C#操作配置文件app.config、web.config增删改

一、概述

应用程序配置文件,对于asp.net是 web.config,对于WINFORM程序是 App.Config(ExeName.exe.config)。

配置文件,对于程序本身来说,就是基础和依据,其本质是一个xml文件,对于配置文件的操作,从.NET 2.0 开始,就非常方便了,提供了 System [.Web] .Configuration 这个管理功能的命名空间,要使用它,需要添加对 System.configuration.dll的引用。

  • 对于WINFORM程序,使用 System.Configuration.ConfigurationManager;
  • 对于ASP.NET 程序, 使用 System.Web.Configuration.WebConfigurationManager;

二、配置文件



  
    
  

三、读取配置文件:

1. 读取值:

System.Configuration.ConfigurationManager.AppSettings[“y”];

Asp.Net程序:

System.Web.Configuration.WebConfigurationManager.AppSettings[“y”];

读取最新值:

Configuration config =  ConfigurationManager.OpenExeConfiguration(null);
AppSettingsSection app = config.AppSettings;
// 或者AppSettingsSection app =config.GetSection("AppSettings") as AppSettingsSection

Asp.Net程序读取值:

Configuration config = WebConfigurationManager.OpenWebConfiguration(null);
AppSettingsSection app = config.AppSettings;
// 或者AppSettingsSection app =config.GetSection("AppSettings") as AppSettingsSection;

2、查看值

    string y=app.Settings["y"].Value;
    foreach (string key in app.Settings)
    {
        Console.WriteLine(key+","+ app.Settings[key].Value);
    }

3、添加一项

Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
AppSettingsSection app = config.AppSettings;
app.Settings.Add("x", "this is X");
config.Save(ConfigurationSaveMode.Modified);

4、修改一项

Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
AppSettingsSection app = config.AppSettings;
//app.Settings.Add("x", "this is X");
app.Settings["x"].Value = "this is not Y";
config.Save(ConfigurationSaveMode.Modified);

5、删除一项

Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
AppSettingsSection app = config.AppSettings;
app.Settings.Remove("x");
config.Save(ConfigurationSaveMode.Modified);

说明:需要注意的是,代码所修改的并不是app.config,而是[Application_Name].exe.config这个文件。 
其中Application_Name就是你的可执行文件的文件名,而[Application_Name].exe.config才是真正起作用的配置文件。 
至于app.config,把它理解为是初始化配置文件比较合适。

四、连接字符串

1、读取连接字符串

ConnectionStringSettings conn=ConfigurationManager.ConnectionStrings["y"];

或者

Configuration config = ConfigurationManager.OpenExeConfiguration(null);
ConnectionStringsSection connSeciton = config.ConnectionStrings;
connSeciton.ConnectionStrings.Add(new ConnectionStringSettings("name", "connectionstring", "provider"));

2、加密字符串

public static void EncryptConnectionString(bool encrypt)
{
    Configuration configFile = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
    ConnectionStringsSection configSection = configFile.GetSection("connectionStrings") as ConnectionStringsSection;
    if ((!(configSection.ElementInformation.IsLocked)) && (!(configSection.SectionInformation.IsLocked)))
    {
        if (encrypt && !configSection.SectionInformation.IsProtected)       //encrypt is false to unencrypt
        {
            configSection.SectionInformation.ProtectSection("DataProtectionConfigurationProvider");
        }
        if (!encrypt && configSection.SectionInformation.IsProtected)
        {
            configSection.SectionInformation.UnprotectSection();    //encrypt is true so encrypt
        }
        configSection.SectionInformation.ForceSave = true;  //re-save the configuration file section
        configFile.Save();  // Save the current configuration.
    }
}

到此这篇关于C#操作配置文件app.config、web.config增删改的文章就介绍到这了。希望对大家的学习有所帮助,也希望大家多多支持脚本之家。

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