how to add a class<int>instance，add to Class<string>instance

Question

interface IA<T>
{T Value;}

Class A<T> : IA
{
  T Value;
  public A<T> saveClassA;
}

var A1= new A(123);
var A2 = new A("hihi");
A1.saveClassA = A2;

ERROR:Unable to cast object of type 'Developer.Test.DProperties1[System.String]' to type 'Developer.Test.DProperties1[System.Int32]'.

I need to store A2 in A1. So in future A1 changed, A2 can be notified. I got a mismatch error. How to do this.....

Class<int>, cast to Class<string>? do you know how to cast the class? the problem is class<T> and <T>can be anything, <string><bool><>..... — lincncn
– lincncn, Commented Mar 26, 2017 at 16:33
Even I changed (public A<T> saveClassA) to (public object saveClassA), I cannot Add (object)A2 to A1. — lincncn
– lincncn, Commented Mar 26, 2017 at 16:35

Aleksei · Accepted Answer · 2017-03-26 16:37:13Z

0

You may define your classes in the following way:

Class B<T> : IA<T>
{
  T Value;
}

Class A<T1, T2> : IA<T1>
{
  T1 Value;
  public B<T2> saveClassA;
}

var A1= new A<int, string>(123);
var B2 = new B<string>("hihi");
A1.saveClassA = B2;

answered Mar 26, 2017 at 16:37

Aleksei

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1 Comment

lincncn Over a year ago

Thanks, I will try!

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