C＃如何使用作为通用类的通用方法参数

Question

So I have the following code:

public Dictionary<int, Class1<Class2>> someDictionary;

public T DoThings<T, U>(int id) where T : Class1<U>, new() where U : Class2, new()
{
    T something = null;
    if (!someDictionary.ContainsKey(id))
    {
        something = new T();
        someDictionary.Add(id, something);
    }
    return something;
}

And I am getting this error while trying to add to someDictionary:

Argument 2: Cannot convert from 'T' to 'Class1 < Class2 >'

Any help as to how to solve this, if it even can be solved would be greatly appriciated, thanks.

Luke.

Answer 1

You should declare the generic class.

public class ShouldOneClass<T,U> where T : Class1<U>, new() 
                                 where U : Class2, new()
{
    public Dictionary<int, T> someDictionary;
}

But if you don't want use generic class , replace generics type with interface.