[英]C# dapper map to interface
Can i use C# dapper to do something like this: 我可以使用C#dapper做这样的事情:
IFoo bar = _dbConnection.Query<IFoo>("My query there");
Now I can't do it, due to not impelemented default parameterless constructor. 现在我不能这样做,因为没有必要的默认无参数构造函数。
Is there some trick to honor gods of SOLID (especially spirits of Liskov Substitution Principle) or should i leave it as it is and map my data not to IFoo but to Foo? 是否有一些技巧来尊重SOLID的神(特别是Liskov替换原则的精神)或者我应该保留它并将我的数据映射到IFoo而不是Foo?
I'm really worrying about respecting these SOLID stuff, but still don't know where i should do it, so looking for an advice for this concrete situation. 我真的很担心尊重这些SOLID的东西,但仍然不知道我应该在哪里做,所以寻找这个具体情况的建议。
You need a concrete implementation of your class to instantiate. 您需要实例化类的具体实现。 Internally, it has to do a create a new object. 在内部,它必须创建一个新对象。 You can't create a new instance of an interface: 您无法创建接口的新实例:
var foo = new IFoo(); // This won't build!
You can still cast your result to an interface, but you need a concrete type to build from the database. 您仍然可以将结果转换为接口,但是您需要从数据库构建具体类型。
IEnumerable<IFoo> foo = _dbConnection.Query<Foo>("My query there");
One way to organise repository is to use private class objects for querying, but expose results as public interfaces. 组织存储库的一种方法是使用私有类对象进行查询,但将结果公开为公共接口。
Pulbic Model: Pulbic模型:
namespace MyProject.Foo.Model
{
public interface IFoo
{
string Property1 { get; set; }
string Property2 { get; set; }
}
public interface IFooRepository
{
IEnumerbale<IFoo> GetFoos();
}
}
Query implementation with private class: 使用私有类查询实现:
namespace MyProject.Foo.Repositories
{
public class FooRepository: IFooRepository
{
private class Foo: IFoo
{
public string Property1 { get; set; }
public string Property2 { get; set; }
}
public IEnumerbale<IFoo> GetFoos()
{
IEnumerable<IFoo> foo = _dbConnection.Query<Foo>("My query there");
return foo;
}
}
}
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