将构造函数传递到基类构造函数中

Question

I have a base class that needs to initialize a variable that will change depending on which child is calling the constructor. So,

public class TestClass<T> {
    T variable;
    string parameter;

    public TestClass(passed_in_constructor) {
        variable = passed_in_constructor(parameter);
    }
}

How do I do this?

EDIT: Let me rephrase the question. Below is an alternate way of doing what I am trying to do and I can better explain the error and the problem

I currently have the following class:

public class Test<T> {
    SqlConnection conn;
    T genericGuy;

    public Test() {
        conn = ...this is initialized properly
        genericGuy = (T)Activator.CreateInstance(typeof(T), sqlConn);
    }
 }

When I run this however, I am getting an Error. My 'T' is actually an interface and so the error says that there is no constructor defined in this interface.

I want the constructor under the interface to get called though...how can I do this?

Answer 1

Pass a Func . Let the child decide what to do with that variable:

class Foo<T>
{
    T variable;
    string parameter;

    public Foo(Func<string, T> action)
    {
        variable = action(parameter);
    }
}