Question

我有一个我的产品的模型视图，它有许多属性，我想用实体框架将它保存在数据库中。但是简单的方法就是使用这段代码：

public void NewProduct(NewProductModel viewModel)
{
   var dbModel = repository.FindProductById(viewModel.id);
   dbModel.Model = viewModel.Model;
   dbModel.Brand = viewModel.Brand;
   dbModel.Cost = viewModel.Cost;

   //its' too many

   repository.AddProduct(dbModel);
   repository.SaveChange();
}

但财产太多了。你有更好的方法来减少这些代码吗？

Answer 1

您可以使用AutoMapper或（https://github.com/AutoMapper/AutoMapper/wiki/Configuration）。

这是一个简短的例子：

// Make sure you check out the documentation before copy/pasting this
// code and using it as it's not the proper way of using automapper
public void NewProduct(NewProductModel viewModel)
{
    var dbModel = repository.FindProductById(viewModel.id);

    // If the properties have the same names already then AutoMapper can do it automatically
    var config = new MapperConfiguration(cfg => 
      cfg.CreateMap<NewProductModel, YourDBModelType>());

    // Otherwise you use can create your own mapping rules
    var config = new MapperConfiguration(cfg => 
      cfg.CreateMap<NewProductModel, YourDBModelType>()
        .ForMember(dest => dest.Model, opt => opt.MapFrom(src => src.Model))
        .ForMember(dest => dest.Brand, opt => opt.MapFrom(src => src.Brand))
        .ForMember(dest => dest.Cost, opt => opt.MapFrom(src => src.Cost)));


    // mapping
    var mapper = config.CreateMapper();
    var dbModel = mapper.Map<YourDBModelType>(viewModel);

   repository.AddProduct(dbModel);
   repository.SaveChange();
}

您可以在github repo

的文档部分找到更多信息

在数据库mvc中保存了modelview数据的许多属性

1 个答案: