以前的好多代碼都丟失了，加上最近時間空一些，於是想起整理一下以前的個人半拉子項目，試試讓它們重生。自從養成了架構師視覺 搭建框架之后，越來 越看不上以前搭的框架了。先擼個上下文對象加上實現依賴注入。由於還是要依賴.net 4，所以像Autofac這樣的就用不了，於是仿照着實現了。
/// <summary>
/// 自定義應用程序上下文對象
/// </summary>
public class AppContextExt : IDisposable
{
/// <summary>
/// app.config讀取
/// </summary>
public Configuration AppConfig { get; set; }
/// <summary>
/// 真正的ApplicationContext對象
/// </summary>
public ApplicationContext Application_Context { get; set; }
//服務集合
public static Dictionary<Type, object> Services = new Dictionary<Type, object>();
//服務訂閱事件集合
public static Dictionary<Type, IList<Action<object>>> ServiceEvents = new Dictionary<Type, IList<Action<object>>>();
//上下文對象的單例
private static AppContextExt _ServiceContext = null;
private readonly static object lockObj = new object();
/// <summary>
/// 禁止外部進行實例化
/// </summary>
private AppContextExt()
{
}
/// <summary>
/// 獲取唯一實例，雙鎖定防止多線程並發時重復創建實例
/// </summary>
/// <returns></returns>
public static AppContextExt GetInstance()
{
if (_ServiceContext == null)
{
lock (lockObj)
{
if (_ServiceContext == null)
{
_ServiceContext = new AppContextExt();
}
}
}
return _ServiceContext;
}
/// <summary>
/// 注入Service到上下文
/// </summary>
/// <typeparam name="T">接口對象</typeparam>
/// <param name="t">Service對象</param>
/// <param name="servicesChangeEvent">服務實例更新時訂閱的消息</param>
public static void RegisterService<T>(T t, Action<object> servicesChangeEvent = null) where T : class
{
if (t == null)
{
throw new Exception(string.Format("未將對象實例化，對象名：{0}.", typeof(T).Name));
}
if (!Services.ContainsKey(typeof(T)))
{
try
{
Services.Add(typeof(T), t);
if (servicesChangeEvent != null)
{
var eventList = new List<Action<object>>();
eventList.Add(servicesChangeEvent);
ServiceEvents.Add(typeof(T), eventList);
}
}
catch (Exception ex)
{
throw ex;
}
}
if (!Services.ContainsKey(typeof(T)))
{
throw new Exception(string.Format("注冊Service失敗，對象名：{0}.", typeof(T).Name));
}
}
/// <summary>
/// 動態注入dll中的多個服務對象
/// </summary>
/// <param name="serviceRuntime"></param>
public static void RegisterAssemblyServices(string serviceRuntime)
{
if (serviceRuntime.IndexOf(".dll") != -1 && !File.Exists(serviceRuntime))
throw new Exception(string.Format("類庫{0}不存在！", serviceRuntime));
try
{
Assembly asb = Assembly.LoadFrom(serviceRuntime);
var serviceList = asb.GetTypes().Where(t => t.GetCustomAttributes(typeof(ExportAttribute), false).Any()).ToList();
if (serviceList != null && serviceList.Count > 0)
{
foreach (var service in serviceList)
{
var ifc = ((ExportAttribute)service.GetCustomAttributes(typeof(ExportAttribute), false).FirstOrDefault()).ContractType;
//使用默認的構造函數實例化
var serviceObject = Activator.CreateInstance(service, null);
if (serviceObject != null)
Services.Add(ifc, serviceObject);
else
throw new Exception(string.Format("實例化對象{0}失敗！", service));
}
}
else
{
throw new Exception(string.Format("類庫{0}里沒有Export的Service！", serviceRuntime));
}
}
catch (Exception ex)
{
throw ex;
}
}
/// <summary>
/// 獲取Service的實例
/// </summary>
/// <typeparam name="T">接口對象</typeparam>
/// <returns></returns>
public static T Resolve<T>()
{
if (Services.ContainsKey(typeof(T)))
return (T)Services[typeof(T)];
return default(T);
}
/// <summary>
/// 重置Service對象,實現熱更新
/// </summary>
/// <typeparam name="T">接口對象</typeparam>
/// <param name="t">新的服務對象實例</param>
public static void ReLoadService<T>(T t)
{
if (t == null)
{
throw new Exception(string.Format("未將對象實例化，對象名：{0}.", typeof(T).Name));
}
if (Services.ContainsKey(typeof(T)))
{
try
{
Services[typeof(T)] = t;
if (ServiceEvents.ContainsKey(typeof(T)))
{
var eventList = ServiceEvents[typeof(T)];
foreach (var act in eventList)
{
act.Invoke(t);
}
}
}
catch (Exception ex)
{
throw ex;
}
}
else if (!Services.ContainsKey(typeof(T)))
{
throw new Exception(string.Format("Service實例不存在！對象名：{0}.", typeof(T).Name));
}
}
/// <summary>
/// 激活上下文
/// </summary>
public void Start()
{
GetInstance();
}
/// <summary>
/// 激活上下文
/// </summary>
/// <param name="appContext">真正的ApplicationContext對象</param>
public void Start(ApplicationContext appContext)
{
Application_Context = appContext;
GetInstance();
}
/// <summary>
/// 激活上下文
/// </summary>
/// <param name="config">Configuration</param>
public void Start(Configuration config)
{
AppConfig = config;
GetInstance();
}
/// <summary>
/// 激活上下文
/// </summary>
/// <param name="appContext">真正的ApplicationContext對象</param>
/// <param name="config">Configuration</param>
public void Start(ApplicationContext appContext, Configuration config)
{
AppConfig = config;
Application_Context = appContext;
GetInstance();
}
/// <summary>
/// Using支持
/// </summary>
public void Dispose()
{
Services.Clear();
ServiceEvents.Clear();
if (Application_Context != null)
{
Application_Context.ExitThread();
}
}
}
使用：
AppContextExt.GetInstance().Start(); AppContextExt.RegisterAssemblyServices(AppDomain.CurrentDomain.BaseDirectory + "ModuleService.dll");
ILogService svr = AppContextExt.Resolve<ILogService>(); if (svr != null) svr.LogInfo("OK");
解決方案截圖：
