How to create a property to store the index of a selected value from another property?

Question

I need help with the following problem:

I have a class with two properties.

private byte m_selectedValue;
public byte SelectedValue
{
  get { return m_selectedValue; }
  set { m_selectedValue = value; }
}

private string[] m_possibleValues;
public string[] PossibleValues
{
  get { return m_possibleValues; }
  set { m_possibleValues = value; }
}

VariableValues ​​stores a list of selectable values. SelectedValue contains the index of the actually selected value.

In this state, the property editor displays the index of the selected value. I would like to select a value using combobox in the property grid, the same style that is used with the Enum property. The combobox list will be listed in the PossibleValues ​​property.

Using this article ( http://www.codeproject.com/KB/cpp/UniversalDropdownEditor.aspx) , combobox PossibleValues. , .

( CodeProject):

public class EnumParamValuesEditor : UITypeEditor
{
    private IWindowsFormsEditorService edSvc;

    public override UITypeEditorEditStyle GetEditStyle(System.ComponentModel.ITypeDescriptorContext context)
    {
        if ((context != null) && (context.Instance != null))
            return UITypeEditorEditStyle.DropDown;
        return UITypeEditorEditStyle.None;
    }

    public override object EditValue(System.ComponentModel.ITypeDescriptorContext context, IServiceProvider provider, object value)
    {
        if ((context == null) || (provider == null) || (context.Instance == null))
            return base.EditValue(provider, value);
        edSvc = (IWindowsFormsEditorService)provider.GetService(typeof(IWindowsFormsEditorService));
        if (edSvc == null)
            return base.EditValue(provider, value);
        ListBox lst = new ListBox();
        PrepareListBox(lst, context);
        lst.SelectedIndex = (byte)value;
        edSvc.DropDownControl(lst);
        if (lst.SelectedItem == null)
            value = null;
        else
            value = (byte)lst.SelectedIndex;
        return value;
    }

    private void PrepareListBox(ListBox lst, ITypeDescriptorContext context)
    {
        lst.IntegralHeight = true;
        string[] coll = ((EnumTerminalParam)context.Instance).PossibleValues;
        if (lst.ItemHeight > 0)
        {
            if ((coll != null) && (lst.Height / lst.ItemHeight < coll.Length))
            {
                int adjHei = coll.Length * lst.ItemHeight;
                if (adjHei > 200)
                    adjHei = 200;
                lst.Height = adjHei;
            }
        }
        else
            lst.Height = 200;
        lst.Sorted = true;
        FillListBoxFromCollection(lst, coll);
        lst.SelectedIndexChanged += new EventHandler(lst_SelectedIndexChanged);
    }

    void lst_SelectedIndexChanged(object sender, EventArgs e)
    {
        if (edSvc == null)
            return;
        edSvc.CloseDropDown();
    }

    public void FillListBoxFromCollection(ListBox lb, ICollection coll)
    {
        lb.BeginUpdate();
        lb.Items.Clear();
        foreach (object item in coll)
            lb.Items.Add(item);
        lb.EndUpdate();
        lb.Invalidate();
    }

}

, (, ).

, PropertyValues ​​[SelectedValue] SelectedValue ?

Answer 1

TypeConverter SelectedValue VariableValues. TypeConverter PropertyGrid int. , , CanConvertFrom, CanConvertTo, ConvertFrom ConvertTo. , , , PossibleValues ​​ . . , - UITypeEditor.

Answer 2

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