Accessing component properties in user control

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I have written a very simple user control in C#. It looks like a ComboBox and when you click the drop down it fires up either an OpenFileDialog or FolderBrowserDialog. When the user selects a file or folder its path is shown in the text portion of my control.
The control just has a button docked to the right and a text box docked to fill the rest of the control.
It has an ImageList with several images associated with the Button. Normally when you choose an image in the IDE you get a drop down in the Properties Window and can see the images which makes it easy to choose one.
I would like that drop down available in my user control if possible. I can expose all of the properties of the Button but can't find a way to expose just the ImageIndex with the nice drop down.
Can anybody give me a steer on how to achieve this please?

What I have tried:

I have investigate using "TypeConvertor" and "Editor" in the properties but every time I think I am getting close I discover I'm not!

Posted 11-May-19 21:59pm

Jeff Gaines

Updated 12-May-19 4:20am

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[no name] 12-May-19 6:25am

Can't tell if you're trying to create an "image list", or have an "image list" but cannot figure out the "index" ... which is not part of an "image list" ... Guess it's Windows Forms and not WPF or UWP ...

2 solutions

Solution 1

Thanks Gerry. I realised as soon as I pressed the button I had missed some important information :-(
I have a base control, looks like a ComboBox and of course I can access all the properties in that. The Button it contains has an associated ImageList.
I then have a File/Folder picker derived from that base control and want to access the ImageIndex of the Button in the derived control using the same editor that Button itself uses. I have made some progress:

[DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]
		[Browsable(true), Description("The Image Index for the button"), DefaultValue(0)]
		[System.ComponentModel.TypeConverter(typeof(System.Windows.Forms.ImageIndexConverter))]		
		public int ImageIndex
		{
			get { return btnPick.ImageIndex; }
			set { btnPick.ImageIndex = value; }
		}

This does provide a drop down picker in the IDE properties window but it's empty!
I think I need an [Editor...] attribute but don't know which one is appropriate.

Posted 12-May-19 0:36am

Jeff Gaines

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phil.o 12-May-19 6:41am

Please do not bring more information to your question by providing a solution :)
You should rather click on the green "Improve question" widget which appears at the bottom of your question when you hover it.

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Jeff Gaines · Accepted Answer · 2019-05-12T04:21:00

OK, solved!
Firstly the User Control must have its own ImageList property so I added that with a 'get' accessor only. Then the property became:

C#

[DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]
[Browsable(true), Description("The Image Index for the button"), DefaultValue(0)]
[TypeConverter(typeof(ImageIndexConverter))]
[Editor("System.Windows.Forms.Design.ImageIndexEditor", typeof(UITypeEditor))]
[RelatedImageList("ImageList")]
public int ImageIndex
{
	get { return btnPick.ImageIndex; }
	set { btnPick.ImageIndex = value; }
}

QED!