using System;

using System.Collections.Generic;

using System.Linq;

using System.Text.Json;

using System.Text.Json.Serialization;

public class Program

{

    public static void Main()

    {

        IEnumerable<Te> test = new ArrayList<Te>() { 

            new() { Name = "ab", Age=2},

            new() { Name = "ab", Age=4},

            new() { Name = "ab", Age=6},

        };

        IEnumerable<Te> t = test.Where(c=> c.Age != 4);

        string jsonString = JsonSerializer.Serialize(t);

​

        Console.WriteLine(jsonString);

    }

public class Te {

    public string Name {get;set;}

    public int Age {get;set;}

        }

    private static void TryCreate(UriKind uriKind)

    {

        var emptyUrl = string.Empty;

        var success = Uri.TryCreate(emptyUrl, uriKind, out var createdUri);

        Console.WriteLine($"TryCreate(emptyUrl, UriKind.{uriKind}, out var createdUri) => Success: {success}");

        Console.WriteLine();

    }

}