ConfigurationPropertyAttribute Classe

Definizione

public ref class ConfigurationPropertyAttribute sealed : Attribute

[System.AttributeUsage(System.AttributeTargets.Property)]
public sealed class ConfigurationPropertyAttribute : Attribute

[<System.AttributeUsage(System.AttributeTargets.Property)>]
type ConfigurationPropertyAttribute = class
    inherit Attribute

Public NotInheritable Class ConfigurationPropertyAttribute
Inherits Attribute

Ereditarietà

Object

Attribute

ConfigurationPropertyAttribute

Attributi

AttributeUsageAttribute

Esempio

Nell'esempio seguente viene illustrato come definire le proprietà di un oggetto personalizzato ConfigurationSection usando l'attributo ConfigurationPropertyAttribute .

L'esempio contiene due classi. La UrlsSection classe personalizzata usa l'oggetto ConfigurationPropertyAttribute per definire le proprie proprietà. La UsingConfigurationPropertyAttribute classe usa per UrlsSection leggere e scrivere la sezione personalizzata nel file di configurazione dell'applicazione.

using System;
using System.Configuration;

// Define a custom section.
// This class shows how to use the ConfigurationPropertyAttribute.
public class UrlsSection : ConfigurationSection
{
    [ConfigurationProperty("name", DefaultValue = "Contoso",
        IsRequired = true, IsKey = true)]
    public string Name
    {
        get
        {
            return (string)this["name"];
        }
        set
        {
            this["name"] = value;
        }
    }

    [ConfigurationProperty("url", DefaultValue = "http://www.contoso.com",
        IsRequired = true)]
    [RegexStringValidator(@"\w+:\/\/[\w.]+\S*")]
    public string Url
    {
        get
        {
            return (string)this["url"];
        }
        set
        {
            this["url"] = value;
        }
    }

    [ConfigurationProperty("port", DefaultValue = (int)0, IsRequired = false)]
    [IntegerValidator(MinValue = 0, MaxValue = 8080, ExcludeRange = false)]
    public int Port
    {
        get
        {
            return (int)this["port"];
        }
        set
        {
            this["port"] = value;
        }
    }
}

Imports System.Configuration


' Define a custom section.
' This class shows how to use the ConfigurationPropertyAttribute.
Public Class UrlsSection
    Inherits ConfigurationSection
    <ConfigurationProperty("name", DefaultValue:="Contoso", IsRequired:=True, IsKey:=True)>
    Public Property Name() As String
        Get
            Return CStr(Me("name"))
        End Get
        Set(ByVal value As String)
            Me("name") = value
        End Set
    End Property

    <ConfigurationProperty("url", DefaultValue:="http://www.contoso.com", IsRequired:=True), RegexStringValidator("\w+:\/\/[\w.]+\S*")>
    Public Property Url() As String
        Get
            Return CStr(Me("url"))
        End Get
        Set(ByVal value As String)
            Me("url") = value
        End Set
    End Property

    <ConfigurationProperty("port", DefaultValue:=0, IsRequired:=False), IntegerValidator(MinValue:=0, MaxValue:=8080, ExcludeRange:=False)>
    Public Property Port() As Integer
        Get
            Return CInt(Fix(Me("port")))
        End Get
        Set(ByVal value As Integer)
            Me("port") = value
        End Set
    End Property
End Class

using System;
using System.Configuration;

public class UsingConfigurationPropertyAttribute
{

    // Create a custom section and save it in the 
    // application configuration file.
    static void CreateCustomSection()
    {
        try
        {

            // Create a custom configuration section.
            UrlsSection customSection = new UrlsSection();

            // Get the current configuration file.
            System.Configuration.Configuration config =
                    ConfigurationManager.OpenExeConfiguration(
                    ConfigurationUserLevel.None);

            // Add the custom section to the application
            // configuration file.
            if (config.Sections["CustomSection"] == null)
            {
                config.Sections.Add("CustomSection", customSection);
            }

            // Save the application configuration file.
            customSection.SectionInformation.ForceSave = true;
            config.Save(ConfigurationSaveMode.Modified);

            Console.WriteLine("Created custom section in the application configuration file: {0}",
                config.FilePath);
            Console.WriteLine();
        }
        catch (ConfigurationErrorsException err)
        {
            Console.WriteLine("CreateCustomSection: {0}", err.ToString());
        }
    }

    static void ReadCustomSection()
    {
        try
        {
            // Get the application configuration file.
            System.Configuration.Configuration config =
                    ConfigurationManager.OpenExeConfiguration(
                    ConfigurationUserLevel.None) as Configuration;

            // Read and display the custom section.
            UrlsSection customSection =
                config.GetSection("CustomSection") as UrlsSection;
            Console.WriteLine("Reading custom section from the configuration file.");
            Console.WriteLine("Section name: {0}", customSection.Name);
            Console.WriteLine("Url: {0}", customSection.Url);
            Console.WriteLine("Port: {0}", customSection.Port);
            Console.WriteLine();
        }
        catch (ConfigurationErrorsException err)
        {
            Console.WriteLine("ReadCustomSection(string): {0}", err.ToString());
        }
    }
    
    static void Main(string[] args)
    {
       
        // Get the name of the application.
        string appName =
            Environment.GetCommandLineArgs()[0];

        // Create a custom section and save it in the 
        // application configuration file.
        CreateCustomSection();

        // Read the custom section saved in the
        // application configuration file.
        ReadCustomSection();

        Console.WriteLine("Press enter to exit.");

        Console.ReadLine();
    }
}

Imports System.Configuration

Public Class UsingConfigurationPropertyAttribute

    ' Create a custom section and save it in the 
    ' application configuration file.
    Private Shared Sub CreateCustomSection()
        Try

            ' Create a custom configuration section.
            Dim customSection As New UrlsSection()

            ' Get the current configuration file.
            Dim config As System.Configuration.Configuration = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None)

            ' Add the custom section to the application
            ' configuration file.
            If config.Sections("CustomSection") Is Nothing Then
                config.Sections.Add("CustomSection", customSection)
            End If


            ' Save the application configuration file.
            customSection.SectionInformation.ForceSave = True
            config.Save(ConfigurationSaveMode.Modified)

            Console.WriteLine("Created custom section in the application configuration file: {0}", config.FilePath)
            Console.WriteLine()

        Catch err As ConfigurationErrorsException
            Console.WriteLine("CreateCustomSection: {0}", err.ToString())
        End Try

    End Sub

    Private Shared Sub ReadCustomSection()
        Try
            ' Get the application configuration file.
            Dim config As System.Configuration.Configuration = TryCast(ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None), Configuration)

            ' Read and display the custom section.
            Dim customSection As UrlsSection = TryCast(config.GetSection("CustomSection"), UrlsSection)
            Console.WriteLine("Reading custom section from the configuration file.")
            Console.WriteLine("Section name: {0}", customSection.Name)
            Console.WriteLine("Url: {0}", customSection.Url)
            Console.WriteLine("Port: {0}", customSection.Port)
            Console.WriteLine()
        Catch err As ConfigurationErrorsException
            Console.WriteLine("ReadCustomSection(string): {0}", err.ToString())
        End Try

    End Sub

    Shared Sub Main(ByVal args() As String)

        ' Get the name of the application.
        Dim appName As String = Environment.GetCommandLineArgs()(0)

        ' Create a custom section and save it in the 
        ' application configuration file.
        CreateCustomSection()

        ' Read the custom section saved in the
        ' application configuration file.
        ReadCustomSection()

        Console.WriteLine("Press enter to exit.")

        Console.ReadLine()
    End Sub
End Class

Di seguito è riportato un estratto del file di configurazione contenente la sezione personalizzata come definito nell'esempio precedente.

<?xml version="1.0" encoding="utf-8"?>  
<configuration>  
    <configSections>  
        <section name="CustomSection" type="UrlsSection, UsingConfigurationPropertyAttribute, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" />  
    </configSections>  
    <CustomSection name="Contoso" url="http://www.contoso.com" />  
</configuration>  

Commenti

Si usa per ConfigurationPropertyAttribute decorare una proprietà di configurazione, che indicherà a .NET di creare un'istanza e inizializzare la proprietà usando il valore del parametro di decorazione.

Il sistema di configurazione .NET fornisce tipi di attributo che è possibile usare durante la creazione di elementi di configurazione personalizzati. Esistono due tipi di attributi:

1. I tipi che indicano a .NET come creare un'istanza delle proprietà dell'elemento di configurazione personalizzate. I tipi includono:

   • ConfigurationCollectionAttribute

   • ConfigurationPropertyAttribute

2. I tipi che indicano a .NET come convalidare le proprietà dell'elemento di configurazione personalizzate. I tipi includono:

   • IntegerValidatorAttribute

   • LongValidatorAttribute

   • RegexStringValidatorAttribute

   • StringValidatorAttribute

   • TimeSpanValidatorAttribute

Costruttori

Proprietà

Metodi

Implementazioni dell'interfaccia esplicita

Si applica a

Vedi anche

• ConfigurationProperty
• ConfigurationCollectionAttribute
• IntegerValidatorAttribute
• LongValidatorAttribute
• RegexStringValidatorAttribute
• StringValidatorAttribute
• TimeSpanValidatorAttribute