C # Generic Class <T>

Question

C # Generic Class <T>

How do I add a shared list to my list? I tried to create a T object, but that doesn't work either.

class Bar<T> where T : IDrink
{
    List<T> storage = new List<T>();

    public void CreateDrink()
    {
        storage.Add(T); //<- This doesn't work
    }
}

+3

list generics c # class add

Danixo 15 jul. 15 at 9:58 am

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2 answers

You can do it like:

storage.Add(Activator.CreateInstance<T>());

+3

Andy Korneyev 15 jul. '15 at 10:00

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Tim Schmelter · Accepted Answer · 2015-07-15T10:02:36+0000

T

is a type that is not an instance of that type. So you need a parameter in, CreateDrink

or use a factory method that returns a new instance T

.

If you want to instantiate the general constraint should include new()

class Bar<T> where T : IDrink, new()
{
    List<T> storage = new List<T>();

    public void CreateDrink()
    {
        storage.Add(new T()); 
    }
}

The new constraint specifies that any type argument in a generic class declaration must have a public, parameterless constructor. Use a new constraint, the type cannot be abstract.

C # Generic Class <T>

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