关于C＃和ASP.NET中对App.config和Web.config文件里的[appSettings]和[connectionStrings]节点进行新增、修改、删除和读取相关的操作

最近我做的一些项目,经常需要用到对应用程序的配置文件操作,如app.config和web.config的配置文件,特别是对配置文件中的[appSettings]和[connectionStrings]两个节点常常进行新增、修改、删除和读取相关的操作的，所以,我自己就亲手把这些相关的操作都封装到一个配置文件管理器中,用静态的方法来调用便可,以下是我的实现,以资参考.

　　ps：后来我依据这个随笔中操作配置文档节点的方法扩展了其功能,使之能够针对所有的XML文档进行相关的节点或属性的读取,添加,修改,更新操作,

详情请参考我的另一篇随笔：这是一个关于XML文档的操作管理器XMLHelper类,类中包括XML文档的创建,文档节点和属性的读取,添加,修改,删除的方法功能的实现

//==============================================

//

// Copyright(C) 2009-2010 连林SoftWare工作室

// All Rights Reserved

//

// FileName: ConfigManager

// Description: 静态方法业务类，用于对C#、ASP.NET中的WinForm & WebForm 项目程序配置文件

// app.config和web.config的[appSettings]和[connectionStrings]节点进行新增、修改、删除和读取相关的操作。

//

// Author: Wang Lian Lin(王连林)

// CLR版本: 2.0.50727.42

// MachineName: WLL

// 注册组织名: WLL

// Created By Wang Lian Lin(王连林) at 2009-3-9 22:04:45

// Email: LianLin.Wang@163.com

// http://chnboy.cnblogs.com
//

//==============================================

using System;

using System.Data;

using System.Configuration;

using System.Web;

using System.Collections.Generic;

using System.Text;

using System.Xml;

public enum ConfigurationFile

{

AppConfig=1,

WebConfig=2

}

/// <summary>

/// ConfigManager 应用程序配置文件管理器

/// </summary>

public class ConfigManager

{

public ConfigManager()

{

//

// TODO: 在此处添加构造函数逻辑

//

}

/// <summary>

/// 对[appSettings]节点依据Key值读取到Value值，返回字符串

/// </summary>

/// <param name="configurationFile">要操作的配置文件名称,枚举常量</param>

/// <param name="key">要读取的Key值</param>

/// <returns>返回Value值的字符串</returns>

public static string ReadValueByKey(ConfigurationFile configurationFile, string key)

{

string value = string.Empty;

string filename = string.Empty;

if (configurationFile.ToString()==ConfigurationFile.AppConfig.ToString())

{

filename = System.Windows.Forms.Application.ExecutablePath + ".config";

}

else

{

filename = System.AppDomain.CurrentDomain.BaseDirectory + "web.config";

}

XmlDocument doc = new XmlDocument();

doc.Load(filename); //加载配置文件

XmlNode node = doc.SelectSingleNode("//appSettings"); //得到[appSettings]节点

////得到[appSettings]节点中关于Key的子节点

XmlElement element = (XmlElement)node.SelectSingleNode("//add[@key='" + key + "']");

if (element != null)

{

value = element.GetAttribute("value");

}

return value;

}

/// <summary>

/// 对[connectionStrings]节点依据name值读取到connectionString值，返回字符串

/// </summary>

/// <param name="configurationFile">要操作的配置文件名称,枚举常量</param>

/// <param name="name">要读取的name值</param>

/// <returns>返回connectionString值的字符串</returns>

public static string ReadConnectionStringByName(ConfigurationFile configurationFile, string name)

{

string connectionString = string.Empty;

string filename = string.Empty;

if (configurationFile.ToString() == ConfigurationFile.AppConfig.ToString())

{

filename = System.Windows.Forms.Application.ExecutablePath + ".config";

}

else

{

filename = System.AppDomain.CurrentDomain.BaseDirectory + "web.config";

}

XmlDocument doc = new XmlDocument();

doc.Load(filename); //加载配置文件

XmlNode node = doc.SelectSingleNode("//connectionStrings"); //得到[appSettings]节点

////得到[connectionString]节点中关于name的子节点

XmlElement element = (XmlElement)node.SelectSingleNode("//add[@name='" + name + "']");

if (element != null)

{

connectionString = element.GetAttribute("connectionString");

}

return connectionString;

}

/// <summary>

/// 更新或新增[appSettings]节点的子节点值，存在则更新子节点Value,不存在则新增子节点，返回成功与否布尔值

/// </summary>

/// <param name="configurationFile">要操作的配置文件名称,枚举常量</param>

/// <param name="key">子节点Key值</param>

/// <param name="value">子节点value值</param>

/// <returns>返回成功与否布尔值</returns>

public static bool UpdateOrCreateAppSetting(ConfigurationFile configurationFile, string key, string value)

{

bool isSuccess = false;

string filename = string.Empty;

if (configurationFile.ToString() == ConfigurationFile.AppConfig.ToString())

{

filename = System.Windows.Forms.Application.ExecutablePath + ".config";

}

else

{

filename = System.AppDomain.CurrentDomain.BaseDirectory + "web.config";

}

XmlDocument doc = new XmlDocument();

doc.Load(filename); //加载配置文件

XmlNode node = doc.SelectSingleNode("//appSettings"); //得到[appSettings]节点

try

{

////得到[appSettings]节点中关于Key的子节点

XmlElement element = (XmlElement)node.SelectSingleNode("//add[@key='" + key + "']");

if (element != null)

{

//存在则更新子节点Value

element.SetAttribute("value", value);

}

else

{

//不存在则新增子节点

XmlElement subElement = doc.CreateElement("add");

subElement.SetAttribute("key", key);

subElement.SetAttribute("value", value);

node.AppendChild(subElement);

}

//保存至配置文件(方式一)

using (XmlTextWriter xmlwriter = new XmlTextWriter(filename, null))

{

xmlwriter.Formatting = Formatting.Indented;

doc.WriteTo(xmlwriter);

xmlwriter.Flush();

}

isSuccess = true;

}

catch (Exception ex)

{

isSuccess = false;

throw ex;

}

return isSuccess;

}

/// <summary>

/// 更新或新增[connectionStrings]节点的子节点值，存在则更新子节点,不存在则新增子节点，返回成功与否布尔值

/// </summary>

/// <param name="configurationFile">要操作的配置文件名称,枚举常量</param>

/// <param name="name">子节点name值</param>

/// <param name="connectionString">子节点connectionString值</param>

/// <param name="providerName">子节点providerName值</param>

/// <returns>返回成功与否布尔值</returns>

public static bool UpdateOrCreateConnectionString(ConfigurationFile configurationFile, string name, string connectionString, string providerName)

{

bool isSuccess = false;

string filename = string.Empty;

if (configurationFile.ToString() == ConfigurationFile.AppConfig.ToString())

{

filename = System.Windows.Forms.Application.ExecutablePath + ".config";

}

else

{

filename = System.AppDomain.CurrentDomain.BaseDirectory + "web.config";

}

XmlDocument doc = new XmlDocument();

doc.Load(filename); //加载配置文件

XmlNode node = doc.SelectSingleNode("//connectionStrings"); //得到[connectionStrings]节点

try

{

////得到[connectionStrings]节点中关于Name的子节点

XmlElement element = (XmlElement)node.SelectSingleNode("//add[@name='" + name + "']");

if (element != null)

{

//存在则更新子节点

element.SetAttribute("connectionString", connectionString);

element.SetAttribute("providerName", providerName);

}

else

{

//不存在则新增子节点

XmlElement subElement = doc.CreateElement("add");

subElement.SetAttribute("name", name);

subElement.SetAttribute("connectionString", connectionString);

subElement.SetAttribute("providerName", providerName);

node.AppendChild(subElement);

}

//保存至配置文件(方式二)

doc.Save(filename);

isSuccess = true;

}

catch (Exception ex)

{

isSuccess = false;

throw ex;

}

return isSuccess;

}

/// <summary>

/// 删除[appSettings]节点中包含Key值的子节点，返回成功与否布尔值

/// </summary>

/// <param name="configurationFile">要操作的配置文件名称,枚举常量</param>

/// <param name="key">要删除的子节点Key值</param>

/// <returns>返回成功与否布尔值</returns>

public static bool DeleteByKey(ConfigurationFile configurationFile, string key)

{

bool isSuccess = false;

string filename = string.Empty;

if (configurationFile.ToString() == ConfigurationFile.AppConfig.ToString())

{

filename = System.Windows.Forms.Application.ExecutablePath + ".config";

}

else

{

filename = System.AppDomain.CurrentDomain.BaseDirectory + "web.config";

}

XmlDocument doc = new XmlDocument();

doc.Load(filename); //加载配置文件

XmlNode node = doc.SelectSingleNode("//appSettings"); //得到[appSettings]节点

////得到[appSettings]节点中关于Key的子节点

XmlElement element = (XmlElement)node.SelectSingleNode("//add[@key='" + key + "']");

if (element != null)

{

//存在则删除子节点

element.ParentNode.RemoveChild(element);

}

else

{

//不存在

}

try

{

//保存至配置文件(方式一)

using (XmlTextWriter xmlwriter = new XmlTextWriter(filename, null))

{

xmlwriter.Formatting = Formatting.Indented;

doc.WriteTo(xmlwriter);

xmlwriter.Flush();

}

isSuccess = true;

}

catch (Exception ex)

{

isSuccess = false;

}

return isSuccess;

}

/// <summary>

/// 删除[connectionStrings]节点中包含name值的子节点，返回成功与否布尔值

/// </summary>

/// <param name="configurationFile">要操作的配置文件名称,枚举常量</param>

/// <param name="name">要删除的子节点name值</param>

/// <returns>返回成功与否布尔值</returns>

public static bool DeleteByName(ConfigurationFile configurationFile, string name)

{

bool isSuccess = false;

string filename = string.Empty;

if (configurationFile.ToString() == ConfigurationFile.AppConfig.ToString())

{

filename = System.Windows.Forms.Application.ExecutablePath + ".config";

}

else

{

filename = System.AppDomain.CurrentDomain.BaseDirectory + "web.config";

}

XmlDocument doc = new XmlDocument();

doc.Load(filename); //加载配置文件

XmlNode node = doc.SelectSingleNode("//connectionStrings"); //得到[connectionStrings]节点

////得到[connectionStrings]节点中关于Name的子节点

XmlElement element = (XmlElement)node.SelectSingleNode("//add[@name='" + name + "']");

if (element != null)

{

//存在则删除子节点

node.RemoveChild(element);

}

else

{

//不存在

}

try

{

//保存至配置文件(方式二)

doc.Save(filename);

isSuccess = true;

}

catch (Exception ex)

{

isSuccess = false;

}

return isSuccess;

}

}