What is the difference between a lambda expression and a predicate in .NET?

Question

.NET中的lambda表达式和谓词有什么区别？

Answer 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, eg 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;

Answer 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