Functionality of the selectedobject property of the propertygrid control. C#

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I'm creating a usercontrol and I want to replicate the SelectedObject property of the .NET PropertyGrid Control.  i.e.... I want the user to be able to select a control, from a list of controls which have been placed on my UserControls' Parent form. They will be selecting the control in the propertygrid inside Visual Studio.  Well, technically, they can manually assign it in code, like you can with the SelectedObject property.

What I have tried:

Update : I added a solution, down below this question, "Soluton #2

private string[] ObjectBuffer;
private string _SelectedObject = "Unknown";
[Category("Custom"), TypeConverter(typeof(SelectedObjectConverter))]
public string SelectedObject
{
    get { fillit(); return _SelectedObject; }
    set { _SelectedObject = value; }
}

private void fillit()
{
    if (this.Parent == null) return;

    List<string> listBuffer = new List<string>();

    foreach(Control c in (this.Parent as Control).Controls)
    {
        listBuffer.Add(c.Name);
    }

    ObjectBuffer = listBuffer.ToArray();

    listBuffer.Clear();
}

private class SelectedObjectConverter : StringConverter
{
    //This works ....
    //private static StandardValuesCollection SelectedObjects =
    //      new StandardValuesCollection(
    //         new string[]{"Mother", "Father", "Sister",
    //    "Brother", "Daughter", "Son",
    //    "Aunt", "Uncle", "Cousin"});

    //But, how do I access the above ObjectBuffer[]
    private static StandardValuesCollection SelectedObjects =
          new StandardValuesCollection(ObjectBuffer);

    public override bool GetStandardValuesSupported(ITypeDescriptorContext context) => true;
    public override bool GetStandardValuesExclusive(ITypeDescriptorContext context) => false;

    public override StandardValuesCollection GetStandardValues(ITypeDescriptorContext context) => SelectedObjects;
}

Posted 8-Dec-18 17:56pm

Member 13839622

Updated 11-Dec-18 5:52am

v10

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Comments

OriginalGriff 9-Dec-18 1:41am

"But, I already know how to do that."

Then what is the problem?
Where are you stuck?
What have you tried?
What help do you need?

Member 13839622 9-Dec-18 12:50pm

I updated the question and added a code sample I just tried.

Member 13839622 10-Dec-18 19:43pm

I'd updated and changed the question a million times. I've got a working version, of what I need. BUT, it only works by manually creating a string[] inside the SelectedObjectConverter class. I can't access anything outside the class. So, I can't iterate over the controls and build my real string[]. Need help figuring this out.

2 solutions

Solution 1

You can use the Controls collection, see example here: c# - Loop through all controls on a form,even those in groupboxes - Stack Overflow[^]

Posted 9-Dec-18 6:22am

RickZeeland

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Member 13839622 11-Dec-18 10:44am

That part I can do. I'm really close. I've posted my latest code snippet.

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Member 13839622 · Accepted Answer · 2018-12-11T05:39:00

Here's a non elegant solution, which probably isn't the best way to do it. If anyone can approve upon it, PLEASE LET ME KNOW:

private string _SelectedObject = "Unknown";
[Category("Custom"), TypeConverter(typeof(SelectedObjectConverter))]
public string SelectedObject
{
    get { fillit(); return _SelectedObject; }
    set { _SelectedObject = value; }
}

private void fillit()
{
    if (this.Parent == null) return;

    string[] controlStrings = new string[(this.Parent as Control).Controls.Count];

    for (int i = 0; i < (this.Parent as Control).Controls.Count; i++)
    {
        controlStrings[i] = (this.Parent as Control).Controls[i].Name;
    }

    SelectedObjectConverter.SelectedObjects = new SelectedObjectConverter.StandardValuesCollection(controlStrings);
}

private class SelectedObjectConverter : StringConverter
{
    public static StandardValuesCollection SelectedObjects = new StandardValuesCollection(new string[0]);

    public override bool GetStandardValuesSupported(ITypeDescriptorContext context) => true;
    public override bool GetStandardValuesExclusive(ITypeDescriptorContext context) => false;

    public override StandardValuesCollection GetStandardValues(ITypeDescriptorContext context) => SelectedObjects;
}