如何有ProblemBase℃的列表; TResult&GT ;? [英] How to have a list of ProblemBase<TResult>?

问题描述

可能重复：结果
的如何创建一个从相同的通用类继承了不同类型的对象的列表？

我使用的，他们是从一个抽象类继承而来的几个对象。但是使用抽象类必须是一个独立宣言通用的数据类型。

I'm using several objects where they are inherited from an abstract class. But to use the abstract class must be declara a generic datatype.

我有问题，因为我需要在这里包含ProblemBase的列表清单，虽然每一个。包含不同的数据类型TResult

I'm having problems because I need to have a list where contains a list of ProblemBase, although each one contains a different TResult datatype.

public abstract class ProblemBase<TResult>
{
    TResult[] Array;
}

和我想要得到Array属性。这就是问题所在。

And I want to get Array property. That's the problem.

推荐答案

这类型的事情发生，我经常。该解决方案我通常一起去是有 ProblemBase℃的基类; T> 是类型分类：

This type of thing happens for me quite often. The solution I typically go with is to have a base class for ProblemBase<T> that is type free:

public abstract class ProblemBase
{
    public abstract object Result { get; }
}

public abstract class ProblemBase<TResult> : ProblemBase
{
    public override object Result
    {
        get { return Result; }
    }

    new public TResult Result { get; private set; }
}

当你需要的问题的集合，那么，你可以做一个集合的 ProblemBase 没有泛型。

如果 TResult 有其自身需要的继承层次结构，那么你可以这样做，而不是：

If TResult has its own required inheritance hierarchy, then you can do this instead:

public abstract class ProblemBase
{
    public abstract ResultBase Result { get; }
}

public abstract class ProblemBase<TResult> : ProblemBase
    where TResult : ResultBase
{
    public override ResultBase Result { get { return Result; } }
    new public TResult Result { get; private set; }
}

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