Serialization Problem - REPOST - PLEASE PLEASE HELP!

[Johnny J.]

I posted this last week, but didn't get any reply. I'm trying again now,
because I'm getting desperate - I've tried everything I can think of myself.
PLEASE help somebody.

I've made an inherited ListView control with a customized ColumnHeader Type.
I've overwritten the Columns property with a collection of my custom
ColumnHeader items. Now I would like to implement serialization so that
columns are persisted from designtime to runtime. But I cannot get it to
work.

I think it's because I don't know how to implement the type converter
correctly. Here's my suggestion for the type converter. Sample code for the
ListView, ColumnHeaderCollection and ColumnHeaderItem is supplied below. Can
anybody tell me what's wrong?

I've got a small test project (C# 2005) that I've stripped of everything but
the important part (the collection) - I cannot get the serialization to
work. I add columns at designtime, but no matter what, the columns are not
persisted to runtime. If anybody has got the time to help me, I can mail the
test project. I would REALLY appreciate any help.

Cheers, Johnny J.

public class MyListViewColumnConverter : TypeConverter
{
public override bool CanConvertTo
(ITypeDescriptorContext context, Type destinationType)
{
if (destinationType == typeof(InstanceDescriptor))
{
return true;
}
return base.CanConvertTo(context, destinationType);
}
public override object ConvertTo(ITypeDescriptorContext context, CultureInfo
culture, object value, Type destinationType)
{
if (destinationType == typeof(InstanceDescriptor) && value is
MyListViewColumn)
{
MyListViewColumnitem = (MyListViewColumn)value;
ConstructorInfo ci = typeof(MyListViewColumn).GetConstructor(new Type[]
{ });
if (ci != null)
{
return new InstanceDescriptor(ci, null, false);
}
}
return base.ConvertTo(context, culture, value, destinationType);
}
}

************************************************** ********
Listview, ColumnheaderCollection, ColumnHeaderItem code:
namespace MyListView
{
public class MyListView : ListView
{
private MyColumnHeaderCollection myListViewColumnHeaders = null;
public MyListView()
{
myListViewColumnHeaders = new MyColumnHeaderCollection(this);
//Other Code
}
public MyListView(IContainer container)
{
myListViewColumnHeaders = new MyColumnHeaderCollection(this);
container.Add(this);
//Other Code
}
[Localizable(true)]
[DesignerSerializationVisibility(DesignerSerializat ionVisibility.Content)]
[Editor("System.Windows.Forms.Design.ColumnHeaderCo llectionEditor,
System.Design, Version=2.0.0.0, Culture=neutral,
PublicKeyToken=b03f5f7f11d50a3a", typeof(UITypeEditor))]
[MergableProperty(false)]
public new MyColumnHeaderCollection Columns
{
get { return myListViewColumnHeaders; }
}
//Other Code
}
[DesignTimeVisible(false)]
public class MyColumnHeaderCollection : ListView.ColumnHeaderCollection
{
private SortedList columnList = new SortedList();
public new MyListViewColumn this[int index]
{
get
{ return (MyListViewColumn)columnList.GetByIndex(index); }
}
public override ColumnHeader Add(string str, int width, HorizontalAlignment
textAlign)
{
MyListViewColumn column = new MyListViewColumn(str, width, textAlign);
this.Add(column);
return column;
}
public override int Add(ColumnHeader column)
{
return this.Add(new MyListViewColumn(column));
}
public override void AddRange(ColumnHeader[] values)
{
for (int index = 0; index < values.Length; index++)
{
this.Add(new MyListViewColumn(values[index]));
}
}
public int Add(MyListViewColumn column)
{
int retValue = base.Add(column);
columnList.Add(column.ColumnID, column);
return retValue;
}
public new void Remove(ColumnHeader column)
{
base.Remove(column);
columnList.Remove(((MyListViewColumn)column).Colum nID);
}
public new void RemoveAt(int index)
{
ColumnHeader column = this[index];
this.Remove(column);
}
public new void Clear()
{
base.Clear();
columnList.Clear();
}
}
[DesignTimeVisible(false)]
[TypeConverter(typeof(MyListViewColumnConverter))]
public class MyListViewColumn : ColumnHeader
{
private int m_ColumnID = 0;
private static int autoColumnID = 0;
public MyListViewColumn()
{
Initialize("", 60, HorizontalAlignment.Left);
}
public MyListViewColumn(string str, int width, HorizontalAlignment
textAlign)
{
Initialize(str, width, textAlign);
}
public MyListViewColumn(ColumnHeader column)
{
Initialize(column.Text, column.Width, column.TextAlign);
}
private void Initialize(string str, int width, HorizontalAlignment
textAlign)
{
base.Text = str;
base.Width = width;
base.TextAlign = textAlign;
m_ColumnID = autoColumnID++;
}
[Browsable(false)]
[DesignerSerializationVisibility(DesignerSerializat ionVisibility.Visible)]
public int ColumnID
{
get { return m_ColumnID; }
}
}
}