在运行时决定类型和泛型类型应用它 - 我该怎么办呢？ [英] Deciding on type in the runtime and applying it in generic type - how can I do this?

问题描述

我想创建一个强类型列表，并决定在运行时的类型。这是我的code.I认为它应该工作，但它不会:)

I would like to create a strongly type list and decide the type in runtime. This is my code.I thought it should work, but it doesn't :)

        Type elementType = Type.GetType(parts[0].Trim(),false,true);
        var elementsBeingSet = new List<elementType>();

请问您有什么ideat如何创建一个强类型的列表，它的类型，我会在运行时决定？

would you have any ideat how to create a strongly typed list whose type I will decide in runtime ?

复制：这里有其他的版本：

Duplicate: here are other versions:

• http://stackoverflow.com/questions/234008/is-it-impossible-to-use-generics-dynamically


• http://stackoverflow.com/questions/307984/declare-a-generic-type-instance-dynamically


• http://stackoverflow.com/questions/325156/calling-generic-method-with-a-type-argument-known-only-at-execution-time

推荐答案

使用 Type.MakeGenericType（类型[]）：

Type elementType = GetElementType(); // get this type at runtime
Type listType = typeof(List<>);
Type combinedType = listType.MakeGenericType(elementType);
IList elements = (IList) Activator.CreateInstance(combinedType);

您必须使用的IList 来保持的结果 - 因为你不知道会在运行时使用的实际类型

You have to use IList to keep the result - because you don't know the actual type that will be used at runtime.

有关泛型类型的，你会使用类似词典＆LT多个类型的参数;，＆GT;

For generic types with more than one type parameter you would use something like Dictionary<,>.

又见<一个href=\"http://msdn.microsoft.com/en-us/library/system.type.makegenerictype.aspx\">http://msdn.microsoft.com/en-us/library/system.type.makegenerictype.aspx

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