如何使用.net core 3库项目从本地计算机连接到服务器上已有的数据库

using Microsoft.EntityFrameworkCore;

public class MyDbContext : DbContext
{
    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
    {
        optionsBuilder.UseSqlServer("YourConnectionString");
    }
}

public class MyEntity
{
    public int Id { get; set; }
    public string Name { get; set; }
}

public class Program
{
    public static void Main(string[] args)
    {
        using (var dbContext = new MyDbContext())
        {
            var entities = dbContext.Set<MyEntity>().ToList();
            foreach (var entity in entities)
            {
                Console.WriteLine($"Id: {entity.Id}, Name: {entity.Name}");
            }
        }
    }
}