Adding Dynamically Control in WPF on Button click - c

I have three Text Box called TxtDocumentTitle1, TxtDocumentTitle2,TxtDocumentTitle3 lastly there is a Add More Button. Client can Click Add more Button so that it generates Text box naming TxtDocumentTitle4. If more needed he/she can Add more Text Boxes.
Sample XAML code of View
<Grid Height="450" Width="700" Background="White">
<TextBlock Height="23" HorizontalAlignment="Left" Margin="67,20,0,0" Name="textBlocKname" Text="Document Title1:" VerticalAlignment="Top" Width="110" />
<TextBlock Height="23" HorizontalAlignment="Left" Margin="67,87,0,0" Name="textBlockAddress" Text="Document Title2:" VerticalAlignment="Top" Width="110" />
<TextBlock Height="23" HorizontalAlignment="Left" Margin="67,154,0,0" Name="textBlockCompanyName" Text="Document Title3:" VerticalAlignment="Top" Width="110" />
<TextBox Height="46" Margin="67,37,87,0" Name="txtDocumentTitle1" VerticalAlignment="Top" FontSize="24" />
<TextBox Height="46" HorizontalAlignment="Left" Margin="67,106,0,0" Name="txtDocumentTitle3" VerticalAlignment="Top" Width="546" FontSize="24" />
<TextBox Height="46" HorizontalAlignment="Left" Margin="67,171,0,0" Name="txtDocumentTitle2" VerticalAlignment="Top" Width="546" FontSize="24" />
<Button Content="Add More" Height="37" HorizontalAlignment="Right" Margin="0,223,87,0" Name="btnAddmore" VerticalAlignment="Top" Width="102" />
</Grid>

You can achieve this easily via Binding. if your Window does not have a ViewModel open your window's xaml.cs and make it like this:
public Window1()
{
InitializeComponent();
DataContext = this;
}
public ObservableCollection<TextBoxVm> Items { get { return _items; } }
private ObservableCollection<TextBoxVm> _items = new ObservableCollection<TextBoxVm>();
if not, just add the two last lines to the viewModel of your window.
Now you need to define a class derived from DependencyObject and name it say TextBoxVm. create two DependencyPropertys in it (use propdp snippet) as follows:
public string Text
{
get { return (string)GetValue(TextProperty); }
set { SetValue(TextProperty, value); }
}
public static readonly DependencyProperty TextProperty =
DependencyProperty.Register("Text", typeof(string), typeof(TextBoxVm), new UIPropertyMetadata("default text",
(d,e)=>
{
var vm = (TextBoxVm)d;
var val = (string)e.NewValue;
MyDataService.FindAndUpdateItemInDatabase(vm.Id, val);//you can access database with something like this
}));
public string TitleText
{
get { return (string)GetValue(TitleTextProperty); }
set { SetValue(TitleTextProperty, value); }
}
public static readonly DependencyProperty TitleTextProperty =
DependencyProperty.Register("TitleText", typeof(string), typeof(TextBoxVm), new UIPropertyMetadata("default title"));
This would be the xaml code:
<ItemsControl ItemsSource="{Binding Items}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<WrapPanel>
<TextBlock Text="{Binding TitleText}"/>
<TextBox Text="{Binding Text}"/>
</WrapPanel>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
Now the only thing left is to write Button logic. simply add TextBoxVm to Items when Button is clicked.
Items.Add(new TextBoxVm {
TitleText = string.Format("Document Title{0}:", Items.Count+1)
});
Edit Note:
this approach is standard MVVM (expect for the button click event, which should be done using Command). So if you want to add controls in code (which is not recommended) search this :
add control to wpf grid programmatically.

*Above Answer from Bizz Gives Solution of My Question * Beside that it Rise me a Question about *DependencyObject * after Few Research i found this about Dependancy Object which may be Helpful for New comer to WPF like me :)
What is DependencyObject??
Dependency object is the base object for all WPF objects. All the UI Elements like Buttons TextBox etc and the Content Elements like Paragraph, Italic, Span etc all are derived from Dependency Object.
Dependency objects are used for WPF property system. By default, what ever the property system we have in DOT Net CLR is very basic. But Dependency properies provide lots of addtional features/services to support Data Binding.
Once you create any property as a dependency property, then automatically you get following feature implemented for you. ie. Change Notification, Validation, Call Back, Inheritance, DataBinding, Styles, Default Values etc.
If you need to implement all these features on your own for all properties where you need these feature, then it will be a big process and head ache for you. So, these all coming out of the box from Dependency Object class.
Basically dependency object class contains a dictionary. So, when ever set any value or retrieve value, then it will change the value or read from that Dictionary. So, it is nothing but a key value pair.
For Detail Info abouT DependencyObject
http://www.codeproject.com/Articles/140620/WPF-Tutorial-Dependency-Property
http://www.pinfaq.com/32/what-is-dependency-object-in-wpf-where-should-i-use-it

Related

WPF/MVVM Load same UserControl multiple times in tab control

I'm quite new to WPF/MVVM and have a lot to learn still, but I'm hitting an issue at the moment that i can't seem to find good answers for. Most probably because I'm asking the wrong questions.
What I have:
I have a main form with some buttons which load user controls. One of these user controls contains a TabControl.
This TabControl has a manually populated first Tab, which I've excluded from below snippet, but all other tabs should be populated with another user control, which will load database data depending on its viewmodel constructor.
XAML:
<TabItem Header="Two"
Name="Two"
HorizontalAlignment="Stretch"
VerticalAlignment="Stretch"
<ContentControl cal:View.Model="{Binding LoadedControl}"></ContentControl>
</TabItem>
<TabItem Header="Three"
HorizontalAlignment="Stretch"
VerticalAlignment="Stretch"
<ContentControl cal:View.Model="{Binding LoadedControl}"></ContentControl>
</TabItem>
<TabItem Header="Four"
HorizontalAlignment="Stretch"
VerticalAlignment="Stretch"
<ContentControl cal:View.Model="{Binding LoadedControl}"></ContentControl>
</TabItem>
C#
private DocumentTemplateControlViewModel _loadedControl;
public DocumentTemplateControlViewModel LoadedControl
{
get { return _loadedControl; }
set
{
if (value == _loadedControl)
return;
_loadedControl = value;
NotifyOfPropertyChange(() => LoadedControl);
}
}
public int SelectedTabIndex
{
get
{
return _selectedTabIndex;
}
set
{
Task.Run(() => LoadData());
_selectedTabIndex = value;
LoadedControl = new DocumentTemplateControlViewModel(Templates, _selectedTabIndex);
}
Now, This works as I intended it to work for Tab Two, but if I add the same line of
<ContentControl cal:View.Model="{Binding LoadedControl}">
to Tab Three,Four,etc.. (as I've done in the XAML snippet above) it will only work on the last tab that I've added the binding to, and Tab two,three will be blank.
I also tried to achieve the same thing with Caliburn Micro ActivateItem but this means i can also only declare one ActiveItem in my TabControl XAML as well.
TLDR: What is the best way to dynamically show a new user control viewmodel within a tabitem?
Thanks so much
Derive your view model from Conductor<IScreen>.Collection.OneActive and add the DocumentTemplateControlViewModel objects that you want to bind to the tabs to the Items property:
public class ShellViewModel : Conductor<IScreen>.Collection.OneActive
{
public ShellViewModel()
{
Items.Add(new DocumentTemplateControlViewModel { DisplayName = "1" });
Items.Add(new DocumentTemplateControlViewModel { DisplayName = "2" });
Items.Add(new DocumentTemplateControlViewModel { DisplayName = "3" });
}
}
DocumentTemplateControlViewModel must implement IScreen and the easiest way to do this is to derive from Screen:
public class DocumentTemplateControlViewModel : Screen
{
}
In the XAML you could then simply add a TabControl with a ContentTemplate, e.g.:
<TabControl Name="Items">
<TabControl.ContentTemplate>
<DataTemplate>
<TextBlock Text="{Binding DisplayName}" />
</DataTemplate>
</TabControl.ContentTemplate>
</TabControl>
You may replace the TextBlock with a UserControl or any other UI element.

Wpf Caliburn Micro: TextBox getter doesn't return newest value

I have a very simple sample code, a TextBox and a Button. User inputs some text in textBox and click the Button. It should show a common MessageBox which contains the text he just input in the TextBox.
Problem: the MessageBox shows blank! After some trial and error I found out the reason. I set in .xaml the Focusable of Button as false. Why? Because I want to stop the blinking effect of button after it is clicked once.
So I have an idea. I bind the Focusable to a property in ViewModel and initialized in constructor (or in private field as initial value) of ViewModel as false. Then in the Button-Click event handler before showing MessageBox I set the property to true and then after executing MessageBox set it to false again. Problem: Unfortunately, it doesn't work! It seems the Focusable can only be set once in constructor or in private field as initial value.
Does someone know how to solve this problem? I want to keep the Focusable of the Button to false (to avoid the Button blinking) and I want to get the text from TextBox by clicking the Button. Following is the sample code and feel free to modify and show me the solution. Thank you in advance.
XAML / View
<Grid Width="300" Height="300">
<StackPanel VerticalAlignment="Center">
<TextBox Width="150" Text="{Binding Path=MyText}" />
<Button x:Name="ShowText"
Width="100"
Content="Show Text"
Focusable="{Binding Path=MyFocus}" />
</StackPanel>
</Grid>
View model
public class ShellViewModel : PropertyChangedBase
{
private String _myText;
public String MyText
{
get { return _myText; }
set
{
_myText = value;
NotifyOfPropertyChange(() => MyText);
}
}
private Boolean _myFocus = false; // if it is true, the MessageBox can show MyText, otherwise MessageBox shows blank
public Boolean MyFocus
{
get { return _myFocus; }
set
{
_myFocus = value;
NotifyOfPropertyChange(() => MyFocus);
}
}
public void ShowText()
{
//MyFocus = true; // this doesn't work
MessageBox.Show(MyText);
//MyFocus = false; // this doesn't work
}
}
<Grid Width="300" Height="300">
<StackPanel VerticalAlignment="Center">
<TextBox Width="150" Text="{Binding MyText, Mode=TwoWay}" />
<Button x:Name="ShowText"
Width="100"
Content="Show Text"
Focusable="{Binding MyFocus}" />
</StackPanel>
</Grid>
or
<Grid Width="300" Height="300">
<StackPanel VerticalAlignment="Center">
<TextBox Width="150" x:Name="MyText" />
<Button x:Name="ShowText"
Width="100"
Content="Show Text"
Focusable="{Binding MyFocus}" />
</StackPanel>
</Grid>
that should work either way, the way you did the binding wouldn't ever update the underlying property since it wasn't considered bi-directional. Therefore Mode=TwoWay was necessary on the 1st version, the second version uses CM's conventions to find the the textbox and bind it to a property of the same name on the viewmodel.
not sure what blinking your referring to the default style doesn't have a blink... at least not on windows 8.1 or windows 10. The only thing focusable does in the regard of the code frag you did was prevent keyboard access..

Properties don't update front-end when written within ICommand-tied function

UPDATE 3
" I want that the text from this TextBox should be shown in another TextBox(in another view)"
The second textbox in another view is meant to show other information that is tied to the first textbox, but not the copy.
So the user control contains a text box for, say, Bus code. Once I enter bus code, tabbing out will trigger a fetch from the database for other details such as bus name, bus destination, bus model etc.
The others textbox which is in another view then displays the bus name. All following textboxes display destination and so forth. When the command is invoked, and I try to write to the property BusName, it gets assigned (and I call Notify("BusName")) but it does not show on the UI.
Hope that was more clear. Sorry for any confusion caused :).
UPDATE2 - Response to blindmeis
Thanks for your reply though this not appear to be what I was looking for. The tab out is essential because that is how management wants their pages to be populated i.e. when you tab out of a 'code' textbox after entering the code, it will use the code to fetch data from the db to populate the rest of the controls. This does not appear to have the tab-out behavior in it. As for the 3rd dependency property, it is in my original code, I simply did not include it here because the value in the first textbox (user control tabout textbox) is not relevant to the problem. Simply, what I am trying to accomplish is that the second textbox must populate when you tab-out of the first textbox.
I could do this with an eventhandler, but wanted to use commands. I am thinking now perhaps commands are not the way to go here and I should switch to using an event handler.
Please advise if you still have any ideas on how to get the second textbox to populate when you tab out of the first (by putting a breakpoint in populate, you will see that the property gets assigned. ). If I have not understood correctly or missed something here, please let me know. Thanks!
UPDATE!
I have created a VS2013 solution mimicking my code, which reproduces the problem. It is at this public google drive link as a zip file (takes a few seconds for the download icon to appear):
https://drive.google.com/file/d/0B89vOvsI7Ubdbk85SVlvT3U2dVU/view?usp=sharing
You will see that the 2nd text box does not update despite the bound property storing the new value.
Greatly appreciate any help. Thanks in advance.
Original post:
I have a textbox control to which I have tied a key binding based command to go process some actions (in a method that the command has been tied to) when the user hits tab while in the textbox (tabs out).
I have other controls in that page that are boiund to properties in the viewmodel that I write to in that tab-out connected function. When I write my properties in the constructor or somewhere 'outside' that command invokation they seem to work fine and the values show on the page, but when I write them within that command invocation, the properties in the vm contain the values but don't show up on the UI
Any ideas why and how to fix?
Thanks much in advance
From XAML:
<TextBox Name="txtCode" Text="{Binding Path=CodeValue, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}">
<TextBox.InputBindings>
<KeyBinding Key="Tab" Command="{Binding RetrieveRecordCmd}" > </KeyBinding>
</TextBox.InputBindings>
</TextBox>
From VM:
RetrieveRecordCmd = new GSSCommand(RetrieveRecord, param => this.CanExecuteRetrieveRecordCmd);
Command tied function:
public void RetrieveRecord(object obj)
{
objPie = null;
//Check if a record exists for that code
gssSvcMethodStatusBase = gssSvcClientBase.ReadPies(ref gssSvcGlobalVarsBase, out objPie, out grfaBase, CodeValue);
if ((objPie != null)) // && (objPie.DateCreated > DateTime.MinValue))
PopulatePage(objPie);
else if (objPie == null)
InitiateCreateNew();
else
return;
}
It looks like you have implemented the INotifyPropertyChanged interface in the strict sense, but are missing the actual functionality. The interface itself doesn't automatically give you change notifications. You also need to fire the PropertyChanged event when each property changes. The standard pattern looks like:
private string _name;
public string Name
{
get { return _name; }
set
{
if (_name == value)
return;
_name = value;
NotifyPropertyChanged("Name");
}
}
You should make a habit of writing all mutable properties which you intend to bind to the UI in this format. Snippets can make this easier to do consistently.
this works, but i dont know if this is the behavior you want.
<UserControl x:Class="ProblemDemoWPF.TextBoxTabOutUserControl"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
mc:Ignorable="d"
Name="TabOutTextUserControl"
>
<StackPanel Margin="0,0,0,0" Orientation="Horizontal">
<Label Content="UserControl (ucTextBox)->"></Label>
<TextBox Width="80" Height="30" BorderBrush="Black"
BorderThickness="2"
HorizontalAlignment="Center"
VerticalAlignment="Center"
Text="{Binding ElementName=TabOutTextUserControl, Path=CodeValue}">
</TextBox>
</StackPanel>
</UserControl>
new Dependency Propertie with right binding without DataContext
public partial class TextBoxTabOutUserControl : UserControl
{
public static readonly DependencyProperty CodeValueProperty =
DependencyProperty.Register("CodeValue", typeof(string), typeof(TextBoxTabOutUserControl));
public string CodeValue
{
get { return (string)GetValue(CodeValueProperty); }
set { SetValue(CodeValueProperty, value); }
}
public TextBoxTabOutUserControl()
{
InitializeComponent();
}
}
Just bind both to LocTextBoxText
<Window x:Class="ProblemDemoWPF.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:loc="clr-namespace:ProblemDemoWPF"
Height="350" Width="525">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="auto"></RowDefinition>
<RowDefinition Height="auto"></RowDefinition>
<RowDefinition Height="auto"></RowDefinition>
<RowDefinition Height="auto"></RowDefinition>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="Auto"/>
</Grid.ColumnDefinitions>
<loc:TextBoxTabOutUserControl Grid.Row="0" Grid.Column="0" Grid.ColumnSpan="2" HorizontalAlignment="left"
CodeValue="{Binding Buscode, Mode=OneWayToSource}"/>
<Label Content="Busname" Grid.Row="1" Grid.Column="0" HorizontalAlignment="Left"></Label>
<TextBox Width="100" Grid.Row="1" Grid.Column="1" Text="{Binding Path=Busname, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"></TextBox>
<Label Content="Busdestination" Grid.Row="2" Grid.Column="0" HorizontalAlignment="Left"></Label>
<TextBox Width="100" Grid.Row="2" Grid.Column="1" Text="{Binding Path=Busdestination, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"></TextBox>
<Label Content="Busmodel" Grid.Row="3" Grid.Column="0" HorizontalAlignment="Left"></Label>
<TextBox Width="100" Grid.Row="3" Grid.Column="1" Text="{Binding Path=Busmodel, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"></TextBox>
</Grid>
</Window>
add Notify to property setter
class MainWindowViewModel : INotifyPropertyChanged
{
private String _buscode;
private string _busname;
private string _busdestination;
private string _busmodel;
public String Buscode
{
get
{
return _buscode;
}
set
{
if (_buscode != value)
{
_buscode = value;
Notify("Buscode");
FetchData(_buscode);
}
}
}
private void FetchData(string buscode)
{
//DB stuff
this.Busname = "Name 1234";
this.Busmodel = "Model 1234";
this.Busdestination = "Destination 1234";
}
public string Busname
{
get { return _busname; }
set { _busname = value; Notify("Busname"); }
}
public string Busdestination
{
get { return _busdestination; }
set { _busdestination = value; Notify("Busdestination"); }
}
public string Busmodel
{
get { return _busmodel; }
set { _busmodel = value; Notify("Busmodel"); }
}
public event PropertyChangedEventHandler PropertyChanged;
protected void Notify(string propertyName)
{
if (this.PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
}

Not getting updates as per Selected date in view contains Datagrid binded with Generic List?

I have used tab control for view my usercontrols..
in 1st usercontrol
I have used datagrid to diplay Record and for Binding I have used generic List.
When want to change this List as per selected date then that collection is changed in database and in viewmodel also as List's set propery get executes but in view when i selected new tab and then go back to prevois tab at that time List's get property executes & then i am able get view as per selected date.
My main view and which contain 1st usercontrol as 1st tab item is given below:
Xaml code for above view is given below:
<DataGrid
Background="Transparent"
CanUserAddRows="True"
CanUserReorderColumns="False"
ItemsSource="{Binding Model_Transactions_TransactionsDetails_Jama,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}"
HeadersVisibility="Column">
</DataGrid>
<Grid DockPanel.Dock="Bottom" VerticalAlignment="Bottom" >
<Border BorderBrush="Black" BorderThickness="1" >
<Label HorizontalAlignment="Left" HorizontalContentAlignment="Right" Width="75" Content="{Binding SumOfWeightJama,UpdateSourceTrigger=PropertyChanged}" FontFamily="Segoe UI" FontWeight="Bold" FontSize="16" />
</Border>
</Grid>
<DataGrid
Background="Transparent"
CanUserAddRows="True"
CanUserReorderColumns="False"
ItemsSource="{Binding Model_Transactions_TransactionsDetails_Udhar,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}"
HeadersVisibility="Column">
</DataGrid>
<Grid DockPanel.Dock="Bottom" VerticalAlignment="Bottom">
<Border BorderBrush="Black" BorderThickness="1">
<Label Width="75" HorizontalAlignment="Left" HorizontalContentAlignment="Right" Content="{Binding SumOfWeightUdhar,UpdateSourceTrigger=PropertyChanged}" FontFamily="Segoe UI" FontWeight="Bold" FontSize="16"/>
</Border>
</Grid>
And View Model for above View is given below:
private DateTime _FilterDate ;
public DateTime FilterDate
{
get
{
return _FilterDate;
}
set
{
_FilterDate = value;
OnPropertyChanged("FilterDate");
Model_Transactions_TransactionsDetails_Jama = (ViewModel.AllDataCollactions.AllTransactionsDetails.Where(s => s.TransactionDate.Equals(FilterDate) && s.IsJama).OrderBy(s => s.TransactionsID)).ToList();
Model_Transactions_TransactionsDetails_Udhar = (ViewModel.AllDataCollactions.AllTransactionsDetails.Where(s => s.TransactionDate.Equals(FilterDate) && !s.IsJama).OrderBy(s => s.TransactionsID)).ToList();
}
}
public List<Model_TransactionsDetails> Model_Transactions_TransactionsDetails_Jama
{
get
{
return model_Transactions_TransactionsDetails_Jama;
}
set
{
model_Transactions_TransactionsDetails_Jama = value;
OnPropertyChanged("Model_Transactions_TransactionsDetails_Jama");
}
}
public List<Model_TransactionsDetails> Model_Transactions_TransactionsDetails_Udhar
{
get
{
return model_Transactions_TransactionsDetails_Udhar;
}
set
{
model_Transactions_TransactionsDetails_Udhar = value;
OnPropertyChanged("Model_Transactions_TransactionsDetails_Udhar");
}
}
public ViewModel_MasterBook()
{
FilterDate = DateTime.Now.AddDays(-1).Date;
InsertCommand = new RelayCommand(AddExecute, CanAdd);
}
Can any one help me How can i get view as per selected date immediately..
actually it should work i cant see an error. but when i use some kind of Lists in my WPF projects i use observablecollection with clear, add, delete.
but first i would change the binding
ItemsSource="{Binding Model_Transactions_TransactionsDetails_Jama,Mode=OneWay}"
because Mode=TwoWay makes no sense, you never set the itemssource from your datagrid to the viewmodel.
second i would change to ObservableCollection
public ObservableCollection<Model_TransactionsDetails> Model_Transactions_TransactionsDetails_Jama
{
get; private set;
}
with private setter because just initialize once.
//ctor
this.Model_Transactions_TransactionsDetails_Jama = new ObservableCollection<Model_TransactionsDetails>();
and then in your FilterDate setter fill the collection
this.Model_Transactions_TransactionsDetails_Jama.Clear();
var newdata = (ViewModel.AllDataCollactions.AllTransactionsDetails.Where(s => s.TransactionDate.Equals(FilterDate) && s.IsJama).OrderBy(s => s.TransactionsID)).ToList();
this.Model_Transactions_TransactionsDetails_Jama.AddRange(newdata);//AddRange is simply an extension method i wrote, you can simply use foreach and .Add()

How to select all checkbox inside telerik combox on checbox Checked event?

I have on checkbox inside telerik combo control. If User click on "All" option from checkbox list then I want select all checkboxs.
checkbox values.
My Sample code is below.
<telerik:RadComboBox Name="rcbDays" Grid.Row="1" Grid.Column="1" Width="200" HorizontalAlignment="Left" ItemsSource="{Binding MonthDaysList}" VerticalAlignment="Center" >
<telerik:RadComboBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<CheckBox Name="chkDays" Content="{Binding DaysText}"
Tag="{Binding DaysValue}" Checked="chkDays_Checked" />
</StackPanel>
</DataTemplate>
</telerik:RadComboBox.ItemTemplate>
</telerik:RadComboBox>
private void chkWeeks_Checked(object sender, RoutedEventArgs e)
{
//Here I want code for selecting all checkboxes.
}
The items that you bound the ComboBox to should have a property like IsSelected, then you should bind IsChecked of the data-template CheckBox to that. Then you just need to iterate over the source collection and set IsSelected=true on all items.
e.g.
public class MyClass : MyBaseClass // Whatever you may have called it,
{
public bool IsSelected { ... }
public string DaysText { ... }
//...
}
<DataTemplate>
<StackPanel Orientation="Horizontal">
<CheckBox IsChecked="{Binding IsSelected}" Content="{Binding DaysText}" Tag="{Binding DaysValue}" />
</StackPanel>
</DataTemplate>
//In the handler that is supposed to select all
foreach (var item in MonthDaysList) item.IsSelected = true;
Of course the property needs to have change notifications.
(Also a note on usability: I do not thing that ComboBoxes should contain CheckBoxes, if you need multiple item selection use a ListBox)
You need to take one more property isSelected as said by H.B.
add IsChecked="{Binding IsSelected}" to CheckBox tag in xaml file. Create one property in the appropriate class i.e. public bool isSeleted.......
When you get in to event chkWeeks_Checked() in this function get reference of the ComboBox item source like objList = (TypeCastYourClassType)YourComboBox.ItemSource;... Now the objList contains all checkbox items. Iterate through objList collection and get isSeleted property for each and every single item and that's done....
In your case
MonthDayList = (TypeCastYourClassType)rcbDays.ItemSource;
for(int i=0;i<MonthDayList.Count;i++)
{
MonthDayList[i].isSelected = true;
}
Here is some good discussion for allowing multiple values to be selected in the telerik combobox.
It uses checkbox within combobox
http://codedotnets.blogspot.in/2012/02/checkboxes-in-comboxes-to-allow.html
Thanks :)

Resources