Shulou(Shulou.com)06/02 Report--

This article is about how VB.NET implements reflection. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

I will use the VB.NET reflection feature to build a class that automatically completes the save / read / write function of the initialization file. In this class, as long as the program author defines the internal member variables of the class according to the name of the program option (because this step still requires the programmer to manually code within the class, so it is called a semi-automatic initialization class), this class automatically saves / reads the program options from the initialization file, and the programmer no longer has to code the tedious part of the reading and writing file. Moreover, the construction of this class can have another benefit: since the options of the application are stored inside the class as member variables, programmers can query the options for initialization files using the ability to automatically list variable members provided by VS. For example, write string myAPPname= tobjAPPOption.General.APPName like this. As far as I know, it's not fun to remember the exact characters of a large number of program options.

VB.NET reflection function

The need to initialize the contents of the file. Let's first analyze and observe the contents of a standard windows initialization file, win.ini:

[windows] load= run= NullPort=None device=HP LaserJet 6L PCL,PCL5EMS3,\\ E***18B631240425\ HPLaserJ [Desktop] Wallpaper= (none) TileWallpaper=1 WallpaperStyle=0

The section of the initialization file enclosed in square brackets is called the section of the initialization file, and a series of program options with corresponding functions are organized under each section. For example, the desktop section contains desktop wallpaper (Wallpaper) / desktop wallpaper laying (WallpaperStyle) settings. Most of the program options in the initialization file can be saved with simple data types such as strings / numbers.

According to this requirement, considering that it is very convenient to use xml file in VB.NET at present, and using xml format can not only realize the function of conventional windows initialization file, but also have the advantage of tree structure organization, so the initialization file designed in this paper adopts xml file format. And define the elements of the XML file in the following format:

The definition of the Net object in the format used by the XML element. The definition of the Net object 'data content' array currently implemented in this class only supports the one-dimensional array 'element definition' of string. If the array array is nothing, the format is as follows: 'nothing' simple object definition 'int32, String, etc.' when SimpleObject represents elements in the array Objectname represents the dimension of the array, such as' ObjectName, ObjectType, Lenght'. Examples are as follows: 'for example, Redim mai32Test (7) As String' ObjectName takes the value of mai32Test,ObjectType as string [], and the value of Length is 8

In the VB.NET reflection function, you can enumerate the types and stored values of member variables contained in specific types of objects, which is often ignored by some ordinary programmers as not very useful. But in this article, this feature will be the core of building semi-automatic initialization objects, and we need this feature to automatically save or read the variable types and values written in the initialization class to the initialization file.

Thank you for reading! This is the end of this article on "how to achieve reflection in VB.NET". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, you can share it for more people to see!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.