SilverlightShow: Silverlight Custom ComboBox Comments

Re: Silverlight Custom ComboBox

CongTuBot — Sun, 30 Sep 2012 12:39:05 GMT

I just wonder if it's possible to prevent dropdown when click every where on the combobox but togglebutton?

Re: Silverlight Custom ComboBox

yoosufshanij — Sat, 09 Jun 2012 11:26:24 GMT

thank u for the wonderfull control......but i found that combobox.selectedindex = -1 does not work....cud u advise me how to do that.

Re: Silverlight Custom ComboBox

EnKiu.Minh — Thu, 17 Nov 2011 11:48:29 GMT

I have an user control (like TreeView), and my purpose is adding this control as a content of Combo box, can you give me an example?

Re: Silverlight Custom ComboBox

EnKiu.Minh — Thu, 17 Nov 2011 11:46:58 GMT

I have an user control (like TreeView), and my purpose is adding this control as a content of Combo box, can you give me an example?

Re: Silverlight Custom ComboBox

Gigatron — Tue, 15 Nov 2011 15:07:56 GMT

Yes it works in 4 and 5

Re: Silverlight Custom ComboBox

durga — Tue, 15 Nov 2011 14:56:54 GMT

It is good but can we use this in silverlight 4.0

Re: Silverlight Custom ComboBox

Gigatron — Wed, 26 Oct 2011 08:06:22 GMT

this is a workaround to fix the width of the popup

 protected override Size ArrangeOverride(Size finalSize)
        {
            if (popup != null && validationElement != null)
            {
                Grid validationElementGrid = validationElement.GetVisualDescendants().OfType<Grid>().FirstOrDefault();
                double finalWidth = validationElementGrid.Width + validationElementGrid.Margin.Left + validationElementGrid.Margin.Right;
                contentBorder = popup.Child as Border;
                if (contentBorder == null)
                    return base.ArrangeOverride(finalSize);
                contentBorder.Width = finalSize.Width - finalWidth;
                            }
            return base.ArrangeOverride(finalSize);
        }

Re: Silverlight Custom ComboBox

xidius — Tue, 25 Oct 2011 18:48:14 GMT

i found behaviour error -

when i use this comboBox inside Expander- if i collapse expander when ComboBox showing Popup List, this Popup will still exist on the screen.

Re: Silverlight Custom ComboBox

Gigatron — Thu, 15 Sep 2011 16:02:54 GMT

I'm using SL5 (tried in 4 as well)

In the property of the combo box there is no DropDownWidth

whats am i doing wrong?

Full screen mode

Sergio — Thu, 05 May 2011 14:05:01 GMT

Control doesn't work correctly in full screen mode !?

Full screen mode

Sergio — Thu, 05 May 2011 14:04:03 GMT

Control doesn't work correctly in full screen mode !?

Updated but still useful

Colin P — Fri, 22 Apr 2011 15:08:31 GMT

As was said above this article is a bit outdated now, but I could still learn a lot from it. I plan on adapting this to use on my VB.NET Tutorials site. Its nice to have another developer explain things so well.

RE: Silverlight Custom ComboBox

Eric Carlson — Thu, 24 Mar 2011 17:58:35 GMT

Excellent! Thank you for posting!

RE: Silverlight Custom ComboBox

Anil Maurya — Tue, 08 Feb 2011 12:59:44 GMT

One of the best code i ever found ...keep it

Thanks for Help!!

RE: Silverlight Custom ComboBox

lnikolov — Mon, 24 Jan 2011 09:58:57 GMT

The article has been updated to the latest version of Silverlight and Visual Studio.

RE: Silverlight ComboBox

disgruntledsilverlightdev — Wed, 01 Sep 2010 13:14:34 GMT

Be warned this doesn't compile in Silverlight 4, as the Microsoft Silverlight team have actually changed the virtual method signatures of TypeConverter (plus a whole host of other compile errors).

RE: Silverlight ComboBox

Bond — Thu, 05 Aug 2010 17:38:47 GMT

When you have a List that you bind to a ComboBox by setting the ItemsSource how can you format the items?

Thanks!

Silverlight ComboBox

Vikas — Tue, 22 Jun 2010 10:09:53 GMT

how to display text in combobox in silverlight

you can display selected value of combobox into textbox in silverlight

TextBox1.Text= (cmbApplicationStatus.SelectedItem as ComboBoxItem).Content.ToString();

here, cmbApplicationStatus is Name of your combobox

thank you

RE: Silverlight ComboBox

Kamlesh — Tue, 08 Jun 2010 15:11:25 GMT

hello sir,

can u tell me how to remove a selected item from downdown list in silverlght.bcz i have one drown down box and it has 10 items so if i select 4th entry so 4th item should automatically deleted. it cant give the 4th item.

so please help me... Thanking you.

Silverlight ComboBox updated to SL3

dougblackmore — Wed, 09 Dec 2009 04:48:56 GMT

We updated the ComboBox to Silverlight 3. You can find the article, demo and code at http://www.studio6software.com/blog.

Regards,
Doug

RE: Silverlight ComboBox

silverlame — Wed, 18 Nov 2009 05:36:44 GMT

I want to have a default "ANY" value in my combo box with a value of null.

That way i know if no item has been selected when i click search or whatever.

It seems to be ridiculously weak that once i've selected an item in a combobox i can't unselect it.

RE: Silverlight ComboBox

Friso — Sun, 01 Nov 2009 13:08:34 GMT

Hi Doug, I am looking forward to the SL3 version!

For what I see now: great work!

RE: Silverlight ComboBox

dougblackmore — Tue, 27 Oct 2009 20:18:29 GMT

We're updating the ComboBox to work with SL3. I'll post here when it's ready (very shortly now).

RE: Silverlight ComboBox

ArnieB — Tue, 27 Oct 2009 19:20:57 GMT

This looks pretty good, but I have trouble getting it running in SL3. Does anyone have a demo compiled with SL3?

RE: Silverlight ComboBox

Matt — Fri, 18 Sep 2009 17:32:10 GMT

Great work. Developing a combobox can be boring but is necessary for most applications. Thank you so much for writing up this great tutorial on how to do it. Keep them coming - us developers can use all the help we can get.

Thanks, Matt (Visual Basic 6)

RE: Silverlight ComboBox

Aki — Wed, 26 Aug 2009 06:50:40 GMT

Ive added a combobox which has the years of graduation from 1999 to 2009, when the user chooses lets say 1999 from the combobox, it will automatically concatenate file name to 1999_fileName.jpg.

any idea how i can do that?

RE: Silverlight ComboBox

seb — Thu, 02 Jul 2009 12:55:20 GMT

Hi,

once you have databinded your combobox:

cboProvinces3.ItemSource=Provinces;

How can you add a row, like "Select a province" at the top ?

I've tried something like:

cboProvinces3.InsertAt(0, "[Select]");

but that gives me a System.InvalidOperationException: Operation not supported on read-only collection.

error.

Any thoughts?

thanks,

Seb

RE: Silverlight ComboBox

goldbishop — Sat, 23 May 2009 16:08:27 GMT

Need to update the source as it is currently not working for SL2....may want to take a step forward and look at porting this to SL3 since it is in beta. But overall its information on how to utilize the drop down box into SL.

RE: Silverlight with express edition

Jen — Mon, 30 Mar 2009 21:39:02 GMT

Is silverlight a freeware tools? Can I use silverlight with express edition?

RE: Silverlight ComboBox

al011757@hotmail.com — Sat, 07 Feb 2009 13:05:53 GMT

Hello when I try to use the DropDownWidth="300" property, the compiler fails, I'm using Silverlight 2, Silverlight tools 2 SP1, do you know whats is wrong here?

RE: Silverlight ComboBox

Quest4Denali — Sat, 20 Dec 2008 12:22:38 GMT

Seems like Silverlight 2.0 has caused some issues with the control. Has anyone been successful in implementing in 2.0?

RE: Silverlight ComboBox

Aref — Sun, 19 Oct 2008 21:05:19 GMT

Mr. doug I am using the combo box but one prob i am facing that after selecting item from combobox i can't change the itemsource . If I try to do that the screen becomes blank. or system crashes. No error message showing. But if i don't select any item then i can change the itemsource.

RE: Silverlight ComboBox

oneone — Tue, 07 Oct 2008 23:19:23 GMT

sorry, forgot one button

when "Save" button press, to get ComboBox's index, and TextBox's value, and that row data

RE: Silverlight ComboBox

oneone — Tue, 07 Oct 2008 22:56:48 GMT

Hi !

could you teach me how to get the row data ?

my code like this, i want when TextBox's text change, then get ComboBox's value, and that row's data

                                                                   SelectedItem="{Binding Food, Mode=TwoWay}"
                                           ItemsSource="{Binding Food, Source={StaticResource food}}" />

thanks for your help !

RE: Silverlight ComboBox

Alok Varia — Thu, 02 Oct 2008 07:48:06 GMT

Doug thanks for the prompt reply..To all the readers silverlight 2.0 beta is moved to RC and Msft have included combox box control..i havent used it but hoping i will be bug free..

Alok Varia

RE: Silverlight ComboBox

oneone — Wed, 01 Oct 2008 20:04:41 GMT

perfect !!

thanks !!

RE: Silverlight ComboBox

Doug — Wed, 01 Oct 2008 07:21:02 GMT

Sure, try the following:

Page.xaml:

    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:controls="clr-namespace:WorkSight.Controls"
    xmlns:data="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Data"
    xmlns:ComboBoxDemo="clr-namespace:ComboBoxDemo"
    Width="Auto" Height="300">














                                                                           FontFamily="Arial"
                                               FontSize="12"
                                               Width="250"
                                               Margin="2"
                                               VerticalAlignment="Center"
                                               SelectedItem="{Binding FullName, Mode=TwoWay}"
                                               ItemsSource="{Binding Provinces, Source={StaticResource provinceLookup}}"
                            />

Page.xaml.cs (use the existing Province class):

    public partial class Page
    {
        public Page()
        {
            InitializeComponent();

            IList provinces = new List();
            provinces.Add(new Province("British Columbia", "BC", new DateTime(1871, 7, 20)));
            provinces.Add(new Province("Alberta", "AB", new DateTime(1905, 9, 1)));
            provinces.Add(new Province("Saskatchewan", "SK", new DateTime(1905, 9, 1)));
            provinces.Add(new Province("Manitoba", "MB", new DateTime(1870, 7, 15)));
            provinces.Add(new Province("Ontario", "ON", new DateTime(1867, 7, 1)));
            provinces.Add(new Province("Quebec", "QC", new DateTime(1867, 7, 1)));
            provinces.Add(new Province("Newfoundland", "NL", new DateTime(1949, 3, 31)));
            provinces.Add(new Province("Prince Edward Island", "PE", new DateTime(1873, 7, 1)));
            provinces.Add(new Province("New Brunswick", "NB", new DateTime(1867, 7, 1)));
            provinces.Add(new Province("Nova Scotia", "NS", new DateTime(1867, 7, 1)));
            provinces.Add(new Province("Nunavut", "NU", new DateTime(1999, 4, 1)));
            provinces.Add(new Province("Yukon", "YT", new DateTime(1898, 6, 13)));
            provinces.Add(new Province("Northwest Territories", "NT", new DateTime(1870, 7, 15)));
            this.dataGrid.ItemsSource = provinces;
        }
    }

    public class ProvinceLookup
    {
        public IList Provinces
        {
            get
            {
                IList provinces = new[] {
                                          "British Columbia", "Alberta", "Saskatchewan", "Manitoba", "Ontario", "Quebec",
                                          "Newfoundland", "Prince Edward Island", "New Brunswick",
                                          "Nova Scotia", "Nunavut", "Yukon", "Northwest Territories"
                                      };
                return provinces;
            }
        }
    }

RE: Silverlight ComboBox

oneone — Tue, 30 Sep 2008 23:48:10 GMT

can it put into the datagrid ?

like this

RE: Silverlight ComboBox

Doug — Sat, 27 Sep 2008 08:37:01 GMT

Alok,

In the ComboBox::OnKeyDownInternal method, add the following inside the switch statement:

   case Key.Tab:
      this._applyFilter = false;
      return false;

RE: Silverlight ComboBox

Alok Varia — Fri, 26 Sep 2008 07:29:35 GMT

I just did testing on your sample code same issue l00ks like a bug....any quick fix to it??

Thanks in advance..

Alok Varia

RE: Silverlight ComboBox

Alok Varia — Fri, 26 Sep 2008 07:26:17 GMT

Hi,

First its very good control and easy to implement..i have facing one issue...when i select something and tab out using tab key it removes all the selection choice apart from what i have selected...any ideas why??

RE: Silverlight ComboBox

dougblackmore — Thu, 25 Sep 2008 09:08:22 GMT

Mark,

In generic.xaml, it's possible you may not have made the appropriate change on line 159 once you changed the namespace. The line currently reads:

You can either change the namespace, or change the line to the following:

The latest source on our website has this fix + some others:

http://worksightblog.com/?p=72

Let me know if this helps.

RE: Silverlight ComboBox

Mark Aitken — Thu, 25 Sep 2008 06:44:54 GMT

Hi,

I've added the 4 files to my own control library, changed the namespaces etc. to match in with my controls but when I add a combobox to my project I get an error message saying "Value does not fall within the expected range" Any Ideas?

RE: Silverlight ComboBox

dougblackmore — Wed, 24 Sep 2008 12:28:30 GMT

Sorry henrik, you're not giving me a lot to go on here. From what I understand, you've copied the ComboBox.cs, ComboBoxItem.cs, downarrow.png and generic.xaml to your SilverLight.Controls.dll project and kept the WorkSight.Control namespace. In VS2008, you're getting a 'missing SilverLight.Controls reference' error message?

RE: Silverlight ComboBox

henrik — Wed, 24 Sep 2008 07:59:21 GMT

The silverlight assembly I created. I called it Silverlight.Controls.dll maintaining your Namespace.

RE: Silverlight ComboBox

Doug — Sun, 21 Sep 2008 07:43:51 GMT

No, I haven't seen that one. Which assembly does it say you're missing?

RE: Silverlight ComboBox

henrik — Sun, 21 Sep 2008 04:09:21 GMT

Looks great!

I've tried to put just the combobox code files, generic.xaml and the arrow-image into a silverlight library, to reference the stuff in my silverlight project. Works during runtime, but does not work in the XAML editor in VS2008 - it tells me I'm missing an assembly reference - which i do not.

Have you experienced this one?

RE: Silverlight ComboBox

soundbox — Thu, 11 Sep 2008 22:43:48 GMT

I overwrite the Province.Equals() method and Combobox.GetComboBoxItemForObject(), now
in c#
cboProvinces3.SelectedItem=new Province("Alberta", "AB", new DateTime(1905, 9, 1));
works well, but I still do not know how to set the SelectedItem Property in xaml directlly.

RE: Silverlight ComboBox

soundbox — Thu, 11 Sep 2008 21:36:14 GMT

Thank you for your reply.
Sorry for my poor description, it is not so clear that I make you mistake...
Define cboProvinces3 as follow, I want to display "Alberta" the first time cboProvinces3 is shown.
The problem is:
"Alberta" is dynamic( eg. binding to a variable assuming its value be unique in the ItemSource )
in another word, some comboboxes having the same ItemSource as cboProvinces3 have different "Alberta" to be the "default SelectedItem"
Hope it is clear enough.

xaml

DisplayMemberPath="FullName"
SelectedItem="Alberta"
/>

IList Provinces = new List();
            Provinces.Add(new Province("British Columbia",      "BC", new DateTime(1871, 7, 20)));
            Provinces.Add(new Province("Alberta",                        "AB", new DateTime(1905, 9, 1)));
            Provinces.Add(new Province("Saskatchewan",          "SK", new DateTime(1905, 9, 1)));
            Provinces.Add(new Province("Manitoba",                    "MB", new DateTime(1870, 7, 15)));
cboProvinces3.ItemSource=Provinces;

RE: Silverlight ComboBox

dougblackmore — Thu, 11 Sep 2008 19:06:06 GMT

Eugen,

We did handle the case where focus moves to another control (in the ComboBox::LostFocus event). What is not handled is the case where a click is done on the main Silverlight surface (the 'background').

RE: Silverlight ComboBox

dougblackmore — Thu, 11 Sep 2008 18:59:14 GMT

soundbox,

To set the default selection via xaml, just set the IsSelected property on the ComboBoxItem (IsSelected="True")

RE: Silverlight ComboBox

dougblackmore — Thu, 11 Sep 2008 18:52:09 GMT

Eugen,

You're right - we did handle the 'press ESC to close' and the 'click on another combo to close and already-open-combobox' scenarios. I'll take a look.

RE: Silverlight ComboBox

soundbox — Thu, 11 Sep 2008 16:07:29 GMT

sorry, it should be "mouse-leave(to set timer on)"

RE: Silverlight ComboBox

soundbox — Thu, 11 Sep 2008 16:05:40 GMT

great job

how to set the default selecteditem using xaml?

to collapse the expanded combobox, add a timer to combobox class, let all the child control have two event-handerler, mouse-enter( to set timer off) and mouse-leave(to set timer off), then the timer will do what you wish

RE: Silverlight ComboBox

Eugen — Thu, 11 Sep 2008 12:45:10 GMT

Looks very good indeed.

However one issue you didn't solve, when combobox is expanded and you click somewhere else on the Silverlight screen it shall hide automatically.