Develop Reference

WPF Clear combobox text value when checkbox is unchecked

I want to clear the combobox text value or set it to another string whenever the checkbox is uncheck. Is there any good way to bind them together in xaml ?
Thanks.

Maybe this helps. It is solved with bindings:
<Grid>
<ComboBox IsEditable="{Binding ElementName=Box, Path=IsChecked}" HorizontalAlignment="Left" Margin="211,167,0,0" VerticalAlignment="Top" Width="120">
<ComboBoxItem>Test</ComboBoxItem>
<ComboBoxItem>Test2</ComboBoxItem>
</ComboBox>
<CheckBox x:Name="Box" Content="Clear" HorizontalAlignment="Left" Margin="131,171,0,0" VerticalAlignment="Top"/>
</Grid>
If you want to change the text, it may be necessary to write a converter:
Text="{Binding ElementName=Box, Path=IsChecked, Mode=OneWay, Converter={StaticResource TextConverter}}"
Take a look at Microsoft Documentation about how to write a value converter.

Why is my Visibility binding not working?

I have a problem with one of my Visibility Bindings.
In my application I have a Textbox and a combobox at nearly the same place.
They are overlapping so I have two Variables in the background for their Visibility. They are in a Datagrid, so the Visibility Source will be provided from the list.
The Binding of my Combobox works absolutely fine, but the one of my Textbox doesn't
Here is my Code:
<TextBox x:Name="Textvalue"
HorizontalAlignment="Left"
VerticalAlignment="Center"
Width="150"
BorderBrush="#FF383F55"
BorderThickness="0"
Foreground="White"
Background="#FF232734"
Text="{Binding Path=Value, UpdateSourceTrigger=PropertyChanged}"
Visibility="{Binding Path=IsPath}"/>
<ComboBox x:Name="Combobox"
VerticalAlignment="Center"
Foreground="White"
Margin="3,3,3,3"
Height="23"
ItemsSource="{Binding Path=ValueArray}"
SelectedValue="{Binding Path=Value, UpdateSourceTrigger=PropertyChanged}"
Style="{DynamicResource ComboBoxStyle1}"
Visibility="{Binding Path=IsCombobox}"/>
These are my Get Property for both (Both only have the Get Proberty):
public System.Windows.Visibility isPath
{
get
{
return _IsPath;
}
}
public System.Windows.Visibility IsCombobox
{
get
{
return _IsCombobox;
}
}
I hope you can help me because I don't know what's wrong here :/
Thanks in advance
What I have tried:
Tried to change the binding to a different Variable.

The property name in your code has a lower case 'i' public System.Windows.Visibility isPath and the XAML has an upper case I in binding IsPath. Change this and it should be working!
{Credit C S, I'd already started writing this}

How to retrieve the text entered in texbox inside datagrid

I have a textbox inside a datagrid in a cellediting template. I want to bind the text
entered in the textbox to textblock each cell. I tried this code but it will not worked.
Here is my xaml:
<DataTemplate>
<StackPanel Orientation="Horizontal">
<!--<ComboBox x:Name="monday" Width="50" IsSynchronizedWithCurrentItem="true" Loaded="monday_Loaded" SelectionChanged="monday_SelectionChanged"></ComboBox>-->
<ComboBox x:Name="monday" Width="30" ItemsSource="{Binding Path=Subjects}" DataContext="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=UserControl}}" SelectedItem="{Binding SelectedCollectionItem,Mode=TwoWay}" Loaded="monday_Loaded" SelectionChanged="monday_SelectionChanged"></ComboBox>
<ComboBox x:Name="staff" Width="30" ItemsSource="{Binding Path=mondstaff}" DataContext="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=UserControl}}" SelectedItem="{Binding SelectedCollectionItem1,Mode=TwoWay}" Loaded="staff_Loaded" SelectionChanged="staff_SelectionChanged"></ComboBox>
<TextBox x:Name="monothers" Visibility="Hidden" Text="{Binding Path=Subjects}" DataContext="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=UserControl}}" SelectedText ="{Binding SelectedCollectionItem2,Mode=TwoWay}" Width="30" TextChanged="monothers_TextChanged"></TextBox>
<!--<ComboBox x:Name="staff" Width="50" Loaded="staff_Loaded"></ComboBox>-->
</StackPanel>
</DataTemplate>
Here is my code:
public string SelectedCollectionItem
{
get { return _SelectedCollectionItem; }
set
{
_SelectedCollectionItem = value;
RaiseProperty2("SelectedCollectionItem2");
}
}
If anyone knows how to do it, kindly help me.

I think you missed this code in your code-behind
public void monothers_TextChanged(object sender, TextChangedEventArgs e)
{
var binding = ((TextBox)sender).).GetBindingExpression(TextBox.TextProperty);
binding.UpdateSource();
}
More details
see this discussion
How to hookup TextBox's TextChanged event and Command in order to use MVVM pattern in Silverlight
and also you need to refer this blog
Make a Silverlight TextBox update its binding on every character with a Behavior

Binding data in C# and XAML?

I'm trying to use binding with C# and a XAML SemanticZoom control in my Metro app, but honestly I'm at a loss as to how to do it. Here's the XAML code I've gotten so far by piecing together from questions, articles, etc:
<SemanticZoom x:Name="boardZoom" Height="626" Margin="10,132,10,0" VerticalAlignment="Top">
<SemanticZoom.ZoomedInView>
<GridView IsSwipeEnabled="True" x:Name="ItemsGridView">
<GridView.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal" Margin="10,10,0,0"
HorizontalAlignment="Left" Background="White">
<TextBlock Text="{Binding Title}" TextWrapping="Wrap" Width="200" Height="300"
FontFamily="Global User Interface" FontSize="40" Foreground="Black"
VerticalAlignment="Center" HorizontalAlignment="Left"/>
<Image Source="{Binding Image}" Height="60" Width="60"
VerticalAlignment="Center" Margin="0,0,10,0" Visibility="{Binding isImage}" />
<TextBlock Text="{Binding Category}" TextWrapping="Wrap" Width="200"
FontFamily="Global User Interface" Foreground="Black"
VerticalAlignment="Center" HorizontalAlignment="Left"/>
</StackPanel>
</DataTemplate>
</GridView.ItemTemplate>
</GridView>
</SemanticZoom.ZoomedInView>
<!--Didn't include SemanticZoom.ZoomedOutView since I'm still trying to get the ZoomedIn one working first-->
</SemanticZoom>
And my C# code:
List<PinStore.pin> pins = PinStore.CopyFromStream(response.GetResponseStream()); //returns a list of PinStore.pin objects, which have name, type, Image, isImage, and Category objects
System.Collections.ObjectModel.ObservableCollection<SemanticZoomed.zoomedIn> toSource = new System.Collections.ObjectModel.ObservableCollection<SemanticZoomed.zoomedIn>(); //should I be using ObservableCollection or something like List<> here?
foreach (PinStore.pin pin in pins)
{
SemanticZoomed.ZoomedIn toAdd = new SemanticZoomed.ZoomedIn(); //class with Title, Image, isImage, and Category objects
if (pin.type == "text")
{
toAdd.Title = pin.name;
toAdd.Image = null;
toAdd.isImage = Visibility.Collapsed;
toAdd.Category = pin.category;
}
toSource.Add(toAdd);
}
ItemsGridView.DataContext = toSource;
I've not had much experience in XAML/C#, and zero experience with binding. I'm not getting any errors, but I've noticed that if I replace ItemsGridView.DataContext = toSource; with ItemsGridView.ItemsSource = toSource; a blank stackpanel shows up in the GridView, and I can't seem to find a way to fill that with the Title and Category values I specify. Thanks!

Well you should first consider creating a ResourceDictionary so you can save your item style. Then you can set the ItemStyle to the Resource Dictionary.
But regardless you need to do: ItemsGridView.ItemsSource = toSource; If you do not choose to Bind the toSource in the GridView xaml.
Also make sure the SemanticZoomed.zoomedIn object implements the INotifyPropertyChanged interface, And calls the event properly. And make sure the Title, Image, Category, etc are public properties that call the event when edited. and Also you need make sure pin.Text is an actual value. {Making sure}.
If you want to learn more about data binding check out how they do it in C# & XAML with Windows 8 {Should be the same thing}:
http://msdn.microsoft.com/en-us/library/windows/apps/xaml/hh464965.aspx

ListBox ItemsSource Binding doesn't work

I'm developing a Windows Phome application. I have the following ListBox on a page:
<ListBox Margin="10,10,8,8" x:Name="WallList">
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<StackPanel />
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
<ListBox.ItemTemplate>
<DataTemplate>
<Grid x:Name="ListBoxItemLayout" Background="Transparent" Margin="10">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="0.33*"/>
<ColumnDefinition Width="0.77*"/>
</Grid.ColumnDefinitions>
<Image HorizontalAlignment="Left" Margin="0" Source="{Binding ImagePath}" Height="200"/>
<StackPanel Margin="5,0,0,0" Grid.Column="1">
<TextBlock x:Name="Name" TextWrapping="Wrap" Text="{Binding Name}" Style="{StaticResource PhoneTextTitle2Style}"/>
<TextBlock x:Name="Comment" Margin="0,5,0,0" TextWrapping="Wrap" Text="{Binding Comment}" Style="{StaticResource PhoneTextNormalStyle}" Height="130"/>
<TextBlock x:Name="When" TextWrapping="Wrap" Text="{Binding When}" Style="{StaticResource PhoneTextTitle3Style}" VerticalAlignment="Bottom"/>
</StackPanel>
</Grid>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
I'm using this to fill the ListBox on Loaded event:
this.WallList.ItemsSource = StartingWall.GetWallPosts();
And now I want to add more items programmatically when the user write down some text on a TextBox and click on a button. I want to place this text on Comment field.
I'm gooing to fill the rest fields with default data.
My question is:
How can I add more items to WallList ListBox?
Someone has suggested to do the following:
public ObservableCollection<WallPostEntry> MyWallPosts {get;set;}
// Initialize MyWallPosts to whatever
MyWallPosts.Add(new WallPostEntry("new entry"));
<ListBox Margin="10,10,8,8" x:Name="WallList" ItemsSource="{Binding MyWallPosts}">
But Binding ListBox ItemsSource doesn't work for me. I'm initializing MyWallPosts on constructor, just before InitializeComponent();, like this:
public Wall()
{
MyWallPosts = StartingWall.GetWallPosts();
InitializeComponent();
}
Any advice?
Thanks.

I see a couple wierd things:
first, you're using the itemssource binding in one place, but explicitly setting it in another? setting something in code will override/undo any bindings, so that could cause a problem (but it looks like you're setting it to the same thing so that shouldn't make a difference, but i'd remove the this.WallList.ItemsSource = StartingWall.GetWallPosts(); call entirely, and leave the ItemsSource="{Binding MyWallPosts}" in the xaml. the point of using bindings is to get rid of this kind of code)
second, you're setting mywallposts and using a binding, but not setting the datacontext on your object itself? simplest in your example would be to just add one line to your constructor:
public Wall()
{
DataContext = this;
MyWallPosts = StartingWall.GetWallPosts();
InitializeComponent();
}
My next suggestion would be to simplify until it works. leave the listbox but comment out all of the item/data templating to make sure that you don't have a bug in your template

Could he just add
a DataContext property to this:
<ListBox Margin="10,10,8,8" x:Name="WallList" ItemsSource="{Binding MyWallPosts}">
so:
<ListBox Margin="10,10,8,8" x:Name="WallList" ItemsSource="{Binding MyWallPosts}" DataContext="{Binding MyWallPosts}">
Would there be any way of setting the dataContext declarativelly?
tks,
Oscar