CODEWITHSUNDEEP
c#.netvb.netcontextmenutoolstripdropdown
bretddog
bretddog

Reputation: 5529

How to sort items in ToolStripItemCollection?

I add strings (items) dynamically to a ToolStripItemCollection by: 

Dim onClickHandler As System.EventHandler = New System.EventHandler(AddressOf Symbol_Click)
Dim item As New ToolStripMenuItem(newSymbol, Nothing, onClickHandler)
SomeToolStripMenuItem.DropDownItems.Add(item)

So the items are not added in one go, but one-by-one based on external triggers throughout the program session. I would like to sort the drop-down-list every time I add a new item. What are my options to achieve that?

Upvotes: 7

Views: 6957

Answers (4)

Edgar5
Edgar5

Reputation: 51

Minor modification to RevitArkitek’s C# offering:

 public int Compare(object? x, object? y) {
    if ((x == null) && (y == null))
       return 0;

Note that both object X and object Y allow for nullability and the case is handled immediately when both are null. This avoids the Visual Studio nag for nullability.

Upvotes: 0

SpeziFish
SpeziFish

Reputation: 3301

Since ToolStripItemCollection has no "Sort"-Function, you have to listen on changes and write your own sort-method:

Private Sub ResortToolStripItemCollection(coll As ToolStripItemCollection)
    Dim oAList As New System.Collections.ArrayList(coll)
    oAList.Sort(new ToolStripItemComparer())
    coll.Clear()

    For Each oItem As ToolStripItem In oAList
        coll.Add(oItem)
    Next
End Sub

Private Class ToolStripItemComparer Implements System.Collections.IComparer
    Public Function Compare(x As Object, y As Object) As Integer Implements System.Collections.IComparer.Compare
        Dim oItem1 As ToolStripItem = DirectCast(x, ToolStripItem)
        Dim oItem2 As ToolStripItem = DirectCast(y, ToolStripItem)
        Return String.Compare(oItem1.Text,oItem2.Text,True)
    End Function
End Class

You have to use your own comparer (https://learn.microsoft.com/en-us/dotnet/api/system.collections.arraylist.sort)

Upvotes: 7

Sandy
Sandy

Reputation: 47

If we need to sort items in ToolStripItemCollection, we can use the following:

ItemCollection.OfType<ToolStripItem>().OrderBy(x => x.Text).ToArray();

Upvotes: 0

RevitArkitek
RevitArkitek

Reputation: 53

This post was tagged as c# so I converted it based on SpeziFish's answer. Thanks!

private void ResortToolStripItemCollection(ToolStripItemCollection coll)
    {
        System.Collections.ArrayList oAList = new System.Collections.ArrayList(coll);
        oAList.Sort(new ToolStripItemComparer());
        coll.Clear();

        foreach (ToolStripItem oItem in oAList)
        {
            coll.Add(oItem);
        }
    }

public class ToolStripItemComparer : System.Collections.IComparer
{
    public int Compare(object x, object y)
    {
        ToolStripItem oItem1 = (ToolStripItem)x;
        ToolStripItem oItem2 = (ToolStripItem)y;
        return string.Compare(oItem1.Text, oItem2.Text, true);
    }
}

Upvotes: 5

Related Questions