Expression trees permit lambda expressions to be represented as data structures instead of executable code 把代码封装为数据?还没领会它的真正意图是什么,好像也是为查询表达式服务的。
lambda expressions, an evolution of anonymous methods that provides improved type inference and conversions to both delegate types and expression trees lambda表达式,匿名函数的一种进化,为代理类型和表达式树提供改良的类型推断结果和转换。