In this post i will show the different ways of binding WPF control elements with the different sources. WPF provides binding both declarative and imperatively through code. It provides greater flexibility to the developer to bind the target value to source value in the XAML file.
The term data binding describes the process of creating a dependence for the value of one property i.e. the target property to the source property. The target property takes on the value of the source property. In some cases, changes to the source property are transmitted to the target immediately, but in some cases, they are not.
Following are the types of bindings that are the part of this post and mostly used in WPF applications.
1. Binding target value to WPF element.
2. Binding to an Object
3. Binding to Ancestor properties through RelativeSource property.
4. Binding to Data Sources
5. Binding to an Object with ObjectDataProvider
1. Binding Target value to WPF Element:
This type of binding used when you want to bind the target property to any WPF element (control) property. For e.g. you want to bind the Textbox text to the label Content property. When the user write in the textbox it should reflect the change in the label control. In this case, you add a textbox and a label controls in the WPF form. And specify the binding as follows.
Above code snippet shows the binding of Label Content target property with the Textbox Text source property. Now when you run the application and write something on textbox it will directly reflect the changes on the Label.
2. Binding to an Object
When binding to an Object we use Source property to specify the source object. For binding with object, in the Window.Resources tag user has to specify the Resource object. Below code snippet shows the way of binding an Object property with the resource object.
The above code snippet binds the StaticResource to the personObj which was defined in the Window.Resources tag and Path specified the property which holds the value. Now when run the application it will bind the TextBlock text value with the property value. When the form loads it initialize an object and fill the value obtained from that object property. If you want to pull data from some other datasource at runtime then you don’t need to specify the Binding Source property and only have to specify the Path property and in the code behind bind the TextBlock text source to that object value.
You can also specify the StaticResource binding property over Grid level or at container level. So you don’t need to specify the static resource property on every control bindings. All the controls that come under that container will use that datasource. But you need to specify the path which maps the property to that object property. Following snippet shows the way of binding through DataContext property at Container level.
3. Binding to Ancestor properties through RelativeSource property
Using the RelativeSource attribute in the binding you can bind the source to the ancestor property value. For example you have specified the Tag attribute in the Grid container. And you want to bind the Tag property in the Textbox control that comes under grid container. You can do that by using RelativeSource property. Following code snippet shows the way of binding to ancestor properites through RelativeSource property.
4. Binding to Data Sources
This is when you want to bind the Collection controls like Listbox etc. with different datasources.ListBox in WPF contains an ItemSource property which helps to bind the datasource. Normally in business application collection retrieves from database. So you dont need to specify the Source property in the Listbox ItemsSource property and just specify the Binding keyword followed with the DisplayMemberPath which is used to map the object property retrieved from the Collection to the control display item property.
Following code snippet shows the binding.
5. Binding to an Object with ObjectDataProvider
Using ObjectDataProvider class you can bind a WPF element to a method called on an object. You can specify an object type and a method on that type. WPF also provides an option to bind methods that have parameters in its signature and user can define the method parameters declaratively in XAML with their default values.
Below code snippet shows the way of binding method that contains no parameters in its signature.
In the code above first i created a method named GetText which return some string. And then I have specified the ObjectDataProvider tag and reference it in the TextBlock.
Below code snippet shows the way of binding method that contains two parameters in its signature.
Define method.
Specify ObjectDataProvider in the XAML.
When run the Application and enter the data in two textboxes, the Concat method takes the values from those textboxes and bind the returned concatenated string with the TextBlock as shown below.
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