两种读写配置文件的方案(app.config与web.config通用)
第一种方法：采用MS现有的ConfigurationManager来进行读写
using System.Configuration;
namespace Zwj.TEMS.Common
{
public abstract class ConfigHelper
{
private ConfigHelper()
{ }
/// <summary>
/// 获取配置值
/// </summary>
/// <param name="key"></param>
/// <returns></returns>
public static string GetAppSettingValue(string key)
{
return ConfigurationManager.AppSettings[key];
}
/// <summary>
/// 设置配置值（存在则更新，不存在则新增）
/// </summary>
/// <param name="key"></param>
/// <param name="value"></param>
public static void SetAppSettingValue(string key, string value)
{
var config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
var setting = config.AppSettings.Settings[key];
if (setting==null)
{
config.AppSettings.Settings.Add(key, value);
}
else
{
setting.Value = value;
}
config.Save(ConfigurationSaveMode.Modified);
ConfigurationManager.RefreshSection("appSettings");
}
/// <summary>
/// 删除配置值
/// </summary>
/// <param name="key"></param>
public static void RemoveAppSetting(string key)
{
var config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
config.AppSettings.Settings.Remove(key);
config.Save(ConfigurationSaveMode.Modified);
ConfigurationManager.RefreshSection("appSettings");
}
/// <summary>
/// 获取连接字符串
/// </summary>
/// <param name="name"></param>
/// <returns></returns>
public static string GetConnectionString(string name)
{
return ConfigurationManager.ConnectionStrings[name].ConnectionString;
}
/// <summary>
/// 设置连接字符串的值（存在则更新，不存在则新增）
/// </summary>
/// <param name="name"></param>
/// <param name="connstr"></param>
/// <param name="provider"></param>
public static void SetConnectionString(string name,string connstr, string provider)
{
var config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
ConnectionStringSettings connStrSettings = config.ConnectionStrings.ConnectionStrings[name];
if (connStrSettings != null)
{
connStrSettings.ConnectionString = connstr;
connStrSettings.ProviderName = provider;
}
else
{
connStrSettings = new ConnectionStringSettings(name, connstr, provider);
config.ConnectionStrings.ConnectionStrings.Add(connStrSettings);
}
config.Save(ConfigurationSaveMode.Modified);
ConfigurationManager.RefreshSection("connectionStrings");
}
/// <summary>
/// 删除连接字符串配置项
/// </summary>
/// <param name="name"></param>
public static void RemoveConnectionString(string name)
{
var config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
config.ConnectionStrings.ConnectionStrings.Remove(name);
config.Save(ConfigurationSaveMode.Modified);
ConfigurationManager.RefreshSection("connectionStrings");
}
}
}
注意：不能直接使用ConfigurationManager.AppSettings及ConfigurationManager.ConnectionStrings进行写操作（即：Add,Remove）,因为这两个属性是只读的，本人之前也疑惑，明明能够调用Add,Remove方法，但使用时却报错。
第二种方法：采用原生的XML+XPATH来读写（来源于网络）
//==============================================
// 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
{
////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;
}
}
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