net中的对象复制方法:自动映射器、发射映射器、隐式操作、属性复制

如果有人知道更多在.NET中做这件事的方法,你对此有什么看法?你选择哪种方法?为什么?

下面是对.NET中不同的对象复制方法的测试。

How to copy value from class X to class Y with the same property name in c#?

所以,在这里,你可以自己运行它:

static void Main(string[] args)
    {
        Student _student = new Student();
        _student.Id = 1;
        _student.Name = "Timmmmmmmmaaaahhhh";
        _student.Courses = new List<int>();
        _student.Courses.Add(101);
        _student.Courses.Add(121);

        Stopwatch sw = new Stopwatch();

        Mapper.CreateMap<Student, StudentDTO>();            

        StartTest(sw, "Auto Mapper");

        for (int i = 0; i < 1000000; i++)
        {
            StudentDTO dto = Mapper.Map<Student, StudentDTO>(_student);
        }

        StopTest(sw);

        StartTest(sw, "Implicit Operator");

        for (int i = 0; i < 1000000; i++)
        {
            StudentDTO itemT = _student;
        }

        StopTest(sw);

        StartTest(sw, "Property Copy");

        for (int i = 0; i < 1000000; i++)
        {

            StudentDTO itemT = new StudentDTO
            {
                Id = _student.Id,
                Name = _student.Name,
            };

            itemT.Courses = new List<int>();
            foreach (var course in _student.Courses)
            {
                itemT.Courses.Add(course);
            }
        }

        StopTest(sw);

        StartTest(sw, "Emit Mapper");

        ObjectsMapper<Student, StudentDTO> emitMapper = ObjectMapperManager.DefaultInstance.GetMapper<Student, StudentDTO>();

        for (int i = 0; i < 1000000; i++)
        {
            StudentDTO itemT = emitMapper.Map(_student);
        }

        StopTest(sw);
    }

我的电脑上的测试结果:

测试自动Mapper:22322 ms

试验性质Copy:250 ms

您可以从这里获得发射和自动映射器:

http://emitmapper.codeplex.com/

http://automapper.codeplex.com/