C#中两个List<TModel>中根据指定条件--判断并获取不同数据的数据集合

C#中两个List<TModel>中根据指定条件--判断并获取不同数据的数据集合

原始需求：已经插入的数据不再重复插入(所有数据中排除已有数据，不存在数据以新对象形式存储在对象三种)

方式一：

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public class Test    {        public int age { get; set; }        public string name { get; set; }        public int score { get; set; }    }

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List<Test> list1 = new List<Test>(); list1.Add(new Test { score = 10, name = "001" }); list1.Add(new Test { score = 20, name = "002" }); list1.Add(new Test { score = 30, name = "003" }); list1.Add(new Test { score = 40, name = "004" }); list1.Add(new Test { score = 50, name = "005" }); list1.Add(new Test { score = 60, name = "005" });   List<Test> list2 = new List<Test>(); list2.Add(new Test { score = 10, name = "001" }); list2.Add(new Test { score = 20, name = "002" }); list2.Add(new Test { score = 30, name = "003" }); list2.Add(new Test { score = 40, name = "004" });   //list3 return 2 List<Test> list3 = list1.Where(x => !list2.Any(x2 => x.score == x2.score)).ToList(); //list4 return 2 List<Test> list4 = list1.Where(x => list2.All(x2 => x.score != x2.score)).ToList();   MessageBox.Show("list3==" + list3.Count+"\r\nlist4==" + list4.Count);

方式二：list1、list2数据参考方式一

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public class DifferentModel : IEqualityComparer<Test>     {         public bool Equals(Test x, Test y)         {             return x.score == y.score;         }           public int GetHashCode(Test obj)         {             return obj.ToString().GetHashCode();         }     }   List<Test> different = list1.Except(list2, new DifferentModel()).ToList();//差集   MessageBox.Show("different=="+different.Count);

方式三：仅供参考，根据实际情况注意Contains关键字 注意使用——不建议使用

//return 2

List<Test> temp = list1.Where(p => !list2.Select(b => b.score).Contains(p.score)).ToList();
MessageBox.Show("temp=="+temp.Count);