当另一个下拉列表中的选定项目更改时，需要更改下拉列表中的选定项目

Question

I have a windows form application with two Combo boxes (Dropdownlist style). The first combo box gets the data from a List of AppTable object, like so:

foreach (AppTable table in appTableList)
            cbxSelectName.Items.Add(table.App);

I have set up a trigger for when the selected item in this dropdown is changed:

this.cbxSelectName.SelectedIndexChanged +=new EventHandler(cbxSelectName_SelectedIndexChanged);

And finally, here is the definition of the method the trigger calls. Please note, the value in tbxNewWikiWord textbox changes as the selected item is changed. However, the same does not happen in the second dropdown list ( cbxUpdateAppType):

private void cbxSelectName_SelectedIndexChanged(object sender, EventArgs e)
    {
        foreach (AppTable table in appTableList)
        {
            if (table.App == cbxSelectName.SelectedItem.ToString())
            {
                this.tbxNewWikiWord.Text = table.WikiWord;
                this.cbxUpdateAppType.SelectedItem = table.Type;
                break;
            }
        }

    }

This is how AppTable looks:

class AppTable
{
    public string App { get; set; }
    public string Type { get; set; }
    public string WikiWord { get; set; }

}

Am I missing something?

Answer 1

Adding values to cbxUpdateAppType from the AppTable object fixed it. I'm not sure why since in either case, I was adding Strings.

I just needed to check for duplicates so I don't end up with multiple instances of the same value in my dropdown box.

foreach (AppTable table in appTableList)
        {
            if (!cbxUpdateAppType.Items.Contains(table.Type))
                cbxUpdateAppType.Items.Add(table.Type);
        }