[2.0] Easy way to identify a class with versions?

So I have classes that are for different versions and have like like.

csharp Code:

interface TheInterface
{
    void AFunc();
}
 
//Version 1 uses this
class ClassA : TheInterface
{
    void AFunc()
    {
        //stuff here
    }
}
//Version 2 uses this
class ClassB : TheInterface
{
    void AFunc()
    {
        //stuff here
    }
}
//etc

I want to easily use the different classes based on a string.

Currently I am doing

csharp Code:

string ver = "1.0";
TheInterface inter;
if (ver == "1.0")
inter = (TheInterface)ClassA;
else if (ver == "2.0")
inter = (TheInterface)ClassB;
else
//unsupported

Is there a neater way of doing that?

Different versions of what? If we don't know what it's supposed to represent we can't really say whether there's a better way to represent it.

Well the class processes a file which is processed differently for each version.

I was thinking of something like.

csharp Code:

class ClassVersion
{
    TheInterface TheClass;
    string version;
    public version(string ver,TheInterface theclass)
    {
        TheClass = theclass;
        version = ver;
    }
}
 
ClassVersion[] Versions = {
new ClassVersion("1.0",ClassA),
new ClassVersion("2.0",ClassB),
};
 
void Process(string ver)
{
    for(int i = 0;i < Versions.Length; i++)
    {
        if (Versions[i].Version = ver)
        {
            Versions[i].TheClass.AFunc();
            break;
        }
    }
}

I don't think there really is an elegant way to do this. Your original idea looks as good as anything to me. That second code snippet looks a bit convoluted and it also would require you to create processing class instances that may not get used.