Question

我有一个类似于以下结构的ViewModel

class Manager
{
    string Name;
    string Salary;
    List<Employee> reportees;
    void abstract SayHi();
}
class ShopManager() : Manager
{
    public override void SayHi()
    {
        Console.WriteLine("Hey I am a ShopManager");
    }
}
class GardenManager() : Manager
{
    public override void SayHi()
    {
        Console.WriteLine("Hey I am a GardenManager");
    }
}

我需要将Manager视图模型转换为实体。但实体可以是具体类型，如GardenManager或ShopManager（但具有与ManagerViewModel相同的属性）。

ShopManager可以将子项依赖为GardenManager，而Gardenmanager可以将子项依赖于其他具体类型。

如果ViewModel中的workType是“Shop”，则ViewModel应转换为ShopManager，同样也应转换为子项。

下面提到的示例实体。

NavigationView

有没有一种方法可以将这样的DTO转换为实体？

Answer 1

不按建议使用AutoMapper，您可以在POCO类上使用隐式运算符或使用ExtensionMethods进行转换：

<强> TestProgram：

class Program
{
    static void Main(string[] args)
    {
        ManagerViewModel viewModel = new ManagerViewModel
        {
            workType = "Garden"
        };

        // By implicit conversion
        Manager manager1 = viewModel;
        manager1.SayHi();

        // By extension method
        ShopManager manager2 = viewModel.ToEntity<ShopManager>();
        manager2.SayHi();

        Console.ReadLine();
    }
}

<强>输出：

嘿，我是GardenManager

嘿，我是ShopManager

隐含操作员示例：

public class ManagerViewModel
{
    public string Name;
    public long salary;
    public string workType;
    public List<EmployeeViewModel> Dependents;

    //  User-defined conversion from ManagerViewModel to ShopManager or GardenManager
    public static implicit operator Manager(ManagerViewModel viewModel)
    {
        switch (viewModel.workType)
        {
            case "Shop":
                // TODO: Do your conversion, Build ShopManager based on ManagerViewModel
                return new ShopManager();
            case "Garden":
                // TODO: Do your conversion, Build GardenManager based on ManagerViewModel
                return new GardenManager();
            default:
                throw new NotImplementedException();
        }
    }
}

Implicit (C# Reference)

ExtensionMethod示例：

internal static class EntityExtensions
{
    public static TSpecificManager ToEntity<TSpecificManager>(this ManagerViewModel managerViewModel)
        where TSpecificManager : new()
    {
        // Do your conversion based on ManagerViewModel
        return new TSpecificManager();
    }
}

Extension Methods (C# Programming Guide)

希望有所帮助

将ViewModel转换为具体的实体类型

1 个答案: