在C#中查找所有SQL Server数据库用户

using System;
using System.Data.SqlClient;

class Program
{
    static void Main()
    {
        string connectionString = "Data Source=YourServerName;Initial Catalog=YourDatabaseName;User ID=YourUsername;Password=YourPassword";
        using (SqlConnection connection = new SqlConnection(connectionString))
        {
            connection.Open();

            // 查询所有数据库用户的SQL语句
            string sql = "SELECT name FROM sys.sysusers WHERE issqluser = 1";

            using (SqlCommand command = new SqlCommand(sql, connection))
            {
                using (SqlDataReader reader = command.ExecuteReader())
                {
                    while (reader.Read())
                    {
                        string username = reader.GetString(0);
                        Console.WriteLine(username);
                    }
                }
            }
        }
    }
}