.NET Core读取配置文件方式详细总结

public class ConfigurationManager { /// <summary> /// 配置内容 /// </summary> private static NameValueCollection _configurationCollection = new NameValueCollection(); /// <summary> /// 配置监听响应链堆栈 /// </summary> private static Stack<KeyValuePair<string, FileSystemWatcher>> FileListeners = new Stack<KeyValuePair<string, FileSystemWatcher>>(); /// <summary> /// 默认路径 /// </summary> private static string _defaultPath = Directory.GetCurrentDirectory() + "//appsettings.json"; /// <summary> /// 最终配置文件路径 /// </summary> private static string _configPath = null; /// <summary> /// 配置节点关键字 /// </summary> private static string _configSection = "AppSettings"; /// <summary> /// 配置外连接的后缀 /// </summary> private static string _configUrlPostfix = "Url"; /// <summary> /// 最终修改时间戳 /// </summary> private static long _timeStamp = 0L; /// <summary> /// 配置外链关键词，例如：AppSettings.Url /// </summary> private static string _configUrlSection { get { return _configSection + "." + _configUrlPostfix; } } static ConfigurationManager() {  ConfigFinder(_defaultPath); } /// <summary> /// 确定配置文件路径 /// </summary> private static void ConfigFinder(string Path) {  _configPath = Path;  JObject config_json = new JObject();  while (config_json != null)  {  config_json = null;  FileInfo config_info = new FileInfo(_configPath);  if (!config_info.Exists) break;  FileListeners.Push(CreateListener(config_info));  config_json = LoadJsonFile(_configPath);  if (config_json[_configUrlSection] != null)   _configPath = config_json[_configUrlSection].ToString();  else break;  }  if (config_json == null || config_json[_configSection] == null) return;  LoadConfiguration(); } /// <summary> /// 读取配置文件内容 /// </summary> private static void LoadConfiguration() {  FileInfo config = new FileInfo(_configPath);  var configColltion = new NameValueCollection();  JObject config_object = LoadJsonFile(_configPath);  if (config_object == null || !(config_object is JObject)) return;    if (config_object[_configSection]!=null)  {  foreach (JProperty prop in config_object[_configSection])  {   configColltion[prop.Name] = prop.Value.ToString();  }  }    _configurationCollection = configColltion; } /// <summary> /// 解析Json文件 /// </summary> /// <param name="FilePath">文件路径</param> /// <returns></returns> private static JObject LoadJsonFile(string FilePath) {  JObject config_object = null;  try  {  StreamReader sr = new StreamReader(FilePath, Encoding.Default);  config_object = JObject.Parse(sr.ReadToEnd());  sr.Close();  }  catch { }  return config_object; } /// <summary> /// 添加监听树节点 /// </summary> /// <param name="info"></param> /// <returns></returns> private static KeyValuePair<string, FileSystemWatcher> CreateListener(FileInfo info) {  FileSystemWatcher watcher = new FileSystemWatcher();  watcher.BeginInit();  watcher.Path = info.DirectoryName;  watcher.Filter = info.Name;  watcher.IncludeSubdirectories = false;  watcher.EnableRaisingEvents = true;  watcher.NotifyFilter = NotifyFilters.Attributes | NotifyFilters.CreationTime | NotifyFilters.DirectoryName | NotifyFilters.FileName | NotifyFilters.LastAccess | NotifyFilters.LastWrite | NotifyFilters.Size;  watcher.Changed += new FileSystemEventHandler(ConfigChangeListener);  watcher.EndInit();  return new KeyValuePair<string, FileSystemWatcher>(info.FullName, watcher);   } private static void ConfigChangeListener(object sender, FileSystemEventArgs e) {  long time = TimeStamp();  lock (FileListeners)  {  if (time > _timeStamp)  {   _timeStamp = time;   if (e.FullPath != _configPath || e.FullPath == _defaultPath)   {   while (FileListeners.Count > 0)   {    var listener = FileListeners.Pop();    listener.Value.Dispose();    if (listener.Key == e.FullPath) break;   }   ConfigFinder(e.FullPath);   }   else   {   LoadConfiguration();   }  }  } } private static long TimeStamp() {  return (long)((DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc)).TotalMilliseconds * 100); } private static string c_configSection = null; public static string ConfigSection {  get { return _configSection; }  set { c_configSection = value; } } private static string c_configUrlPostfix = null; public static string ConfigUrlPostfix {  get { return _configUrlPostfix; }  set { c_configUrlPostfix = value; } } private static string c_defaultPath = null; public static string DefaultPath {  get { return _defaultPath; }  set { c_defaultPath = value; } } public static NameValueCollection AppSettings {  get { return _configurationCollection; } } /// <summary> /// 手动刷新配置，修改配置后，请手动调用此方法，以便更新配置参数 /// </summary> public static void RefreshConfiguration() {  lock (FileListeners)  {  //修改配置  if (c_configSection != null) { _configSection = c_configSection; c_configSection = null; }  if (c_configUrlPostfix != null) { _configUrlPostfix = c_configUrlPostfix; c_configUrlPostfix = null; }  if (c_defaultPath != null) { _defaultPath = c_defaultPath; c_defaultPath = null; }  //释放掉全部监听响应链  while (FileListeners.Count > 0)   FileListeners.Pop().Value.Dispose();  ConfigFinder(_defaultPath);  } } }