59 lines
2.6 KiB
C#
59 lines
2.6 KiB
C#
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using System.Reflection;
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using DispenserCommon.Ioc;
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using DispenserCommon.Utils;
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namespace DispenserCommon.Events;
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/// <summary>
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/// 通过事件管理者的方式来扫描系统内所有添加了注解的事件订阅者，并注册到事件总线上
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/// </summary>
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public class EventManager
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{
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/// <summary>
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/// 扫描所有带有 EventListener 注解的类，并注册到事件总线上
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/// Action回调方法 为 所有带有 EventAction 注解的方法
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/// 方法必须为两个参数的委托，第一个参数为事件类型，第二个参数为事件数据
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/// </summary>
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/// <exception cref="Exception"></exception>
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public static void RegListeners()
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{
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var listeners = AppDomain.CurrentDomain.GetAssemblies()
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.SelectMany(a => a.GetTypes()
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.Where(t => t.GetCustomAttributes(typeof(EventListener), true).Length > 0
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|| t.GetCustomAttributes(typeof(Component), true).Length > 0))
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.ToList();
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foreach (var listener in listeners)
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{
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// 扫描当前类中所有的带有 EventAction 特性的方法
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var methods = listener
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.GetMethods(BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Static | BindingFlags.Instance)
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.Where(m => m.GetCustomAttributes(typeof(EventAction), true).Length > 0)
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.ToList();
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foreach (var method in methods)
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{
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var handler = method.GetCustomAttribute<EventAction>();
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// 获取方法的参数类型
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var parameters = method.GetParameters();
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if (parameters.Length != 2) throw new Exception("订阅方法的参数必须为两个,第一个参数为事件类型，第二个参数为事件数据");
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// 获取参数类型
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var parameterType = parameters[1].ParameterType;
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var types = handler?.Types;
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if (types == null) continue;
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foreach (var type in types)
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{
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var actionType = typeof(Action<,>).MakeGenericType(typeof(EventType), parameterType);
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var instance = ServiceLocator.GetService(listener);
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var @delegate = method.CreateDelegate(actionType, instance);
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var eventBus = typeof(EventBus<>).MakeGenericType(parameterType);
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var addEventHandler = eventBus.GetMethod("AddEventHandler");
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addEventHandler?.Invoke(null, new object[] { type, @delegate });
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}
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}
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}
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}
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}
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