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C# how to access one class/object across entire application.

Posted on 2011-02-26
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Last Modified: 2014-11-12
I have an C# application written for Windows Phone 7 and I have multiple classes. I have created a singleton class for logging and I would like to Instantiation the logger class one time and use that instance throught out the application even as other classes come and go. I am not sure where in the application to create this object that I would be sure that it will stay 'alive' and be acceptible by all other classes during runtime.

Examples help the best.

Thank You
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Question by:atomicgs12
7 Comments
 
LVL 2

Expert Comment

by:Raymond-Holmboe
ID: 34991241
That is the purpose of a singleton, it creates just one instance that is alive "forever". Normally you dispose your singletons at app exit, if you need to.
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Expert Comment

by:fromer
ID: 34991308
   public sealed class Logger
    {
        public static readonly Logger Instance = new Logger();
        private List<string> Logs;
        private Logger()
        {
            Logs = new List<string>();
        }
        public void AddLog(string log)
        {
            Logs.Add(log);
        }
    }
    public class Class1
    {
        public Class1()
        {
            Logger.Instance.AddLog("Class1 constructor");
        }
    }
    public class Class2
    {
        public Class2()
        {
            Logger.Instance.AddLog("Class2 constructor");
        }
    }

0
 

Author Comment

by:atomicgs12
ID: 34992965
fromer:

Is there some where in the application that one could declare Logger.Instance as a global so the code doesn't have Logger.Instance.AddLog all over the place? Like some where on startup declare a global, g_Logger = Logger.Instance;, then throught out the code just write g_Logger.AddLog("test");. Better yet I'd like to be able just to write AddLog("test") where needed.

Thanks
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LVL 4

Accepted Solution

by:
fromer earned 500 total points
ID: 34995079
There is no such thing in c#, since every variable must be declared as a class member, or in a method..
my suggesstion is:

public static class g_Logger
{
  public static void AddLog(string log)
  {
    Logger.Instance.AddLog(log);
  }
}

You can't do more than this in c#...
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Author Comment

by:atomicgs12
ID: 35004025
So then it would be g_Logger.AddLog("test");
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LVL 16

Expert Comment

by:hjgode
ID: 39626909
This question has been classified as abandoned and is closed as part of the Cleanup Program. See the recommendation for more details.
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