Web讀取指定的config文件的內容

需求:

何時會用到動態改變Web.config內的值?
在Web.config定義了一個全局設置值A,由於程序運行中知足了某個條件,要將A的值改變

Web.config中定義:

<appSettings>
    <add key="IsChangeDb" value="false"/>
  </appSettings>

 

獲取Web.config中指定配置:

//獲取web.config中 定義在appSetting中定義的配置
var item = ConfigurationManager.AppSettings["IsChangeDb"];

//根據我本身的須要轉換成bool值
bool isChangeDb = string.IsNullOrEmpty(ConfigurationManager.AppSettings["IsChangeDb"]) ? false : bool.Parse(ConfigurationManager.AppSettings["IsChangeDb"]);

 

代碼中更改Web.config中指定配置:

Configuration config=System.Web.Configuration.WebConfigurationManager.OpenWebConfiguration("~");
config.AppSettings.Settings.Remove("IsChangeDb");
config.AppSettings.Settings.Add("IsChangeDb", "true");
config.Save();

 

參考資料:

http://stackoverflow.com/questions/719928/how-do-you-modify-the-web-config-appsettings-at-runtime

 

 

出處：https://blog.csdn.net/qq_32452623/article/details/53580093

============================================================================

asp.net2.0新添加了對web.config直接操做的功能。開發的時候有可能用到在web.config裏設置配置文件，實際上是能夠經過程序來設置這些配置節的。

asp.net2.0須要添加引用：

using System.Web.Configuration;

web.config裏的配置節：

Code
  <appSettings>
    <add key="FilePath" value="g:\Test\WebConfigManager\Upload\" />
    <add key="p" value="g:\" />
  </appSettings>

（1）讀

string  filepath  =  ConfigurationManager.AppSettings[ " FilePath " ];

 

（2）添加

        Configuration config  =  WebConfigurationManager.OpenWebConfiguration( " /WebConfigManager " );
        AppSettingsSection app  =  config.AppSettings;
        app.Settings.Add( " p " ,  " p:\\ " );
        config.Save(ConfigurationSaveMode.Modified);

 

（3）修改

          Configuration config  =  WebConfigurationManager.OpenWebConfiguration( " /WebConfigManager " );
            AppSettingsSection app  =  config.AppSettings;
            app.Settings[ " p " ].Value  =   @" g:\ " ;
            config.Save(ConfigurationSaveMode.Modified);

 

（4）刪除

Configuration config  =  WebConfigurationManager.OpenWebConfiguration( " /WebConfigManager " );
        AppSettingsSection app  =  config.AppSettings;
        app.Settings.Remove( " p " );
        config.Save(ConfigurationSaveMode.Modified);

 

 

 

注意：

（1）asp.net用戶須要有讀取、修改、寫入的權限。

（2） WebConfigManager是web.config所在的文件夾名。

 

出處：https://www.cnblogs.com/xxtkong/archive/2011/10/14/2211793.html

==============================================================================

經過從網上的瞭解，和學習，咱們看到ConfigurationManager.OpenMappedExeConfiguration這個方法能夠用於打開指定的配置文件，那麼看看咱們用它來作一些事情吧，下面看代碼：

using System;
using System.Collections.Generic;
using System.Configuration;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Web.Configuration;



namespace PVG.Lib.Configs
{
    public class WebConfigHelper
    {
        /// <summary>
        /// 是否加密鏈接字符串
        /// </summary>
        public bool IsEncryptionConnection { get; set; }

        private Configuration config = null;
        public Configuration Configuration
        {
            get { return config; }
            set { config = value; }
        }



        public WebConfigHelper()
        {
            config = WebConfigurationManager.OpenWebConfiguration("~");
        }


        /// <summary>
        /// 讀取ConnectionStrings
        /// </summary>
        /// <param name="ConnName"></param>
        /// <returns></returns>
        public string GetConnectionStrings(string ConnName)
        {
            string res = "";
            if (config != null && config.ConnectionStrings.ConnectionStrings[ConnName] != null)
                res = config.ConnectionStrings.ConnectionStrings[ConnName].ConnectionString;
            return res;
        }

        public string SetConnectionStrings(string ConnName, string ConnValue)
        {
            return SetConnectionStrings(ConnName, ConnValue, "");
        }

        public string SetConnectionStrings(string ConnName, string ConnValue, string providerName)
        {
            if (config != null)
            {
                if (config.ConnectionStrings.ConnectionStrings[ConnName] != null)
                    config.ConnectionStrings.ConnectionStrings[ConnName].ConnectionString = ConnValue;
                else
                    config.ConnectionStrings.ConnectionStrings.Add(new ConnectionStringSettings(ConnName, ConnValue, providerName));
                config.Save(ConfigurationSaveMode.Modified);
            }
            if (IsEncryptionConnection)
                encryptionConn();//加密配置項
            return GetConnectionStrings(ConnName);

        }


        public string GetAppSettings(string keyName)
        {
            string res = "";
            if (config != null && config.AppSettings.Settings[keyName] != null)
                res = config.AppSettings.Settings[keyName].Value;
            return res;
        }


        public string SetAppSettings(string keyName, string keyValue)
        {
            if (config != null)
            {
                if (config.AppSettings.Settings[keyName] != null)
                    config.AppSettings.Settings[keyName].Value = keyValue;
                else
                    config.AppSettings.Settings.Add(keyName, keyValue);
                config.Save(ConfigurationSaveMode.Modified);
            }
            return GetAppSettings(keyName);

        }


        private void encryptionConn()
        {

            ConfigurationSection connectionSection = config.GetSection("connectionStrings");
            if (connectionSection != null)
            {
                connectionSection.SectionInformation.ProtectSection("RSAProtectedConfigurationProvider");
                config.Save();
            }
        }

    }
}

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