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我提到過我沒有用DTO的很多東西。我在DataTransfereObjects上玩弄polimophism。我找不到一個很好的解決方案，所以我已經使這個代碼示例掌握了DataTransfereObjects和不同邏輯實現的多態性，使用Polymorphism，泛型，接口，抽象等等。掌握dto多態性
請檢查驗證碼。告訴我什麼是壞的，可以做得更好或更容易。檢查accessmodifier，同時檢查SOLID（認爲我沒有正確理解它）。最後，它似乎太複雜了，以這種方式解決這個問題常見嗎？
實際上，我嘗試調用一些（de）序列化的程序邏輯，它使用baseDto來派生dtos而不會丟失它們的特定信息。這個代碼應該是一個乾淨的抽象沙箱，用於解決這類問題。
void Main()
{
var twoIngrDto = new TwoIngredientsDto();
var threeIngrDto = new ThreeIngredientsDto();
var twoIngrMulAnswerChecker = new TwoIngredientsMultiplicationAnswerChecker();
var threeIngrAddAnswerChecker = new ThreeIngredientsAdditionAnswerChecker();
twoIngrMulAnswerChecker.IsTheAnswerCheckImplementationTheAnswer(twoIngrDto); //TRUE .Dump();
threeIngrAddAnswerChecker.IsTheAnswerCheckImplementationTheAnswer(threeIngrDto); //TRUE .Dump();
twoIngrMulAnswerChecker.IsTheAnswerCheckImplementationTheAnswer(threeIngrDto); //FALSE .Dump();
IAnswerCheck answerchecker = new IngredientsAnswerChecker();
answerchecker.CheckAnswer(twoIngrMulAnswerChecker, twoIngrDto); //TRUE .Dump();
answerchecker.CheckAnswer(threeIngrAddAnswerChecker, threeIngrDto); //TRUE .Dump();
/// QUESTION: How can I use the answerchecker 'twoIngrMulAnswerChecker' with the derived DTO 'threeIngrDto'
/// It failes with following error:
/// The type 'UserQuery.TwoIngredientsMultiplicationAnswerChecker' cannot be used as
/// type parameter 'T' in the generic type or method 'UserQuery.IngredientsAnswerChecker.CheckAnswer<T,DTO>(T, DTO)'.
/// There is no implicit reference conversion from 'UserQuery.TwoIngredientsMultiplicationAnswerChecker'
/// to 'UserQuery.TheAnswerChecker<UserQuery.ThreeIngredientsDto>'.
//answerchecker.CheckAnswer(twoIngrMulAnswerChecker, threeIngrDto).Dump();
answerchecker.CheckAnswer(twoIngrMulAnswerChecker, (TwoIngredientsDto)threeIngrDto).Dump(); // is casting the solution?
}
interface IAnswerCheck
{
bool CheckAnswer<T, DTO>(T answerCkecker, DTO ingredientsDto)
where T : TheAnswerChecker<DTO>
where DTO : IngredientDto;
}
public abstract class TheAnswerChecker<T> where T : IngredientDto
{
internal abstract int TheAnswerCheckImplementation(T answerIngredietsDto);
private int TheAnswer {get { return 42;} }
public bool IsTheAnswerCheckImplementationTheAnswer(T answerIngredietsDto)
{
return TheAnswer == TheAnswerCheckImplementation(answerIngredietsDto);
}
}
//generate a base class
public class IngredientsAnswerChecker : IAnswerCheck //: TheAnswerChecker<IngredientDto>
{
public bool CheckAnswer<T, DTO>(T answerCkecker, DTO ingredientsDto)
where T : TheAnswerChecker<DTO>
where DTO : IngredientDto
{
return answerCkecker.IsTheAnswerCheckImplementationTheAnswer(ingredientsDto);
}
}
public class TwoIngredientsMultiplicationAnswerChecker : TheAnswerChecker<TwoIngredientsDto>
{
internal override int TheAnswerCheckImplementation(TwoIngredientsDto answerIngredietsDto) //where T : TwoIngredientsDto
{
return answerIngredietsDto.A * answerIngredietsDto.B;
}
}
public class ThreeIngredientsAdditionAnswerChecker : TheAnswerChecker<ThreeIngredientsDto>
{
internal override int TheAnswerCheckImplementation(ThreeIngredientsDto answerIngredietsDto)
{
return answerIngredietsDto.A + answerIngredietsDto.B + answerIngredietsDto.C;
}
}
public class IngredientDto
{
public IngredientDto()
{
Id = Guid.NewGuid();
}
public Guid Id { get; private set; }
}
public class TwoIngredientsDto : IngredientDto
{
public virtual int A {get {return 6;}}
public virtual int B {get {return 7;}}
}
public class ThreeIngredientsDto : TwoIngredientsDto
{
public override int B {get {return 24;}}
public int C {get {return 12;}}
}