工作流Event
상속: System.EventArgs
 private void runtimeInstance_OnWfProcessStarted(object sender, WfEventArgs args)
 {
     _startedResult = args.WfExecutedResult;
     waitHandler.Set();
 }
 /// <summary>
 /// 事件回调
 /// </summary>
 /// <param name="runtimeType"></param>
 /// <param name="result"></param>
 internal void Callback(WfExecutedResult result)
 {
     WfEventArgs args = new WfEventArgs(result);
     _onWfProcessExecuted(this, args);
 }