泛型类型的集合 [英] Collection of generic types

问题描述

如果我有一个泛型类：

public class MyClass<T> 
{
  public T Value;
}

我要实例的几个项目，如...

I want to instantiate several items such as...

new MyClass<string>
new MyClass<int>

...，并将它们添加到集合。我如何定义集合，以便它可以容纳泛型类型的列表？然后，我想在某个时候通过收集迭代，并使用Value属性。可能？

...and add them to a collection. How do I define the collection so that it can hold a list of generic types? I then want to iterate through the collection at some point, and use the Value property. Possible?

推荐答案

有从非通用基的泛型类继承，或实行非通用接口。然后你就可以有这种类型的集合，无论$ C $内施放c您用来访问集合的内容。

Have your generic class inherit from a non-generic base, or implement a non-generic interface. Then you can have a collection of this type and cast within whatever code you use to access the collection's contents.

下面是一个例子。

public abstract class MyClass
{
    public abstract Type Type { get; }
}

public class MyClass<T> : MyClass
{
    public override Type Type
    {
        get { return typeof(T); }
    }

    public T Value { get; set; }
}

// VERY basic illustration of how you might construct a collection
// of MyClass<T> objects.
public class MyClassCollection
{
    private Dictionary<Type, MyClass> _dictionary;

    public MyClassCollection()
    {
        _dictionary = new Dictionary<Type, MyClass>();
    }

    public void Put<T>(MyClass<T> item)
    {
        _dictionary[typeof(T)] = item;
    }

    public MyClass<T> Get<T>()
    {
        return _dictionary[typeof(T)] as MyClass<T>;
    }
}

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