Add checked = true via programming

Question

I have been adding items to tool strip by programming but the issue is that I need to add checked property to it. Do not know how to do so. Here is the code:

toolStripMenuItemAudioSampleRate.DropDownItems.Add("8 kHz", null, new EventHandler(mnuAudioSamplingRate_Click));
toolStripMenuItemAudioSampleRate.Checked = (samplingRate == 8000);//Checks if the there is no vid device

Now I know that it will work wrong because I have added checked property to toolStripMenuItemAudioSampleRate not the 8 kHz. I am trying to add this property to the dynamically added items.

Thanks in advance.

Answer 1

To make this code fancier, I suggest removing new EventHandler, which is always redundant, and using object initializer:

toolStripMenuItemAudioSampleRate.DropDownItems.Add (
    new ToolStripMenuItem ("8 kHz", null, mnuAudioSamplingRate_Click) {
        Checked = (samplingRate == 8000)
    });

Answer 2

You can create an Decorator(GOF Design Pattern) http://www.exciton.cs.rice.edu/JavaResources/DesignPatterns/book/hires/pat4dfso.htm

Answer 3

Instead of using the Add(String, Image, EventHandler) helper method to create the drop down item, make your own ToolStripMenuItem, set it to checked, and then add it to the list.

ToolStripMenuItem item = new ToolStripMenuItem("8 kHz", null, new EventHandler(mnuAudioSamplingRate_Click));
item.Checked = (samplingRate == 8000);
toolStripMenuItemAudioSampleRate.DropDownItems.Add(item);

Answer 4

toolStripMenuItemAudioSampleRate.DropDownItems["8 kHz"].Checked = (samplingRate == 8000)

That might do what you want. It might be a good idea to hold on to these dynamically added items in an array somewhere, so that you don't have to use this ugly syntax.