The difference between Winform and WPF and the specific use of WPF

WPF will be the development of Windows representation layer to the development of declarative language , and into a large number of animation and special effects , making it extremely difficult to do in Win32 rich client applications can be in WPF at hand , while replacing the bitmap with a vector map , the introduction of routed events (RoutedEvent) to the element tree for multi-layer listening , dynamic change of the control tree through the Dependency Property ( DependencyProperty) to dynamically change the control tree and so on. In WinForm program development, once the multi-threaded operation is involved, we generally can not have not seen the InvalidOperationException exception. This exception occurs in most cases due to the worker thread (sub-thread) to modify the main thread control (or object) of the properties of the illegal operation, of course, this practice is not always a failure, which depends on the sub-thread want to operate the object is not thread-safe.

The WinForm control provides an InvokeRequired property that determines whether the current thread is the thread that created the control. Once the control is created, InvokeRequired is efficient and safe. However, if the target control has not yet been created (the C# object already exists, but the underlying window handle is still null), then InvokeRequired can take a long time. (It traverses the control tree from bottom to top until it finds a parent control that can host the control and has already been instantiated and created, which ensures that the child control will be created in the same thread as the parent control. Once a suitable parent is found, the framework performs the same check, comparing the ID of the current thread with the ID of the thread that created the parent control.) If the framework is unable to find any of the created parent forms, then it needs to find some other type of form. If you can't find a form available in the hierarchy, then the framework will start looking for a parking window, which allows you not to be distracted by the strange behavior of some Win32 APIs. In short, some changes to a form (such as modifying some styles) require that the form be destroyed and recreated. A staging form is used to temporarily save the controls in the parent form while it is being destroyed and recreated. During this time, the UI thread runs only in the staging form.

Usually, WPF applications start with two threads: one for handling presentation and one for managing the UI. The presentation thread runs effectively hidden in the background, while the UI thread receives input, handles events, draws the screen, and runs the application code.

WPF is an acronym for Windows Presentation Foundation, which was originally code-named "Avalon", and because of the same combination of pinyin initials as "I'm impressed", some people in China have flirtatiously called it "I'm impressed". WPF is Microsoft's new generation of graphics systems, running under the .NET Framework 3.0 architecture, which provides a unified description and operation method for user interfaces, 2D/3D graphics, documents and media. Based on DirectX 9/10 technology, WPF not only brings unprecedented 3D interface, but also its graphics vector rendering engine greatly improves the traditional 2D interface, such as Vista in the semi-transparent effect of the form and so on are thanks to WPF. Programmers in the help of WPF, to develop a cool interface comparable to Mac programs is no longer a distant luxury. NET UI framework, integrated vector graphics, rich flow text support flow text support, 3D visual effects and a powerful control modeling framework.