using variables to call variables

Question

hi how to I do the below?

int z = 1;
string one = "pc";
string two = z.ToString();
                    //what goes here
Console.Write("Host One:\tSent-{0}\tSuccess-{1}\tFail-{2}", xxxxx.numepings, pc1.numepings_s, pc1.numepings_f);
Console.WriteLine();

so in my code pc1 is an instance of an object, what can i use in the line //what goes here and then in place of the xxxxx so that I can call the instance from the concanatated string variable pc and int 1 ??

"pc1" is an instance of an object - No, instances do not have names. pc1 is a reference variable that happens to point to a particular instance. — Henk Holterman
– Henk Holterman, Commented Mar 26, 2012 at 15:06
I'm sorry, I totally don't understand your question. What are you trying to achieve here, and why? What have the variables z, one and two got to do with anything? — Shaul Behr
– Shaul Behr, Commented Mar 26, 2012 at 15:07

Jon Skeet · Accepted Answer · 2012-03-26 15:05:24Z

5

Basically, you don't. You can potentially use reflection, but it's a bad idea. Instead, you should use a collection whenever you want to store references to multiple objects and address them by some sort of key (whether that's an index, a name, whatever).

So instead of having:

Foo pc0;
Foo pc1;
Foo pc2;
...

You would have:

List<Foo> pcs;
...
Foo pc = pcs[z];

answered Mar 26, 2012 at 15:05

Jon Skeet

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5 Comments

DevilWAH Over a year ago

mmmm I remember some thing like this in VBA, but that was a while ago, need to go take a look.

Steve Wellens Over a year ago

And if you want to access the objects by a string label/tag instead of an index, use a Dictionary instead of a List.

Jon Skeet Over a year ago

@DevilWAH: Yes, you may well be able to do it from VBA - that doesn't mean you should, or that you can use the same idiom in C#.

DevilWAH Over a year ago

I mean the method of using a list to hold the refrences :) I jsut forgot I had done it before

Jon Skeet Over a year ago

@DevilWAH: Ah, I see. Yes, I'd certainly expect that to be possible in VBA too :)

Dave Bish · Accepted Answer · 2012-03-26 15:21:49Z

0

See here: http://msdn.microsoft.com/en-us/library/1fce0hc8.aspx

// Create an instance of the SomeType class that is defined in this 
// assembly.
var oh = Activator.CreateInstanceFrom(Assembly.GetEntryAssembly().CodeBase, one + z /* as a  full type name */);

// Call an instance method defined by the SomeType type using this object.
dynamic st = oh.Unwrap();

st.DoSomething(5);

You can do something like this to create an object, from it's string name - but you can't cast it to a particular type without issues.

You can cheat, and use dynamic though.

Edit: sorry, this wasn't quite right originally - and I have fixed my example.

edited Mar 26, 2012 at 15:21

answered Mar 26, 2012 at 15:08

Dave Bish

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3 Comments

Avner Shahar-Kashtan Over a year ago

While this answers the literal question posted, I think this is bad advice to give.

Dave Bish Over a year ago

I see that this might not be the best answer, given Jons reply - but it is still an answer to the question asked, explicitly.

Dave Bish Over a year ago

Hah - agreed. :) - But it may come in handy for someone searching for an answer to a similar issue, that can't benefit from the above advice.

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