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Casting a ref variable..

Posted on 2003-11-05
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Last Modified: 2010-04-16
Hi,

I wanted to cast a reference to another type..
I have a class Port which implements IPortInput ..

My current variable is : IPortInput anInputPort;

And I have a method as follows: public void Test(ref Port){}

So if I want to call this method by passing a reference of anInputPort (IPortInput) as a type Port instead of type IPortInput which requires casting how can I do that?

Since casting directly by using (Port) ref anInputPort or ref (Port) anInputPort doesnt work..

Can someone give me an example please. Thanks..
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Question by:heboh
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2 Comments
 
LVL 15

Accepted Solution

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SRigney earned 50 total points
ID: 9692039
Why is your current variable
IPortInput anInputPort?

Don't you want to create a main variable of the specific type and the interface is only used by functions that require interface only functionality?

In any case doing something like this should work.
IPortInput anInputPort = new Port();

Port PortToSend = (Port)anInputPort;
Test(ref PortToSend);


If you want to do it within the function call you probably need another layer of parenthesis.  I didn't test this, so I'm not sure if it will work.

Test(ref ((Port) anInputPort));

Good Luck, let me know how it goes.
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Expert Comment

by:ptmcomp
ID: 9702866
Why are you passing it as a reference?? There is usually no sense to do this. If you need to change it then return the changed value.

public Port Test(IPortInput anInputPort)
{

}
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