从linq表达式中提取方法名

在调试器的帮助下,我回答了自己的问题:

public static class MethodUtils
{
    public static string NameFromExpression(LambdaExpression expression)
    {
        MethodCallExpression callExpression = 
            expression.Body as MethodCallExpression;

        if(callExpression == null)
        {                
            throw new Exception("expression must be a MethodCallExpression");
        }

        return callExpression.Method.Name;
    }
}

对此实施有何评论?