C# 从反射类型实例化泛型列表 [英] C# instantiate generic List from reflected Type

问题描述

是否可以从 C# (.Net 2.0) 中的反射类型创建通用对象?

Is it possible to create a generic object from a reflected type in C# (.Net 2.0)?

void foobar(Type t){
    IList<t> newList = new List<t>(); //this doesn't work
    //...
}

直到运行时才知道类型 t.

The Type, t, is not known until runtime.

推荐答案

试试这个:

void foobar(Type t)
{
    var listType = typeof(List<>);
    var constructedListType = listType.MakeGenericType(t);

    var instance = Activator.CreateInstance(constructedListType);
}

现在如何处理instance?由于您不知道列表内容的类型，因此您能做的最好的事情可能是将 instance 转换为 IList 以便您可以拥有除只是一个 object:

Now what to do with instance? Since you don't know the type of your list's contents, probably the best thing you could do would be to cast instance as an IList so that you could have something other than just an object:

// Now you have a list - it isn't strongly typed but at least you
// can work with it and use it to some degree.
var instance = (IList)Activator.CreateInstance(constructedListType);

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