Asp.Net 无刷新文件上传并显示进度条的实现方法及(4)

public object AsyncState
        {
            get { return null; }
        }

public System.Threading.WaitHandle AsyncWaitHandle
        {
            get { return null; }
        }

public bool CompletedSynchronously
        {
            get { return false; }
        }

public bool IsCompleted
        {
            get { return isComplete; }
        }

#endregion

}

修改 RequestProgressAsyncHandler.ashx文件:

复制代码 代码如下:

    public class RequestProgressAsyncHandler : IHttpAsyncHandler
    {
        /// <summary>
        /// 保存异步处理状态信息的集合
        /// </summary>
        public static List<AsyncResult> AsyncResults = new List<AsyncResult>();
        public void ProcessRequest(HttpContext context)
        {
        }
        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
        #region IHttpAsyncHandler 成员

public IAsyncResult BeginProcessRequest(HttpContext context, AsyncCallback cb, object extraData)
        {

AsyncResult result = new AsyncResult(context, cb);
            AsyncResults.Add(result);
            return result;
        }

public void EndProcessRequest(IAsyncResult result)
        {
            //保证集合中只用一个元素
            AsyncResults.Clear();
            AsyncResult ar = (AsyncResult)result;
            ar.Send();
        }

#endregion
    }

在UploadFileHandler.ashx添加如下代码：

复制代码 代码如下:

        private static void SendPercentToClient(long percent)
        {
            //当上传完毕后，保证处理程序能向客户端传回
            while (RequestProgressAsyncHandler.AsyncResults.Count == 0 && percent == 100)
            {

}
            //因为本处理程序和"处理请求进度的程序"是并发的，不能保证RequestProgressAsyncHandler.AsyncResults一定含有子项
            if (RequestProgressAsyncHandler.AsyncResults.Count != 0)
            {
                RequestProgressAsyncHandler.AsyncResults[0].PercentNumber = percent;
                RequestProgressAsyncHandler.AsyncResults[0].DoCompleteTask();
            }
        }

在函数ProcessRequest中加入以上方法：

复制代码 代码如下: