C＃是否可以将Class类型作为参数传递给Function并访问方法内部的类变量

Question

Assume there's a base class

class base
{
  int x, y;
}

And 3 derived singleton classes A, B, C with x, y initialized to some value.

example :

class A : base { x = 1; y = 0;}
class B : base { x = 0; y = 1;}    
class C : base { x = 1; y = 1;}

Is there a way to Pass class as parameter to method and access that class's variable value. SO, One function that can update values for all 3 classes.

Intention :

int call (type classtype)
{
   int xvalue = classtype.x;
   int yvalue = classtype.y;
}

I've seen in some posts a mention of activator.CreateInstance(classtype) in How to pass a Class as parameter for a method? [duplicate]

But it doesn't answer how we can access variables of that class.

Answer 1

Your method needs to accept the Type and then you can access static properties because you don't have the instance.

int Call(Type classType)
{
   var xvalue = (int)classType.GetProperty("x", BindingFlags.Public | BindingFlags.Static).GetValue(null, null);
   var yvalue = (int)classType.GetProperty("y", BindingFlags.Public | BindingFlags.Static).GetValue(null, null);
}

Although I have a feeling what you're really looking for is just simple inheritance or an interface as your parameter.

Answer 2

You could change Call to accept the base class that A,B,C derives from:

int Call(base theClass)
{
    if (theClass is A)
    {
        var ax = theClass.x;
        var ay = theClass.y;
    }
    else if (theClass is B)
    {
        // etc       
    }
    // etc
}