How can I define a constructor in an open generic type?

I am trying to create on open gen开发者_如何学Pythoneric type that has a constructor to be used by derived types, but I either don't know how to do it or it is not possible -- not sure which.

 public struct DataType<T> : IDataType {

    private T myValue;
    private TypeState myState;

    internal DataType<T>(T initialValue, TypeState state) {
        myValue = initialValue;
        myState = state;
    }
 }

Any help much appreciated!

Cort

EDIT: the constructor was originally posted as private, which was in error and should have been protected. BUT -- protected is not allowed in a struct, so I changed it to internal.

---

The constructor doesn't have a generic argument, just like any normal method of the class which can use T but isn't generic either.

public class DataType<T> : IDataType {

    private T myValue;
    private TypeState myState;

    protected DataType(T initialValue, TypeState state) {
        myValue = initialValue;
        myState = state;
    }
 }

Note that structs cannot be inherited, and private constructors cannot be called by inheriting classes. Change those two as well in order to get it working.

---

private DataType(T initialValue, TypeState state)
{
     myValue = initialValue;
     myState = state;
}