将通用类型列表转换为特定类型列表

Question

I have a generic method 'GetSomeData' that returns a list. I can be a list of int, double, uint...

public void GenericMethod<T>()
{
   List<T> genericList = GetSomeData<T>();
   List<double> castedList1 = (List<double>) genericList;
   List<double> castedList2 = genericList.Cast<double>();  //Not working
   List<double> castedList3 = genericList.Select(f => (double)f).ToList(); //not working
}

T can be int, uint, double...

Is there a way to cast this list?

Answer 1

尝试这个 ：

List<double> castedList3 = genericList.OfType<double>().ToList();

Answer 2

This works fine, but may have runtime exceptions if T can't be casted to double

public void GenericMethod<T>() where T : struct
{
   List<T> genericList = GetSomeData<T>();

   IList<double> doubleList = genericList.Select(val => Convert.ToDouble(val))
                                         .ToList();
}