How to remve toolstripdropdownbutton.dropdwonitems dynamically?

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VS2015

Hi,
I have a small project having toolstripmenuitem. I wish to remove toolstripmenuitem during the form_pageLoad()...Is it possible?

My Codes

C#

<pre>for each(ToolStripMenuItem dropDownItem in reportstoolStripDropDownButton.DropDownItems) {
if (dropDownItem.Name == MyTable.Rows[M1]["report_menu_name"].ToString()) {
   //MessageBox.Show(dropDownItem.Name);
   reportstoolStripDropDownButton.DropDownItems.Remove(dropDownItem);
}
}

Error Messages:

Invalid OperationException was unhandled - Collection was modified : Enumeration Operation may not execute

Thanks for the helps

What I have tried:

Tried to remove toolstripmenuitem programmatically

Posted 17-Sep-19 9:32am

Paramu1973

Updated 17-Sep-19 23:49pm

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2 solutions

Solution 2

A different approach: I have deliberately used multiple checks for valid names; in production code, I'd use try/catch.

private void RemoveDDownMenuItem(MenuStrip mnuStrip, string menuItemName, string ddownMenuItemName)
{
    if (! mnuStrip.Items.ContainsKey(menuItemName))
    {
        // throw error ?
        return;
    }

    ToolStripItem menu = mnuStrip.Items[menuItemName];

    if(! (menu is ToolStripMenuItem))
    {
        // throw error ?
        return;
    }

    ToolStripMenuItem tsmenu = (ToolStripMenuItem) menu;

    if (! tsmenu.HasDropDown)
    {
        // throw error ?
        return;
    }

    if (! tsmenu.DropDownItems.ContainsKey(ddownMenuItemName))
    {
        // throw error ?
        return;
    }
    
    tsmenu.DropDownItems.Remove(tsmenu.DropDownItems[ddownMenuItemName]);
}

Posted 17-Sep-19 23:50pm

BillWoodruff

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This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Richard Deeming · Accepted Answer · 2019-09-17T09:41:00

You'll need to remove the item from outside of the foreach loop. For example:

C#

string nameToFind = MyTable.Rows[M1]["report_menu_name"].ToString();
List<ToolStripMenuItem> itemsToRemove = new List<ToolStripMenuItem>();

foreach (ToolStripMenuItem dropDownItem in reportstoolStripDropDownButton.DropDownItems)
{
    if (dropDownItem.Name == nameToFind)
    {
        itemsToRemove.Add(dropDownItem);
    }
}

foreach (ToolStripMenuItem dropDownItem in itemsToRemove)
{
    reportstoolStripDropDownButton.DropDownItems.Remove(dropDownItem);
}

How to remve toolstripdropdownbutton.dropdwonitems dynamically?

2 solutions

Solution 1

Solution 2

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How to remve toolstripdropdownbutton.dropdwonitems dynamically?

2 solutions

Solution 1

Solution 2

Add your solution here

Preview 0

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