C# ConfigHelper 辅助类介绍

//==============================================
//        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。

//==============================================
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
        {
    &nbs