即使只返回一个对象，我也必须遍历从Dapper返回的IEnumerable吗？

using Dapper;
using System.Data.SqlClient;

public class UserRepository
{
    private readonly string connectionString;

    public UserRepository(string connectionString)
    {
        this.connectionString = connectionString;
    }

    public User GetUserById(int id)
    {
        using (var connection = new SqlConnection(connectionString))
        {
            connection.Open();
            var query = "SELECT * FROM Users WHERE Id = @Id";
            var parameters = new { Id = id };
            var user = connection.QueryFirstOrDefault<User>(query, parameters);
            return user;
        }
    }
}

public class User
{
    public int Id { get; set; }
    public string Name { get; set; }
    // other properties
}