WPF配置文件读写

/// <summary>
/// 读取设置
/// </summary>
/// <param name="settingName"></param>
/// <returns></returns>
public static string GetSettingString(string settingName)
{
    try
    {
        string settingString = ConfigurationManager.AppSettings[settingName].ToString();
        return settingString;
    }
    catch (Exception)
    {
        return null;
    }
}

/// <summary>
/// 更新设置
/// </summary>
/// <param name="settingName"></param>
/// <param name="valueName"></param>
public static void UpdateSettingString(string settingName, string valueName)
{
    Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);

    if (ConfigurationManager.AppSettings[settingName] != null)
    {
        config.AppSettings.Settings.Remove(settingName);
    }
    config.AppSettings.Settings.Add(settingName, valueName);
    config.Save(ConfigurationSaveMode.Modified);
    ConfigurationManager.RefreshSection("appSettings");
}

using System;
using System.Configuration;
using System.IO;

namespace SchoolClient.Utils
{
    public static class ZConfigUtil
    {
        ///<summary>
        ///返回app.config文件中appSettings配置节的value项
        ///</summary>
        ///<param name="strKey"></param>
        ///<returns></returns>
        public static string GetVaule(string strKey)
        {
            return GetVaule(strKey, "app.config");
        }

        public static string GetVaule(string strKey, string filepath)
        {
            ExeConfigurationFileMap file = new ExeConfigurationFileMap();
            file.ExeConfigFilename = filepath;
            Configuration config = ConfigurationManager.OpenMappedExeConfiguration(file, ConfigurationUserLevel.None);
            foreach (string key in config.AppSettings.Settings.AllKeys)
            {
                if (key == strKey)
                {
                    return config.AppSettings.Settings[strKey].Value.ToString();
                }
            }
            return null;
        }

        ///<summary>
        ///在app.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 SetVaule(string newKey, string newValue)
        {
            SetVaule(newKey, newValue, "app.config");
        }

        public static void SetVaule(string newKey, string newValue, string filepath)
        {
            ExeConfigurationFileMap file = new ExeConfigurationFileMap();
            file.ExeConfigFilename = filepath;
            Configuration config = ConfigurationManager.OpenMappedExeConfiguration(file, ConfigurationUserLevel.None);
            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");
        }

        public static void test()
        {
            SetVaule("ServerIp", "127.0.0.1");
            SetVaule("ServerPort", "8899");
            Console.WriteLine("ServerIp：" + ZConfigUtil.GetVaule("ServerIp"));
            Console.WriteLine("ServerXXX：" + (ZConfigUtil.GetVaule("ServerXXX") == null));
        }
    }
}

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace SchoolClient.Utils
{
    internal class ZSignatureUtil
    {
        /// <summary>
        /// 读取文件
        /// </summary>
        /// <param name="filepath"></param>
        /// <returns></returns>
        public static string GetVaule(string filepath)
        {
            if (File.Exists(filepath))
            {
                try
                {
                    return System.IO.File.ReadAllText(filepath, Encoding.Default);
                }
                catch (Exception e)
                {
                    return null;
                }
            }
            else
            {
                return null;
            }
        }

        /// <summary>
        /// 写入文件
        /// </summary>
        /// <param name="newValue"></param>
        /// <param name="filepath"></param>
        public static void SetVaule(string newValue, string filepath)
        {
            FileInfo fi = new FileInfo(filepath);
            DirectoryInfo di = fi.Directory;
            if (!di.Exists)
            {
                di.Create();
            }

            System.IO.File.WriteAllText(filepath, newValue, Encoding.Default);
        }
    }
}