public static bool IsTypeInferred(this VariableDeclaratorSyntax variable, SemanticModel semanticModel)
{
var variableTypeName = variable.GetVariableType();
if (variableTypeName == null)
{
return(false);
}
return(variableTypeName.IsTypeInferred(semanticModel));
}
private IEnumerable<ITypeSymbol> InferTypeInVariableDeclarator(VariableDeclaratorSyntax variableDeclarator)
{
var variableType = variableDeclarator.GetVariableType();
if (variableType == null)
{
return SpecializedCollections.EmptyEnumerable<ITypeSymbol>();
}
var types = GetTypes(variableType).Where(t => !IsUnusableType(t));
if (variableType.IsVar)
{
var variableDeclaration = variableDeclarator.Parent as VariableDeclarationSyntax;
if (variableDeclaration != null)
{
if (variableDeclaration.IsParentKind(SyntaxKind.UsingStatement))
{
// using (var v = Foo())
return SpecializedCollections.SingletonEnumerable(this.Compilation.GetSpecialType(SpecialType.System_IDisposable));
}
if (variableDeclaration.IsParentKind(SyntaxKind.ForStatement))
{
// for (var v = Foo(); ..
return SpecializedCollections.SingletonEnumerable(this.Compilation.GetSpecialType(SpecialType.System_Int32));
}
// Return the types here if they actually bound to a type called 'var'.
return types.Where(t => t.Name == "var");
}
}
return types;
}