Out requires the parameter to be set within the method, you would
probably want to use 'ref' in this case since you want to check the
value before deciding to set it.
class Program
{
static void Main(string[] args)
{
MyStateEnum enState = MyStateEnum.START_STATE;
ChangeToState1(ref enState);
if (enState == MyStateEnum.START_STATE)
Console.WriteLine("The state didn't change!!!");
else
Console.WriteLine("The state did change!!!");
Console.WriteLine("Press <Enter> to Exit...");
Console.ReadLine();
}
static void ChangeToState1(ref MyStateEnum enState)
{
if( enState == MyStateEnum.START_STATE )
enState = MyStateEnum.STATE1;
}
}
-----Original Message-----
From: Discussion of advanced .NET topics.
[mailto:[EMAIL PROTECTED] On Behalf Of Eddie Lascu
Sent: Wednesday, July 12, 2006 11:14
To: [email protected]
Subject: Passing value parameters in VS2005 / .NET 2.0
Consider this:
using System;
using System.Collections.Generic;
using System.Text;
namespace TestOutParameterBehavior
{
public enum MyStateEnum
{
START_STATE = 0,
STATE1 = 1,
STATE2 = 2,
END_STATE
}
class Program
{
static void Main(string[] args)
{
MyStateEnum enState = MyStateEnum.START_STATE;
ChangeToState1(out enState);
if (enState == MyStateEnum.START_STATE)
Console.WriteLine("The state didn't change!!!");
else
Console.WriteLine("The state did change!!!");
Console.WriteLine("Press <Enter> to Exit...");
Console.ReadLine();
}
static void ChangeToState1(out MyStateEnum enState)
{
if( enState == MyStateEnum.START_STATE )
enState = MyStateEnum.STATE1;
}
}
}
Why is it that I cannot test the value of my enumeration variable before
I assign to it? This small test app doesn't compile and the errors I am
getting are:
1. Use of unassigned out parameter 'enState'; 2. The out parameter
'enState' must be assigned to before control leaves the current method;
Obviously, I need to use 'out' parameters, because enumerations are
value types and I need to preserve the changes done in the
ChangeToState1 method.
Am I missing something? Clearly this wasn't the case in VS2003 / .NET
1.1. I would understand the environment generating a warning in my case,
but an error? It's like I need to assign the out parameter no matter
what. Well, in some cases (decided by the 'if' test) I don't want to do
the assignment.
Regards,
Eddie
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