data-binding - w3toppers.com

WPF + MVVM + RadioButton : How to handle binding with single property?

You need a IValueConverter. //define this in the Window’s Resources section or something similiarly suitable <local:GenderConverter x:Key=”genderConverterKey” /> <RadioButton Content=”M” IsChecked=”{Binding Gender, Converter={StaticResource ResourceKey=genderConverterKey}, ConverterParameter=M}” /> <RadioButton Content=”F” IsChecked=”{Binding Gender, Converter={StaticResource ResourceKey=genderConverterKey}, ConverterParameter=F}” /> The converter public class GenderConverter : IValueConverter { public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { return ((string)parameter … Read more

General Observable Dictionary Class for DataBinding/WPF C#

If you really want to make an ObservableDictionary, I’d suggest creating a class that implements both IDictionary and INotifyCollectionChanged. You can always use a Dictionary internally to implement the methods of IDictionary so that you won’t have to reimplement that yourself. Since you have full knowledge of when the internal Dictionary changes, you can use … Read more

How can I tell my DataTemplate to bind to a property in the PARENT ViewModel?

The answer is this: <DataTemplate x:Key=”CodeGenerationMenuTemplate”> <MenuItem Header=”{Binding Title}” Command=”{Binding DataContext.SwitchPageCommand, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Menu}}}” CommandParameter=”{Binding Title}”/> </DataTemplate> I just saw that Nir had given me the syntax to solve the above issue on this question: What is the best way in MVVM to build a menu that displays various pages?.

Can’t resolve Android databinding class

DataBinding class will be generated based on your xml file name. It is clearly mentioned in doc you are following. By default, a Binding class will be generated based on the name of the layout file, converting it to Pascal case and suffixing “Binding” to it. The above layout file was main_activity.xml so the generate … Read more

Best way for automatic databinding between database and user interface in java swing app?

This is a complex topic that might make a good Community Wiki. I’ve only scratched the surface, but NetBeans has an evolving capability in this area. It should be on your short list. See these help topics & links: Generating JPA Controller Classes from Entity Classes Binding Data to a Swing Component Java Persistence Tasks: … Read more

Binding to custom control inside DataTemplate for ItemsControl

The problem is that you explicitly set the DataContext of your UserControl to itself: DataContext=”{Binding Mode=OneWay, RelativeSource={RelativeSource Self}} Remove that assignment and write the ItemName binding like this: <TextBlock Text=”{Binding ItemName, RelativeSource={RelativeSource AncestorType=UserControl}}”/> or like this <TextBlock Text=”{Binding ItemName, ElementName=ItemRowControl}”/>

Is there a way to determine where a WPF Binding is declared/created?

When debugging WPF binding errors, I find it easiest to break up the error by the semicolons, and start from the end System.Windows.Data Error: 4 : Cannot find source for binding with reference ‘RelativeSource FindAncestor, AncestorType=”System.Windows.Controls.ItemsControl”, AncestorLevel=”1″‘. BindingExpression:Path=HorizontalContentAlignment; DataItem=null; target element is ‘MenuItem’ (Name=””); target property is ‘HorizontalContentAlignment’ (type ‘HorizontalAlignment’) So starting from the end: … Read more

How do I resolve the value of a databinding inside a MarkupExtension?

The toxvaerd’s answer is not universal. It breaks if the original binding already had a converter. Or when writing a converter is not possible. There’s a better solution. We can declare two constructors. The second one accepting BindingBase will be called by XAML when a binding is used. To resolve the value of the binding, … Read more

Databind a dropdownlist

string strQuery = “Select Item FROM Calendar Where UserD=’Test'”; Note you need to use single quotations around the string, as in your code you didn’t finish the inital string ever, so the rest of the code just became part of strQuery. In addition if you bring back more than one field in the future, when … Read more

Binding Image.Source to String in WPF?

Let’s break down what you’re doing. <Image Source=”{Binding ImageSource}” /> For this to work, the binding source needs to be either an ImageSource, or a string representing a URI to an image file. So let’s take a look at what the ImageSource property actually is. public string ImageSource { get; set; } One problem here … Read more