Dynamically access objects

Question

Let's say I have 2 objects ObjAand ObjB. Assuming they are from the same class with a method called CommonMethod(), I am looking for a way to do something like this:

void CallObjectMethod(string name)
{
    // where name could be 'A' or 'B'
    (Obj + name).CommonMethod();
}

instead of a long way:

void CallObjectMethod(string name)
{
    if(name == 'A')
        objA.CommonMethod();
    else if(name == 'B')
        objB.CommonMethod();
}

I understand that this can be done through reflection, but I'm not quite sure how to achieve this.

Answer 1

Assuming that ObjAboth ObjBhave a class SomeClassand are fields (member variables) this, you can use the following. If the caller supplies the wrong suffix (for example, not “A”, not “B”), the method will throw an exception, of course.

class Example
{
    private SomeClass ObjA;
    private SomeClass ObjB;

    void CallObjectMethod(string suffix)
    {
        string name = "Obj" + suffix;
        var fieldInfo = this.GetType().GetField(name, BindingFlags.Instance | BindingFlags.NonPublic);
        if (fieldInfo == null || (fieldInfo.FieldType != typeof(SomeClass)) throw ArgumentException(nameof(suffix));
        SomeClass obj = fieldInfo.GetValue(this) as SomeClass;
        obj.CommonMethod();
    }
}

. , , . , , . , , , :

class Example
{
    Dictionary<string, SomeClass> _objects = new Dictionary<string, SomeClass>();

    public SomeClass()
    {
        _objects["A"] = new SomeClass();
        _objects["B"] = new SomeClass();
    }

    void CallObjectMethod(string key)
    {
        _objects[key].CommonMethod();
    }
}

Answer 2

<string, Obj>, :

void CallObjectMethod(string name)
{
   Obj ObjFromDictionary = MyDictionary[name];
   ObjFromDictionary.CommonMethod();
}

, , , Obj ObjFromDictionary...

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