ConfigurationManager.AppSettings Properti

Definisi

Ruang nama:

System.Configuration

Rakitan:

System.Configuration.ConfigurationManager.dll

Paket:

System.Configuration.ConfigurationManager v8.0.0

Sumber:

ConfigurationManager.cs

AppSettingsSection Mendapatkan data untuk konfigurasi default aplikasi saat ini.

public:
 static property System::Collections::Specialized::NameValueCollection ^ AppSettings { System::Collections::Specialized::NameValueCollection ^ get(); };

public static System.Collections.Specialized.NameValueCollection AppSettings { get; }

static member AppSettings : System.Collections.Specialized.NameValueCollection

Public Shared ReadOnly Property AppSettings As NameValueCollection

Nilai Properti

NameValueCollection

Isi AppSettingsSection objek untuk konfigurasi default aplikasi saat ini.

Pengecualian

ConfigurationErrorsException

Tidak dapat mengambil NameValueCollection objek dengan data pengaturan aplikasi.

Contoh

Contoh pertama menunjukkan aplikasi konsol sederhana yang membaca pengaturan aplikasi, menambahkan pengaturan baru, dan memperbarui pengaturan yang ada.

using System;  
using System.Configuration;  

namespace ConsoleApplication1  
{  
    class Program  
    {  
        static void Main(string[] args)  
        {  
            ReadAllSettings();  
            ReadSetting("Setting1");  
            ReadSetting("NotValid");  
            AddUpdateAppSettings("NewSetting", "May 7, 2014");  
            AddUpdateAppSettings("Setting1", "May 8, 2014");  
            ReadAllSettings();  
        }  

        static void ReadAllSettings()  
        {  
            try  
            {  
                var appSettings = ConfigurationManager.AppSettings;  

                if (appSettings.Count == 0)  
                {  
                    Console.WriteLine("AppSettings is empty.");  
                }  
                else  
                {  
                    foreach (var key in appSettings.AllKeys)  
                    {  
                        Console.WriteLine("Key: {0} Value: {1}", key, appSettings[key]);  
                    }  
                }  
            }  
            catch (ConfigurationErrorsException)  
            {  
                Console.WriteLine("Error reading app settings");  
            }  
        }  

        static void ReadSetting(string key)  
        {  
            try  
            {  
                var appSettings = ConfigurationManager.AppSettings;  
                string result = appSettings[key] ?? "Not Found";  
                Console.WriteLine(result);  
            }  
            catch (ConfigurationErrorsException)  
            {  
                Console.WriteLine("Error reading app settings");  
            }  
        }  

        static void AddUpdateAppSettings(string key, string value)  
        {  
            try  
            {  
                var configFile = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);  
                var settings = configFile.AppSettings.Settings;  
                if (settings[key] == null)  
                {  
                    settings.Add(key, value);  
                }  
                else  
                {  
                    settings[key].Value = value;  
                }  
                configFile.Save(ConfigurationSaveMode.Modified);  
                ConfigurationManager.RefreshSection(configFile.AppSettings.SectionInformation.Name);  
            }  
            catch (ConfigurationErrorsException)  
            {  
                Console.WriteLine("Error writing app settings");  
            }  
        }  
    }  
}  

Imports System.Configuration  
Module Module1  

    Sub Main()  
        ReadAllSettings()  
        ReadSetting("Setting1")  
        ReadSetting("NotValid")  
        AddUpdateAppSettings("NewSetting", "May 7, 2014")  
        AddUpdateAppSettings("Setting1", "May 8, 2014")  
        ReadAllSettings()  
    End Sub  

    Sub ReadAllSettings()  
        Try  
            Dim appSettings = ConfigurationManager.AppSettings  

            If appSettings.Count = 0 Then  
                Console.WriteLine("AppSettings is empty.")  
            Else  
                For Each key As String In appSettings.AllKeys  
                    Console.WriteLine("Key: {0} Value: {1}", key, appSettings(key))  
                Next  
            End If  
        Catch e As ConfigurationErrorsException  
            Console.WriteLine("Error reading app settings")  
        End Try  
    End Sub  

    Sub ReadSetting(key As String)  
        Try  
            Dim appSettings = ConfigurationManager.AppSettings  
            Dim result As String = appSettings(key)  
            If IsNothing(result) Then  
                result = "Not found"  
            End If  
            Console.WriteLine(result)  
        Catch e As ConfigurationErrorsException  
            Console.WriteLine("Error reading app settings")  
        End Try  
    End Sub  

    Sub AddUpdateAppSettings(key As String, value As String)  
        Try  
            Dim configFile = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None)  
            Dim settings = configFile.AppSettings.Settings  
            If IsNothing(settings(key)) Then  
                settings.Add(key, value)  
            Else  
                settings(key).Value = value  
            End If  
            configFile.Save(ConfigurationSaveMode.Modified)  
            ConfigurationManager.RefreshSection(configFile.AppSettings.SectionInformation.Name)  
        Catch e As ConfigurationErrorsException  
            Console.WriteLine("Error writing app settings")  
        End Try  
    End Sub  

End Module  

Contoh sebelumnya mengasumsikan proyek Anda memiliki file App.config seperti yang ditunjukkan di bawah ini.

<?xml version="1.0" encoding="utf-8" ?>  
<configuration>  
    <startup>   
        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />  
    </startup>  
  <appSettings>  
    <add key="Setting1" value="May 5, 2014"/>  
    <add key="Setting2" value="May 6, 2014"/>  
  </appSettings>  
</configuration>  

Keterangan

Objek AppSettingsSection berisi konten bagian file appSettings konfigurasi.

Lihat juga

• AppSettingsSection
• NameValueCollection