问题
What is the difference between a lambda expression and a predicate in .NET?
回答1:
A predicate is delegate (function object) that returns a boolean value. Lambda expressions can be used to define any anonymous function, which includes predicates, e.g. to express a predicate in the form of a lambda expression:
Predicate<int> isEven2 = x => x % 2 == 0;
which is functionally equivalent to:
Func<int,bool> isEven = x => x % 2 == 0;
回答2:
Predicate defines a set of criteria, while lambda expression is an anonymous function. You can use lambda ex. as a predicate, but that doesn't mean they are the same thing.
Predicate
Lambda expression
来源：https://stackoverflow.com/questions/11286775/what-is-the-difference-between-a-lambda-expression-and-a-predicate-in-net