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>
Related
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
This is the problem:
This is my XAML:
<TextBlock>
<TextBlock.Text>
<MultiBinding StringFormat="My binding is: ({0})">
<Binding Path="FieldThatDoesntExistYet"></Binding>
</MultiBinding>
</TextBlock.Text>
</TextBlock>
My datacontext is being loaded on run time, so It's end with the problem above.
Is there a simple XAML way to just show a default value ? empty or 0 will be great.
Adding a fallback value to your binding should do the trick. Whatever is between the '' will be what is displayed if the binding is invalid.
<TextBlock>
<TextBlock.Text>
<MultiBinding StringFormat="My binding is: ({0})">
<Binding Path="FieldThatDoesntExistYet" FallbackValue='0'></Binding>
</MultiBinding>
</TextBlock.Text>
</TextBlock>
I want to bind one property to multiple sources. My reason for this are things like this:
midpoint=point2.X - point1.X; //depends on two sources!
How could this be realised? As far as I know it's not directly possible out-of-the-box?
I believe what you are looking for is a MultiBinding.
From the MSDN documentation:
<TextBlock Name="textBox2" DataContext="{StaticResource NameListData}">
<TextBlock.Text>
<MultiBinding Converter="{StaticResource myNameConverter}"
ConverterParameter="FormatLastFirst">
<Binding Path="FirstName"/>
<Binding Path="LastName"/>
</MultiBinding>
</TextBlock.Text>
</TextBlock>
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!