Question

Reproduction:

Snippet 1:

class A{
   A(int i){}
   A(string s){}
   A(Form b){}
   A(Stream b){}
   //...more constructors but no one accepts object type
}

Snippet 2:

A assign(object obj)
{
    dynamic d=obj;
    //do something with d or obj?
    A a=new A(d);
    return a;
}

How to make the line A a=new A(d); working?

Edit:

How to make the line A a=new A(d); working without dynamic type mechanism?

Answer 1

Add A(object obj){}

To A’s constructor, then use GetType() to identify it.

        public A(object obj)
        {
            if(obj is int)
                //Do something with the int.
            if(obj is string)
                //Do something with the string.
            if(obj is Form)
                //Do something with the Form.

            //etc...        
        }