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class Customer { public int ID { get; set; } public static bool Test(Customer x) { return x.ID == 5; } } ... List<Customer> custs = new List<Customer>(); custs.Add(new Customer() { ID = 1 }); custs.Add(new Customer() { ID = 5 }); custs.First(new Func<Customer, bool>(delegate(Customer x) { return x.ID == 5; })); custs.First(new Func<Customer, bool>((Customer x) => x.ID == 5)); custs.First(delegate(Customer x) { return x.ID == 5; }); custs.First((Customer x) => x.ID == 5); custs.First(x => x.ID == 5); custs.First(Customer.Test); 具体查看http://www.cnblogs.com/niyw/archive/2010/10/07/1845232.html
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