C# Distinct去重泛型List
2021/7/16 11:14:34
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List<int>
去重List<string>
去重List<T>
去重
1、List<int>去重
1 List<int> ilist = new List<int>() { 1, 2, 3, 4, 5, 5,3,1 }; 2 ilist = ilist.Distinct().ToList(); 3 foreach (var item in ilist) 4 { 5 Console.WriteLine(item); 6 }
2、List<string>
去重
List<string> strList = new List<string>() { "4", "4", "5", "6", "6" }; strList = strList.Distinct().ToList(); foreach (var item in strList) { Console.WriteLine(item); }
3、List<T>
去重
public class User { public int Id { get; set; } public string Name { get; set; } } //去重类 public class LambdaComparer<T> : IEqualityComparer<T> { private readonly Func<T, T, bool> _lambdaComparer; private readonly Func<T, int> _lambdaHash; public LambdaComparer(Func<T, T, bool> lambdaComparer) : this(lambdaComparer, EqualityComparer<T>.Default.GetHashCode) { } public LambdaComparer(Func<T, T, bool> lambdaComparer, Func<T, int> lambdaHash) { if (lambdaComparer == null) throw new ArgumentNullException("比较值为空"); if (lambdaHash == null) throw new ArgumentNullException("数组的Hash值为空"); _lambdaComparer = lambdaComparer; _lambdaHash = lambdaHash; } public bool Equals(T x, T y) { return _lambdaComparer(x, y); } public int GetHashCode(T obj) { return _lambdaHash(obj); } } static void Main(string[] args) { List<User> list = new List<User>() { new User() { Id = 1, Name = "张三" } , new User() { Id = 1, Name = "王五" } , new User() { Id = 1, Name = "张三" } , new User() { Id = 3, Name = "李四" } , }; list = list.Distinct(new LambdaComparer<User>((a, b) => a.Name == b.Name, obj => obj.ToString().GetHashCode())).ToList(); foreach (var item in list) { Console.WriteLine("Id:" + item.Id + ", Name:" + item.Name); } Console.ReadLine(); }
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