操作App.config与Web.config文件 - System.Configuration方式与XMLPath方式， 超强功能类

操作App.config与Web.config文件

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public class ConfigureAppConfig

{

//静态构造,不能实例化

static ConfigureAppConfig() { }



/// <summary>

/// 获取AppSettings配置节中的Key值

/// </summary>

/// <param name="keyName">Key's name</param>

/// <returns>Key's value</returns>

public static string GetAppSettingsKeyValue(string keyName)

{

return ConfigurationManager.AppSettings.Get(keyName);

}



/// <summary>

/// 获取ConnectionStrings配置节中的值

/// </summary>

/// <returns></returns>

public static string GetConnectionStringsElementValue()

{

ConnectionStringSettings settings = System.Configuration.ConfigurationManager.ConnectionStrings["connectionString"];

return settings.ConnectionString;

}



/// <summary>

/// 保存节点中ConnectionStrings的子节点配置项的值

/// </summary>

/// <param name="elementValue"></param>

public static void ConnectionStringsSave(string ConnectionStringsName, string elementValue)

{

System.Configuration.Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);

config.ConnectionStrings.ConnectionStrings["connectionString"].ConnectionString = elementValue;

config.Save(ConfigurationSaveMode.Modified);

ConfigurationManager.RefreshSection("connectionStrings");

}



/// <summary>

/// 判断appSettings中是否有此项

/// </summary>

private static bool AppSettingsKeyExists(string strKey, Configuration config)

{

foreach (string str in config.AppSettings.Settings.AllKeys)

{

if (str == strKey)

{

return true;

}

}

return false;

}



/// <summary>

/// 保存appSettings中某key的value值

/// </summary>

/// <param name="strKey">key's name</param>

/// <param name="newValue">value</param>

public static void AppSettingsSave(string strKey, string newValue)

{

System.Configuration.Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);

if (AppSettingsKeyExists(strKey, config))

{

config.AppSettings.Settings[strKey].Value = newValue;

config.Save(ConfigurationSaveMode.Modified);

ConfigurationManager.RefreshSection("appSettings");

}

}

}

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另外，也可用：

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public class AppSettings

{

public static string AppConfig()

{

return System.IO.Path.Combine(Application.StartupPath, "xxx.exe.config");

}



public static string GetValue(string appKey)

{

XmlDocument xDoc = new XmlDocument();

try

{

xDoc.Load(AppSettings.AppConfig());

XmlNode xNode = xDoc.SelectSingleNode("//appSettings");

XmlElement xElem = (XmlElement)xNode.SelectSingleNode("//add[@key='" + appKey + "']");

if (xElem != null)

return xElem.GetAttribute("value");

else

return "";

}

catch

{

return "";

}

}



public static void SetValue(string AppKey, string AppValue)

{

XmlDocument xDoc = new XmlDocument();

xDoc.Load(AppSettings.AppConfig());

XmlNode xNode = xDoc.SelectSingleNode("//appSettings");

XmlElement xElem1 = (XmlElement)xNode.SelectSingleNode("//add[@key='" + AppKey + "']");



if (xElem1 != null)

{

xElem1.SetAttribute("value", AppValue);

}

else

{

XmlElement xElem2 = xDoc.CreateElement("add");

xElem2.SetAttribute("key", AppKey);

xElem2.SetAttribute("value", AppValue);

xNode.AppendChild(xElem2);

}

xDoc.Save(AppSettings.AppConfig());

}

}