C#从反射的Type中实例化通用List

Question

是否可以从C#(.Net 2.0)中的反射类型创建通用对象？

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

Type,t,直到运行时才知道.

Answer 1

试试这个:

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

    var instance = Activator.CreateInstance(constructedListType);
}

现在该怎么办instance？由于您不知道列表内容的类型,因此您可以做的最好的事情就是将其转换instance为IList以下内容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);

Answer 2

static void Main(string[] args)
{
  IList list = foobar(typeof(string));
  list.Add("foo");
  list.Add("bar");
  foreach (string s in list)
    Console.WriteLine(s);
  Console.ReadKey();
}

private static IList foobar(Type t)
{
  var listType = typeof(List<>);
  var constructedListType = listType.MakeGenericType(t);
  var instance = Activator.CreateInstance(constructedListType);
  return (IList)instance;
}