Question

C#如何读取config配置文件数据？

不用扯太多！就简单一句话，怎么读配置文件数据？
比如就一条数据<add key=hotelname value=深圳酒店>
怎么把它读出来？然后显示在listbox中。

Answer 1

代码如下：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Configuration;
using System.ServiceModel;
using System.ServiceModel.Configuration;
namespace NetUtilityLib
{
    public static class ConfigHelper
    {
        //依据连接串名字connectionName返回数据连接字符串  
        public static string GetConnectionStringsConfig(string connectionName)
        {
            //指定config文件读取
            string file = System.Windows.Forms.Application.ExecutablePath;
            System.Configuration.Configuration config = ConfigurationManager.OpenExeConfiguration(file);
            string connectionString =
                config.ConnectionStrings.ConnectionStrings[connectionName].ConnectionString.ToString();
            return connectionString;
        }
        ///<summary> 
        ///更新连接字符串  
        ///</summary> 
        ///<param name="newName">连接字符串名称</param> 
        ///<param name="newConString">连接字符串内容</param> 
        ///<param name="newProviderName">数据提供程序名称</param> 
        public static void UpdateConnectionStringsConfig(string newName, string newConString, string newProviderName)
        {
            //指定config文件读取
            string file = System.Windows.Forms.Application.ExecutablePath;
            Configuration config = ConfigurationManager.OpenExeConfiguration(file);
            bool exist = false; //记录该连接串是否已经存在  
            //如果要更改的连接串已经存在  
            if (config.ConnectionStrings.ConnectionStrings[newName] != null)
            {
                exist = true;
            }
            // 如果连接串已存在，首先删除它  
            if (exist)
            {
                config.ConnectionStrings.ConnectionStrings.Remove(newName);
            }
            //新建一个连接字符串实例  
            ConnectionStringSettings mySettings =
                new ConnectionStringSettings(newName, newConString, newProviderName);
            // 将新的连接串添加到配置文件中.  
            config.ConnectionStrings.ConnectionStrings.Add(mySettings);
            // 保存对配置文件所作的更改  
            config.Save(ConfigurationSaveMode.Modified);
            // 强制重新载入配置文件的ConnectionStrings配置节  
            ConfigurationManager.RefreshSection("ConnectionStrings");
        }
        ///<summary> 
        ///返回*.exe.config文件中appSettings配置节的value项  
        ///</summary> 
        ///<param name="strKey"></param> 
        ///<returns></returns> 
        public static string GetAppConfig(string strKey)
        {
            string file = System.Windows.Forms.Application.ExecutablePath;
            Configuration config = ConfigurationManager.OpenExeConfiguration(file);
            foreach (string key in config.AppSettings.Settings.AllKeys)
            {
                if (key == strKey)
                {
                    return config.AppSettings.Settings[strKey].Value.ToString();
                }
            }
            return null;
        }
        ///<summary>  
        ///在*.exe.config文件中appSettings配置节增加一对键值对  
        ///</summary>  
        ///<param name="newKey"></param>  
        ///<param name="newValue"></param>  
        public static void UpdateAppConfig(string newKey, string newValue)
        {
            string file = System.Windows.Forms.Application.ExecutablePath;
            Configuration config = ConfigurationManager.OpenExeConfiguration(file);
            bool exist = false;
            foreach (string key in config.AppSettings.Settings.AllKeys)
            {
                if (key == newKey)
                {
                    exist = true;
                }
            }
            if (exist)
            {
                config.AppSettings.Settings.Remove(newKey);
            }
            config.AppSettings.Settings.Add(newKey, newValue);
            config.Save(ConfigurationSaveMode.Modified);
            ConfigurationManager.RefreshSection("appSettings");
        }
        // 修改system.serviceModel下所有服务终结点的IP地址
        public static void UpdateServiceModelConfig(string configPath, string serverIP)
        {
            Configuration config = ConfigurationManager.OpenExeConfiguration(configPath);
            ConfigurationSectionGroup sec = config.SectionGroups["system.serviceModel"];
            ServiceModelSectionGroup serviceModelSectionGroup = sec as ServiceModelSectionGroup;
            ClientSection clientSection = serviceModelSectionGroup.Client;
            foreach (ChannelEndpointElement item in clientSection.Endpoints)
            {
                string pattern = @"\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\b";
                string address = item.Address.ToString();
                string replacement = string.Format("{0}", serverIP);
                address = Regex.Replace(address, pattern, replacement);
                item.Address = new Uri(address);
            }
            config.Save(ConfigurationSaveMode.Modified);
            ConfigurationManager.RefreshSection("system.serviceModel");
        }
        // 修改applicationSettings中App.Properties.Settings中服务的IP地址
        public static void UpdateConfig(string configPath, string serverIP)
        {
            Configuration config = ConfigurationManager.OpenExeConfiguration(configPath);
            ConfigurationSectionGroup sec = config.SectionGroups["applicationSettings"];
            ConfigurationSection configSection = sec.Sections["DataService.Properties.Settings"];
            ClientSettingsSection clientSettingsSection = configSection as ClientSettingsSection;
            if (clientSettingsSection != null)
            {
                SettingElement element1 = clientSettingsSection.Settings.Get("DataService_SystemManagerWS_SystemManagerWS");
                if (element1 != null)
                {
                    clientSettingsSection.Settings.Remove(element1);
                    string oldValue = element1.Value.ValueXml.InnerXml;
                    element1.Value.ValueXml.InnerXml = GetNewIP(oldValue, serverIP);
                    clientSettingsSection.Settings.Add(element1);
                }
                SettingElement element2 = clientSettingsSection.Settings.Get("DataService_EquipManagerWS_EquipManagerWS");
                if (element2 != null)
                {
                    clientSettingsSection.Settings.Remove(element2);
                    string oldValue = element2.Value.ValueXml.InnerXml;
                    element2.Value.ValueXml.InnerXml = GetNewIP(oldValue, serverIP);
                    clientSettingsSection.Settings.Add(element2);
                }
            }
            config.Save(ConfigurationSaveMode.Modified);
            ConfigurationManager.RefreshSection("applicationSettings");
        }
        private static string GetNewIP(string oldValue, string serverIP)
        {
            string pattern = @"\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\b";
            string replacement = string.Format("{0}", serverIP);
            string newvalue = Regex.Replace(oldValue, pattern, replacement);
            return newvalue;
        }
    }
}

Answer 2

String hotelname = ConfigurationManager.AppSettings["hotelname"];
需要在资源管理器的引用里面，添加System.Configuration，然后再在代码中添加 using System.Configuration;
才能使用。
.net 3.0以后，均需要引用 System.Configuration 才能访问配置文件。

追问

谢谢！但没看懂。我是第一次接触那玩意

追答

这个已经是最简单的了。
第一步，在右侧的资源管理器里，引用，添加引用，选择.net中的System.Configuration
第二步，在代码最前面，添加using System.Configuration;
第三步，在你想读取配置文件的地方，使用
String hotelname = ConfigurationManager.AppSettings["hotelname"];
变量hotelname读取的就是配置文件中你添加的值了。

追问

这个代码我会玩。
也怪我没说清楚。想用Xmltextread的方法读取。

追答

在代码第一行，加入using System.Xml;

XmlDocument xml = new XmlDocument();
string appPath = AppDomain.CurrentDomain.BaseDirectory;
xml.Load(appPath + "\\xxx.xml"); //XML地址
XmlElement xnode = (XmlElement)xml.SelectSingleNode("/configuration/add[@name='hotelname']");
String hotelname = xnode.GetAttribute("value");

Answer 3

例：
<add name="OracleConnStr" connectionString="Data Source=(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=192.168.1.111)(PORT=1521))(CONNECT_DATA=(SERVICE_NAME=BBS)));User ID=system;Password=123;" providerName="System.Data.OracleClient"/>
获取：
string connectionString = ConfigurationManager.ConnectionStrings["OracleConnStr"].ToString();
你看着办吧

追问

谢谢！但没看懂。我是第一次接触那玩意

Answer 4

不给分还这么硬气，哎，自己去搜吧