C＃实例从反映类型泛型列表 [英] C# instantiate generic List from reflected Type

问题描述

是否有可能从在C＃反射型（.NET 2.0）创建一个通用对象？

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
    //...
}

本型，T，不知道到运行时。

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);
}

现在做什么用实例？因为你不知道你的列表的内容的类型，可能是你能做的最好的事情将是投实例为的IList ，这样你可以有不只是一个对象以外的东西：

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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