您可以创建一个比较器,它接受Equals和GetHashCode方法的函数参数。类似于:
class Foo
{
public string Name { get; set; }
public int Id { get; set; }
}
class FooComparer : IEqualityComparer<Foo>
{
public FooComparer(Func<Foo, Foo, bool> equalityComparer, Func<Foo, int> getHashCode)
{
EqualityComparer = equalityComparer;
HashCodeGenerator = getHashCode;
}
Func<Foo, Foo, bool> EqualityComparer;
Func<Foo, int> HashCodeGenerator;
public bool Equals(Foo x, Foo y)
{
return EqualityComparer(x, y);
}
public int GetHashCode(Foo obj)
{
return HashCodeGenerator(obj);
}
}
...
List<Foo> foos = new List<Foo>() { new Foo() { Name = "A", Id = 4 }, new Foo() { Name = "B", Id = 4 } };
var list1 = foos.Distinct(new FooComparer((x, y) => x.Id == y.Id, f => f.Id.GetHashCode()));