C#

blackjack2150 wrote:

Properties are just a fancy way to ease the use of get and set methods, as they give you the illusion of accessing the memeber variable directly.

public class A {

	public void SetToNull() {
	  //this object is null
	  //but how do you do this
	}

}

public class A {

	public void SetToNull() 
	{
	  //this object is null
	  //but how do you do this
	}

}

public class B {

	public A a = new A();

	public void SetToNull() 
	{
	  a = null;
	}

}

public class A {

	public void SetToNull() 
	{
	  //this object is null
	  //but how do you do this
	}

}

public class B {

	public A a = new A();
	public void SetToNull() 
	{
	  a.SetToNull();
	}

}

    Nullable A=new Nullable();
    a.NullifyMyRef(ref a);
    a.Something();    // NullPointerException !

class Nullable {
    public void NullifyMyRef(object ref obj) {
        obj=null;
    }
}

Matglas wrote:

I need to have a object set itself to null. Is this in any way possible?

MyObject obj = new MyObject();
...
obj.DoSomeOperationThatSetsObjToNull();
Assert.IsNull(obj);

public class Document : ITreeView
{
    public Document() { }

    private PageCollection _pages = new PageCollection();
    [XmlElement(ElementName = "page")]
    public PageCollection Pages
    {
        get { return _pages; }
        set { _pages = value; }
    }

    #region public methods
    public Document Deserialize(string file)
    {
        //..
    }
    public void Serialize(string file, Document doc)
    {
        //...
    }
    #endregion

    #region ITreeView Members

    public ContextMenu GetContextMenu()
    {
        ContextMenu docContext = new ContextMenu();

        //...

        return docContext;
    }
    public ObjectTreeNode GetTreeNode()
    {
        return new ObjectTreeNode(this, "document", 0, 0);
    }

    #endregion
}

public class Page : ITreeView
{
    public Page() { }

    #region properties
    //...
    #endregion

    #region ITreeView Members

    public ObjectTreeNode GetTreeNode()
    {
        return new ObjectTreeNode(this, "page " + _pagenumber, 0, 0);
    }

    public System.Windows.Forms.ContextMenu GetContextMenu()
    {
        ContextMenu pageContext = new ContextMenu();

        MenuItem delItem = new MenuItem("Delete", new EventHandler(DeletePage));
        pageContext.MenuItems.Add(delItem);

        return pageContext;
    }
    public void DeletePage(object sender, EventArgs e)
    {
        //delete this page
    }

    #endregion
}

ATCsharp wrote:

I have many user controls on a single form that each present different data. This is a small utility that displays the status of different applications and systems. Each user control, as of now, has two threads. 1 thread will update the data source and the other thread will update the user interface.

Software_Specialist wrote:

i tried this out but i am getting exception at the moment.