[英]Using Code Contracts With Generic Interface With Type Condition
I would like to add code contracts to a generic interface using an abstract class, but where the type parameter is validated. 我想使用抽象类将代码契约添加到通用接口,但是验证了type参数。
Here is an example of what I would like to do: 这是我想做的一个例子:
[ContractClass(typeof(ContractsForIRepository<,>))]
public interface IRepository<T, in TId> where T : IEntity
{
T GetById(TId id);
T Persist(T entity);
void Remove(TId id);
}
[ContractClassFor(typeof(IRepository<,>))]
internal abstract class ContractsForIRepository<T, TId> : IRepository<T, TId>
{
public T GetById(TId id)
{
Contract.Requires(id != null);
return default(T);
}
public T Persist(T entity)
{
Contract.Requires(entity != null);
return default(T);
}
public void Remove(TId id)
{
Contract.Requires(id != null);
}
}
I can easily get it to work by dropping the condition: 我可以通过放弃条件轻松地让它工作:
public interface IRepository<T, in TId> where T : IEntity
public interface IRepository<T, in TId>
But I really want to keep this. 但我真的想保留这个。 Is it possible? 可能吗?
Okay, it is actually trivial - specify the same condition on the abstract class! 好吧,它实际上是微不足道的 - 在抽象类上指定相同的条件!
Full example below. 完整的例子如下。
[ContractClass(typeof(ContractsForIRepository<,>))]
public interface IRepository<T, in TId> where T : IEntity
{
T GetById(TId id);
T Persist(T entity);
void Remove(TId id);
}
[ContractClassFor(typeof(IRepository<,>))]
internal abstract class ContractsForIRepository<T, TId> : IRepository<T, TId> where T : IEntity
{
public T GetById(TId id)
{
Contract.Requires(id != null);
return default(T);
}
public T Persist(T entity)
{
Contract.Requires(entity != null);
return default(T);
}
public void Remove(TId id)
{
Contract.Requires(id != null);
}
}
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