSpan.Start);
if (string.IsNullOrEmpty(token.ValueText))
{
continue;
}
var invocation = syntaxRoot.FindNode(diagnostic.Location.SourceSpan)
.FirstAncestorOrSelf <InvocationExpressionSyntax>();
if (invocation == null || invocation.IsMissing)
{
continue;
}
if (DependencyObject.TryGetSetValueCall(invocation, semanticModel, context.CancellationToken, out _) &&
BackingFieldOrProperty.TryCreateForDependencyProperty(semanticModel.GetSymbolSafe(invocation.ArgumentList.Arguments[0].Expression, context.CancellationToken), out var fieldOrProperty))
{
if (DependencyProperty.TryGetDependencyPropertyKeyFieldOrProperty(
fieldOrProperty,
semanticModel,
context.CancellationToken,
out var keyField))
{
context.RegisterCodeFix(
CodeAction.Create(
invocation.ToString(),
cancellationToken => ApplyFixAsync(
context.Document,
invocation,
null,
keyField.CreateArgument(semanticModel, token.SpanStart),
cancellationToken),
this.GetType().FullName),
diagnostic);
}
continue;
}
if (DependencyObject.TryGetSetCurrentValueCall(invocation, semanticModel, context.CancellationToken, out _) &&
BackingFieldOrProperty.TryCreateForDependencyProperty(semanticModel.GetSymbolSafe(invocation.ArgumentList.Arguments[0].Expression, context.CancellationToken), out fieldOrProperty))
{
if (DependencyProperty.TryGetDependencyPropertyKeyFieldOrProperty(
fieldOrProperty,
semanticModel,
context.CancellationToken,
out var keyField))
{
context.RegisterCodeFix(
CodeAction.Create(
invocation.ToString(),
cancellationToken => ApplyFixAsync(
context.Document,
invocation,
SetValueExpression(invocation.Expression),
keyField.CreateArgument(semanticModel, token.SpanStart),
cancellationToken),
this.GetType().FullName),
diagnostic);
}
}
}
}
