How to make a per-document variable with .net?

James Maeding

On the autocad side, a variable will be global to a document, unless declared as static. Static cars are global to all docs. 

On the bricscad side, it seems a static variable is still global to all docs, but a non-static var is not global to anything.

Use this test code to see (from Kean's blog...):

public class SecondClass {
//if this var is static, it affects all sessions
private int counter1 = 0;
private static int counter2 = 0;

[CommandMethod("loc")]
public void local() {
Editor ed = AcAp.DocumentManager.MdiActiveDocument.Editor;
ed.WriteMessage("\nCounter value is: " + counter1++);
}

[CommandMethod("loc2")]
public void local2() {
Editor ed = AcAp.DocumentManager.MdiActiveDocument.Editor;
ed.WriteMessage("\nCounter value is: " + counter2++);
}
}

When I run the loc command in bcad, its 0 every time.

In acad, it counts up from 0, and starts over in each doc as its nont static.

How would I make a vra global to each doc, not all docs?

James Maeding

meant "Static vars are global to all docs."...

Its_Alive

[code]

namespace BrxMgdTestCs
{
    public class PersistedClass
    {
        public int val;

        public PersistedClass()
        {
            val = 0;
        }
    }
    public class Commands : IExtensionApplication
    {
        public void Initialize()
        {
        }

        public void Terminate()
        {
        }

        [CommandMethod("doit")]
        public static void doit()
        {
            Document doc = AcAp.Application.DocumentManager.MdiActiveDocument;
            PersistedClass pclass = new PersistedClass();
            pclass.val = doc.Editor.GetInteger("Enter a number").Value;
            doc.UserData.Add(typeof(PersistedClass), pclass);

        }

        [CommandMethod("getit")]
        public static void getit()
        {
            Document doc = AcAp.Application.DocumentManager.MdiActiveDocument;
            if(doc.UserData.ContainsKey(typeof(PersistedClass)))
            {
                PersistedClass pclass = doc.UserData[typeof(PersistedClass)] as PersistedClass;
                doc.Editor.WriteMessage(pclass.val.ToString());
            }
        }
    }
}
 [/code]

Its_Alive

namespace BrxMgdTestCs
{
    public class PersistedClass
    {
        public int val;

        public PersistedClass()
        {
            val = 0;
        }
    }
    public class Commands : IExtensionApplication
    {
        public void Initialize()
        {
        }

        public void Terminate()
        {
        }

        [CommandMethod("doit")]
        public static void doit()
        {
            Document doc = AcAp.Application.DocumentManager.MdiActiveDocument;
            PersistedClass pclass = new PersistedClass();
            pclass.val = doc.Editor.GetInteger("Enter a number").Value;
            doc.UserData.Add(typeof(PersistedClass), pclass);
        }

        [CommandMethod("getit")]
        public static void getit()
        {
            Document doc = AcAp.Application.DocumentManager.MdiActiveDocument;
            if(doc.UserData.ContainsKey(typeof(PersistedClass)))
            {
                PersistedClass pclass = doc.UserData[typeof(PersistedClass)] as PersistedClass;
                doc.Editor.WriteMessage(pclass.val.ToString());
            }
        }
    }
}

Its_Alive

Of course you can use any type for the key , object.  It could just as well be:
doc.UserData.Add(String, int);
The plus side of using Document.UserData, is that it easy to get the values for any document  from any command and or class

UserData is a HashTable

Cheers

Kerry Brown

 

The ubiquitous DOIT command strikes again

Best wishes for a safe holiday guys.

Regards,

Its_Alive

@Kerry Brown:

 

The ubiquitous DOIT command strikes again

Best wishes for a safe holiday guys.

Regards,

Lol, I wonder how many doit functions I have out there : )

Best wishes to you and family as well : )

Its_Alive

more fun

namespace BrxMgdTestCs
{
    public class PersistedClass
    {
        public int val;
        public PersistedClass()
        {
            val = 0;
        }
        public void DoSomething()
        {
            Document doc = AcAp.Application.DocumentManager.MdiActiveDocument;
            doc.Editor.WriteMessage(val.ToString());
        }
    }
    public class Commands
    {
        [CommandMethod("doit")]
        public static void doit()
        {
            PersistedClass pclass = null;
            Document doc = AcAp.Application.DocumentManager.MdiActiveDocument;
            if (doc.UserData.ContainsKey(typeof(PersistedClass)))
            {
                pclass = doc.UserData[typeof(PersistedClass)] as PersistedClass;
            }
            else
            {
                pclass = new PersistedClass();
                doc.UserData.Add(typeof(PersistedClass), pclass);
            }
            if (pclass != null)
            {
                pclass.val++;
                pclass.DoSomething();
            }
        }
    }
}

James Maeding

so doc.userdata is the only way? Its funny because is the acad behavior of non-static vars correct, or bcad?

It does not matter, I have to choose a method that works for both as I want one codeset with as few #if forks as possible.

Thanks for the responses - with example code no less, much appreciarted.