C#面向对象方式设置、读取应用配置

关注点：

1、用面向对象方式的方式(get,set)访问和设置配置项

2、“CallerMemberName”在.net 4以下的变通方式

最后一周了，大伙都进入过年模式了。身还在，心已远。最近事情不是很多，老是看闪存也是不对啊。于是想起来前几天看到的一篇文章：“在 .NET中，一种更方便操作配置项的方法”；于是跃跃欲试，尝试一下。结果遇到点问题，文章中使用了CallerMemberName属性来简化存取配置项时需要硬编码带上配置项的Key的问题，这个属性的用途就是标记在运行时自动获取属性名，但是这是.net 4.5以上才有的。由于我们做工控需要兼容工控机的老操作系统，.net一直是4.0。于是遇到兼容问题了。百度出来，发现杨中科老师的办法是使用StackTrace具体就是：“new StackTrace(true).GetFrame(1).GetMethod().Name”。于是对文章中的类进行了修改：

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public abstract class ConfigSetting : INotifyPropertyChanged
   {
       private void NotifyPropertyChanged(string property)
       {
           PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(property));
       }
       /// <summary>
       /// 配置类
       /// </summary>
       /// <param name="configuration">配置</param>
       public ConfigSetting(Configuration configuration)
       {
           Configuration = configuration;
       }
 
       /// <summary>
       /// 当前配置
       /// </summary>
       public Configuration Configuration
       {
           get;
       }
 
       public event PropertyChangedEventHandler PropertyChanged;
 
       /// <summary>
       /// 获取当前程序配置
       /// </summary>
       /// <param name="config"></param>
       /// <returns></returns>
       public static Configuration GetCurrentConfiguration()
       {
           return ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
       }
 
       /// <summary>
       /// 返回指定的配置项的值
       /// </summary>
       /// <param name="settingKey"></param>
       /// <returns></returns>
       protected virtual string GetSettingValue(string settingKey = null)
       {
           if (string.IsNullOrEmpty(settingKey))
               settingKey = new StackTrace(true).GetFrame(1).GetMethod().Name.Replace("get_", "");            
           return Configuration?.AppSettings?.Settings[settingKey]?.Value;
       }
 
       /// <summary>
       /// 返回指定的配置项的值
       /// </summary>
       /// <typeparam name="T">值类型</typeparam>
       /// <param name="settingKey"></param>
       /// <returns></returns>
       protected virtual T GetSettingValue<T>(string settingKey = null)
       {
           if (string.IsNullOrEmpty(settingKey))
               settingKey = new StackTrace(true).GetFrame(1).GetMethod().Name.Replace("get_", "");
           var value = GetSettingValue(settingKey);
           if (string.IsNullOrWhiteSpace(value))
           {
               return default(T);
           }
           else
           {
               return (T)Convert.ChangeType(value, typeof(T));
           }
       }
 
       /// <summary>
       /// 为指定的配置项设置值
       /// </summary>
       /// <param name="value"></param>
       /// <param name="settingKey"></param>
       protected virtual void SetSettingValue(object value, string settingKey = null)
       {
           if (string.IsNullOrEmpty(settingKey))
               settingKey = new StackTrace(true).GetFrame(1).GetMethod().Name.Replace("set_", "");
           Configuration.AddOrUpdateAppSettingItem(settingKey, value?.ToString());
           NotifyPropertyChanged(settingKey);
           Configuration.Save();
       }
 
       /// <summary>
       /// 返回指定的配置项的值
       /// </summary>
       /// <param name="settingKey"></param>
       /// <returns></returns>
       public string GetSettingValueByKey(string settingKey)
       {
           return GetSettingValue(settingKey);
       }
 
       /// <summary>
       /// 返回指定的配置项的值
       /// </summary>
       /// <param name="settingKey"></param>
       /// <returns></returns>
       public T GetSettingValueByKey<T>(string settingKey)
       {
           return GetSettingValue<T>(settingKey);
       }
 
       /// <summary>
       /// 为指定的配置项设置值
       /// </summary>
       /// <param name="value"></param>
       /// <param name="settingKey"></param>
       public void SetSettingValueByKey(string settingKey, object value)
       {
           SetSettingValue(value, settingKey);
           NotifyPropertyChanged(settingKey);
       }
   }