Basically what I need to know is how to send the source of an HierarchicalDataTemplate into a binding, this is what I have:
<HierarchicalDataTemplate DataType="{x:Type myModel:Person}">
<StackPanel Orientation="Horizontal">
<Image Source="Images\User.gif" />
<TextBlock Margin="5,0,0,0" Text="{Binding Name}" />
</StackPanel>
<HierarchicalDataTemplate.ItemsSource>
<MultiBinding Converter="{StaticResource PersonConverter}">
<Binding Path="Name" />
<!-- Here I need something like Binding Path="Self" so I can send the source of the binding (the "Person" object) -->
</MultiBinding>
</HierarchicalDataTemplate.ItemsSource>
</HierarchicalDataTemplate>
So my source is an object of type myModel:Person, I want to be able to send the object itself in the MultiBinding so the PersonConverter can use it.
Thanks for any help.
Wow, I did a crazy wild guess and it worked =S lol, here's the solution
<MultiBinding Converter="{StaticResource PersonConverter}">
<Binding Path="Name" />
<Binding Path="." /> <!-- this sends the source of the binding -->
</MultiBinding>
Thanks!
Related
I have a ComboBox which should display different values based on a condition.
If the SelectedValue's properties Name or Email is not null and is not empty I want to display those.
If above is not true I want to fallback and display the SelectedValue's Username, this is never null or empty.
This is what I have so far.
<ctrls:RadComboBoxExtended Grid.Row="0" Grid.Column="1" ItemsSource="{Binding CurrentValue.LIST_OF_USERS}" SelectedValue="{Binding CurrentValue.User}" focus:FocusExtension.IsFocused="{Binding Focuspoint}">
<ctrls:RadComboBoxExtended.ItemTemplate>
<DataTemplate>
<TextBlock>
<TextBlock.Visibility>
<MultiBinding Converter="{StaticResource MultiNullOrEmptyStrToVisibility}" ConverterParameter="1">
<Binding Path="Name"/>
<Binding Path="Email"/>
</MultiBinding>
</TextBlock.Visibility>
<Run Text="{Binding Name}"/>
<Run Text="("/><Run Text="{Binding Email}"/><Run Text=")"/>
</TextBlock>
</DataTemplate>
</ctrls:RadComboBoxExtended.ItemTemplate>
</ctrls:RadComboBoxExtended>
Above XAML displays all users which have a Name and Email correctly.
How would I go about displaying the "else branch" for this? As of now the users which do not meet the condition of my converter is blank in the ComboBox. How can I display those?
Simplest way is to surround TextBlock with StackPanel or Grid and put also another TextBlock there, setting ConverterParameter="10" and handling it so, that only one of TextBlocks will be visible.
Another possibility is to use ItemTemplateSelector to define which DataTemplate should be used if RadComboBoxExtended has such a property.
<ctrls:RadComboBoxExtended Grid.Row="0" Grid.Column="1" ItemsSource="{Binding CurrentValue.LIST_OF_USERS}" SelectedValue="{Binding CurrentValue.User}" focus:FocusExtension.IsFocused="{Binding Focuspoint}">
<ctrls:RadComboBoxExtended.ItemTemplate>
<DataTemplate>
<StackPanel>
<TextBlock>
<TextBlock.Visibility>
<MultiBinding Converter="{StaticResource MultiNullOrEmptyStrToVisibility}" ConverterParameter="1">
<Binding Path="Name"/>
<Binding Path="Email"/>
</MultiBinding>
</TextBlock.Visibility>
<Run Text="{Binding Name}"/>
<Run Text="("/><Run Text="{Binding Email}"/><Run Text=")"/>
</TextBlock>
<TextBlock Text="{Binding Username}">
<TextBlock.Visibility>
<MultiBinding Converter="{StaticResource MultiNullOrEmptyStrToVisibility}" ConverterParameter="10">
<Binding Path="Name"/>
<Binding Path="Email"/>
</MultiBinding>
</TextBlock.Visibility>
</TextBlock>
</StackPanel>
</DataTemplate>
</ctrls:RadComboBoxExtended.ItemTemplate>
</ctrls:RadComboBoxExtended>
I would put the choice between name+email vs username in the ViewModel. (One of ViewModel responsibilities is to provide data for View in a convenient format)
public string SelectionText => String.IsNullOrEmpty(Name) && String.IsNullOrEmpty(Email)
? Username
: $"{Name} ({Email})" ;
much shorter DataTemplate and MultiValueConverter is not required
<ctrls:RadComboBoxExtended Grid.Row="0" Grid.Column="1" ItemsSource="{Binding CurrentValue.LIST_OF_USERS}" SelectedValue="{Binding CurrentValue.User}" focus:FocusExtension.IsFocused="{Binding Focuspoint}">
<ctrls:RadComboBoxExtended.ItemTemplate>
<DataTemplate>
<TextBlock Text="{Binding SelectionText}"/>
</DataTemplate>
</ctrls:RadComboBoxExtended.ItemTemplate>
</ctrls:RadComboBoxExtended>
Hi I am trying to achieve a binding like this:
<ComboBoxItem Style="{StaticResource ComboBoxItemStyle2}">
<ComboBoxItem.Content>
<MultiBinding StringFormat=" {}{0} {1}">
<Binding Path="Value" Source="{StaticResource Name}" />
<Binding Path="Name" Source="{StaticResource Person}" />
</MultiBinding>
</ComboBoxItem.Content>
</ComboBoxItem>
Where "Name" is a localized string and "Value" is used to get it's localized string.
for some reason this doesn't seems to work. I am getting empty string.
This might help you: String format using MultiBinding?
Taken from that post:
You are trying to bind a string to an object. But StringFormat requires its target to be a string type. Try putting a TextBlock in your content and bind your data to it.
Also put "" around Name.
Following is the corrected code:
<ComboBoxItem Style="{StaticResource ComboBoxItemStyle2}">
<TextBlock>
<TextBlock.Text>
<MultiBinding StringFormat="{}{0} {1}">
<Binding Path="Value" Source="{StaticResource Name}" />
<Binding Path="Name" Source="{StaticResource Person}" />
</MultiBinding>
</TextBlock.Text>
</TextBlock>
</ComboBoxItem>
I need to fix two things:
Keep the content as TextBlock and do binding of text there.
Removed extra spacing from StringFormat i.e. " {}{0} {1}" ==> "{}{0} {1}".
You Can see this link i wish be helpful
https://social.msdn.microsoft.com/Forums/vstudio/en-US/32b81578-b201-4927-bdc2-ebb9a42ae303/comboboxdisplaymemberpath-and-multibinding
I am seeing an issue with MultiBinding. Below is the code snippet
<StatusBar x:Name="messageBar">
<StatusBarItem>
<TextBlock x:Name="txtStatusMessage"
TextWrapping="Wrap" Foreground="Red" Height="35">
<TextBlock.Text>
<MultiBinding Converter="{StaticResource ConvertMultiple}"
UpdateSourceTrigger="PropertyChanged">
<Binding ElementName="txtUserFriendlyName"
Path="(Validation.Errors)[0].ErrorContent"
UpdateSourceTrigger="PropertyChanged"/>
<Binding ElementName="txtXPathValue"
Path="(Validation.Errors)[0].ErrorContent" />
<Binding ElementName="cboTagName"
Path="(Validation.Errors)[0].ErrorContent" />
</MultiBinding>
</TextBlock.Text>
</TextBlock>
</StatusBarItem>
The validation errors are shown initially fine. Then, I have code where I have txtStatusMessage.Text = "created successfully".
After this line is executed, when I give an invalid value, the multiBinding does not seem to working. The MultiValueConverter that I created is not called.
I am not sure what I am missing here. Any help is highly appreciated.
Regards,
rmanda
For part of a fairly-complex WPF ToolTip, I'm attempting to use a MultiBinding to produce formatted text based on two properties. The problem is, the binding's MultiConverter receives DependencyProperty.UnsetValue for each item in its values array.
The following works, using a single Binding:
<ToolTipService.ToolTip>
<StackPanel>
<TextBlock>
<TextBlock.Text>
<Binding Path="Amt" Converter="{StaticResource singleValueConverter}"/>
</TextBlock.Text>
</TextBlock>
</StackPanel>
</ToolTipService.ToolTip>
And so does this, using a MultiBinding with StringFormat:
<ToolTipService.ToolTip>
<StackPanel>
<TextBlock>
<TextBlock.Text>
<MultiBinding StringFormat='{0:C} in {1}'>
<Binding Path="Amt"/>
<Binding Path="Currency"/>
</MultiBinding>
</TextBlock.Text>
</TextBlock>
</StackPanel>
</ToolTipService.ToolTip>
But a MultiBinding with a Converter does not:
<ToolTipService.ToolTip>
<StackPanel>
<TextBlock>
<TextBlock.Text>
<MultiBinding Converter="{StaticResource multiValueConverter}">
<Binding Path="Amt"/>
<Binding Path="Currency"/>
</MultiBinding>
</TextBlock.Text>
</TextBlock>
</StackPanel>
</ToolTipService.ToolTip>
The bindings in the last example don't receive any value. This isn't the case outside of a ToolTip - what is going on such that binding fails in this specific case?
Try setting Mode="OneWay" on your binding.
Also, have you checked this problem and solution:
http://social.msdn.microsoft.com/Forums/en-IE/wpf/thread/15ada9c7-f781-42c5-be43-d07eb1f90ed4
The reason of this error is the
tooltips have not been loaded, so
DependencyProperty.GetValue returns
DependencyProperty.UnsetValue. You
should add some code to test that is
value is Dependency.UnsetValue. The
following code shows how to do this.
public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
{
if (values[0] == DependencyProperty.UnsetValue || values[1] == DependencyProperty.UnsetValue)
return "";
[...]
}
Try this:
<ToolTipService.ToolTip>
<StackPanel>
<TextBlock>
<TextBlock.Text>
<MultiBinding Converter="{StaticResource multiValueConverter}">
<MultiBinding.Bindings>
<BindingCollection>
<Binding Path="Amt"/>
<Binding Path="Currency"/>
</BindingCollection>
</MultiBinding.Bindings>
</MultiBinding>
</TextBlock.Text>
</TextBlock>
</StackPanel>
</ToolTipService.ToolTip>
I Have a listbox defined like below :
<ListBox x:Name="lstMedias" ItemsSource="{Binding Medias}" Width="Auto" Height="Auto">
<ListBox.ItemTemplate>
<DataTemplate>
<Button Content="{Binding Name}" Tag="{Binding Name}" Click="Button_Click" Command="{Binding Path=LoadSimpleMoviePopupCommand}">
<Button.Resources>
<Converters:LoadMovieMultiConverter x:Key="LoadMovieMultiConverter" />
</Button.Resources>
<Button.CommandParameter>
<MultiBinding Converter="{StaticResource LoadMovieMultiConverter}">
<MultiBinding.Bindings>
<Binding ElementName="DragDropCanvas" />
<Binding Path="Tag" RelativeSource="{RelativeSource Self}" />
</MultiBinding.Bindings>
</MultiBinding>
</Button.CommandParameter>
</Button>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
When Trying to call command LoadSimpleMoviePopupCommand, command is not called, but when calling click event, event is raised.
Do You have an idea why ? It is a normal behavior ? Do we have to trick like ListBoxItem doubleclick ?
Probably because the binding failed. Check the output window of VS and see if there are any binding errors. I suspect the LoadSimpleMoviePopupCommand property is not on your data item class (ie. your Media class).
had the same problem, try this
<Button Command="{Binding DataContext.YourCommand,RelativeSource={RelativeSource AncestorType={x:Type ListBox}}}"
it's quite normal, he can't find your command binding inside the listbox because you set something like
<DataTemplate DataType ...
in that listbox so he'll be looking for that binding inside the datatype and not the viewmodel (I assume :)