public static Expression Is<TValue>(
	Expression<Predicate<TValue>> match
)

Allows the specification of a predicate to perform matching of method call arguments.

This example shows how to return the value 1 whenever the argument to the Do method is an even number.

CopyC#

mock.Protected()
    .Setup("Do", ItExpr.Is<int>(i => i % 2 == 0))
    .Returns(1);

This example shows how to throw an exception if the argument to the method is a negative number:

CopyC#

mock.Protected()
    .Setup("GetUser", ItExpr.Is<int>(i => i < 0))
    .Throws(new ArgumentException());