Multiple-windows: you can open multiple interactive windows in XAML using the show method. or open a new window while making other windows inactive using the showdialog method
User controls represented by the UserControl class, is the concept of grouping markup and code into a reusable container, so that the same interface, with the same functionality, can be used in several different places and even across several applications. A user control acts much like a WPF Window – an area where you can place other controls, and then a Code-behind file where you can interact with these controls. The file that contains the user control also ends with .xaml, and the Code-behind ends with .xaml.cs – just like a Window
IDataErrorInfo is an interface defined in System.ComponentModel namespace. The contract required implementing indexer and a string property named Error. it allows you to execute a validation on a control (i.e. validate the text value of a TextBox). when the validation fails- the control will have an invalid color (i.e. red). it is also possible to trigger an event which will modify the UI (in order to supply extra details for the user) in case of validation error, for example a tooltip message error like- “password must be at least 8 characters”
Custom dependency property: dependency properties are properties that are registered with the WPF property system by calling the Register method (or RegisterReadOnly), and that are backed by a DependencyProperty identifier field. Dependency properties can be used only by DependencyObject types( which is the majority of classes in WPF). you can create your own dependency property in order to add extra data to the control (or user control) and simplify the trigger events (which uses dependency properties)for ui modifications, such as styling
Final project Part II:
DB Generator – project part 2!
More topics covered:
- Multiple window – close current window
- User control – pass parameters
- User control – flip between controls
- Custom dependency property – initial value
- Validation error – trigger event
Links:
- Class code: HW solution list-box
- Class code: Multiple windows
- Class code: User control
- Class code: IDataErrorInfo
- Class code: Custom dependency property
- User control – tutorials point
- Validation using IDataErrorInfo – csharp corner
- Custom dependency property – tutorials point
- Lesson Summary Video!
dotnethacker.home.blog 