Best way to determine if an expression is a constant expression

Question

Which one do you prefer for testing if an expression is a ConstantExpression ? From the NodeType property or a cast, and why?

    public static bool IsConstantExpression(Expression expression)
    {
        return expression.NodeType == ExpressionType.Constant;
        return expression is ConstantExpression;
    }

Answer 1

One difference is expression.NodeType == ExpressionType.Constant will throw an exception if expression is null. I'm pretty sure ConstantExpression is nullable, so that statement would be valid still.

Answer 2

我认为进行属性访问比让运行时检查对象的类型更好。