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This article mainly shows you "how to use VB.NET dynamic properties", the content is easy to understand, clear, hope to help you solve your doubts, the following let the editor lead you to study and learn "how to use VB.NET dynamic properties" this article.

Visual Basic .NET supports dynamic properties, which are stored in an application configuration file that will be read when the application executes. Using dynamic properties, you can change some property values without recompiling the application. You can use them to save database connection strings, application log information, or server connection information.

To see an example of the dynamic properties of VB.NET, first create a Windows application in Visual Basic. Add a TextBox to the default form; verify that TextBox is selected, and then locate the Dynamic property in the properties window.

Click the ellipsis button next to the Advanced tab to open a dialog box that lists all the properties of TextBox. Select the Text attribute and the key mapping box will be activated. The key mapping determines that the key stores the values in the configuration file. Click OK to close the dialog box.

The following code is generated in the InitializeComponent method (in the code generation area of the Windows Form designer). This code cannot be modified directly and can only be used in the properties window.

Dim configurationAppSettings

As _ _ System.Configuration.

AppSettingsReader = _ New

System.Configuration.

AppSettingsReader ()

Me.TextBox1.Text = CType

(_ configurationAppSettings.

GetValue ("TextBox1.Text"

_ GetType (System.String))

String)

The settings are stored in a file called app.cofig in XML format. The previous sample code produces the following XML code:

< ?xml version="1.0" encoding= "Windows-1252"?>

< configuration>

< appSettings>

< !-- User application and configured property settings go here.-->

< !-- Example: < add key=" settingName" value="settingValue"/>

->

< add key="TextBox1.Text" value="TextBox1" />

< /appSettings>

< /configuration>

When the application is compiled, the file is renamed to assembly.config, where assembly is the name of your compiled application. If you want to change these values, there is no need to recompile the program at all, as long as you simply edit the configuration file and change it to the corresponding value.

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