1 public interface IReusedObject
2 {
3     bool IsOnUsing{get;set;}
4 }

public override object GetInstance()
{
    IReusedObject retValue = null;
    DateTime now;
    //累计循环次数
    int count = 3;
    //循环因子
    int i = 0;
    //先到组件池中查找可用的对象
    lock (this._Lock)
    {
        while (true && i++ < count)
        {
            now = DateTime.Now;
            //先从组件池中获取对象
            retValue = this._ListInstance.Find(obj => !obj.IsOnUsing);
            //如果能够获取到，则直接返回
            if (retValue != null)
            {
#if DEBUG
Common.InnerLogHelper.WriteLog("Get instance from pool by PooledIocType[Current Count = " + this.InstanceCount.ToString() + "].", "SAS.Utilities.IOC.IocType.GetInstance()");
#endif
                retValue.LastVisitTime = now;
                retValue.IsOnUsing = true;
                break;
            }
            //否则，如果组件池的还没装满，则重新创建对象实例，并放入组件池中
            else if (this._ListInstance.Count < this.Capacity)
            {
                retValue = base.CreateInstance() as IReusedObject;
                if (retValue == null)
                {
                    throw new Exception("Type[" + base.Type.FullName + "] must implement from IReusedObject interfact.");
                }
                else
                {
#if DEBUG
Common.InnerLogHelper.WriteLog("Create a new instance by PooledIocType[Current Count = " + this.InstanceCount.ToString() + "].", "SAS.Utilities.IOC.IocType.GetInstance()");
#endif
                    this._ListInstance.Add(retValue);
                    break;
                }
            }
            //否则移除组件池中超时的对象，然后进入下一次循环
            else
            {
                //移除超时对象
                this._ListInstance.RemoveAll(obj => obj.LastVisitTime.AddMilliseconds(obj.TimeOut) < now);
                Thread.Sleep(10);
                continue;
            }
        }
    }
    if (retValue == null)
    {
        throw new Exception("Get obj from pool timeout.");
    }
    return retValue;
}