向动态LINQ查询添加静态列

using System;
using System.Linq;
using System.Linq.Dynamic.Core;

public class Person
{
    public string Name { get; set; }
    public int Age { get; set; }
}

public class Program
{
    public static void Main()
    {
        var people = new[]
        {
            new Person { Name = "Alice", Age = 25 },
            new Person { Name = "Bob", Age = 30 },
            new Person { Name = "Charlie", Age = 35 }
        };

        string staticColumn = "Country";
        string staticValue = "USA";

        var query = people.AsQueryable()
            .Select($"new (Name, Age, {staticValue} as {staticColumn})");

        foreach (var result in query)
        {
            Console.WriteLine($"Name: {result.Name}, Age: {result.Age}, {staticColumn}: {result.Country}");
        }
    }
}