private static bool IsReturned(MethodDeclarationSyntax method, StatementSyntax statement, SemanticModel semanticModel, ILocalSymbol identitySymbol)
{
var anonymousFunction = statement.FirstAncestorOfKind(SyntaxKind.ParenthesizedLambdaExpression,
SyntaxKind.SimpleLambdaExpression, SyntaxKind.AnonymousMethodExpression) as AnonymousFunctionExpressionSyntax;
IMethodSymbol methodSymbol;
BlockSyntax body;
if (anonymousFunction != null)
{
methodSymbol = semanticModel.GetSymbolInfo(anonymousFunction).Symbol as IMethodSymbol;
body = anonymousFunction.Body as BlockSyntax;
}
else
{
methodSymbol = semanticModel.GetDeclaredSymbol(method);
body = method.Body;
}
if (body == null)
{
return(true);
}
var returnTypeSymbol = methodSymbol?.ReturnType;
if (returnTypeSymbol == null)
{
return(false);
}
if (returnTypeSymbol.SpecialType == SpecialType.System_Void)
{
return(false);
}
var bodyDescendantNodes = body.DescendantNodes().ToList();
var returnExpressions = bodyDescendantNodes.OfType <ReturnStatementSyntax>().Select(r => r.Expression).Union(
bodyDescendantNodes.OfKind <YieldStatementSyntax>(SyntaxKind.YieldReturnStatement).Select(yr => yr.Expression));
var isReturning = returnExpressions.Any(returnExpression =>
{
var returnSymbol = semanticModel.GetSymbolInfo(returnExpression).Symbol;
if (returnSymbol == null)
{
return(false);
}
return(returnSymbol.Equals(identitySymbol));
});
return(isReturning);
}
private static bool IsReturned(MethodDeclarationSyntax method, StatementSyntax statement, SemanticModel semanticModel, ILocalSymbol identitySymbol)
{
var anonymousFunction = statement.FirstAncestorOfKind(SyntaxKind.ParenthesizedLambdaExpression,
SyntaxKind.SimpleLambdaExpression, SyntaxKind.AnonymousMethodExpression) as AnonymousFunctionExpressionSyntax;
IMethodSymbol methodSymbol;
BlockSyntax body;
if (anonymousFunction != null)
{
methodSymbol = semanticModel.GetSymbolInfo(anonymousFunction).Symbol as IMethodSymbol;
body = anonymousFunction.Body as BlockSyntax;
}
else
{
methodSymbol = semanticModel.GetDeclaredSymbol(method);
body = method.Body;
}
if (body == null) return true;
var returnExpressions = body.DescendantNodes().OfType<ReturnStatementSyntax>().Select(r => r.Expression);
var returnTypeSymbol = methodSymbol?.ReturnType;
if (returnTypeSymbol == null) return false;
if (returnTypeSymbol.SpecialType == SpecialType.System_Void) return false;
var isReturning = returnExpressions.Any(returnExpression =>
{
var returnSymbol = semanticModel.GetSymbolInfo(returnExpression).Symbol;
if (returnSymbol == null) return false;
return returnSymbol.Equals(identitySymbol);
});
return isReturning;
}