private void Application_BeginRequest(Object sender, EventArgs e)
{
HttpApplication app = sender as HttpApplication;
HttpWorkerRequest request = GetWorkerRequest(app.Context);
Encoding encoding = app.Context.Request.ContentEncoding;
int bytesRead = 0; // 已读数据大小
int read; // 当前读取的块的大小
int count = 8192; // 分块大小
byte[] buffer; // 保存所有上传的数据
string uploadId; // 唯一标志当前上传的ID
Progress progress; // 记录当前上传的进度信息
if (request != null)
{
// 返回 HTTP 请求正文已被读取的部分。
//
byte[] tempBuff = request.GetPreloadedEntityBody();
// 如果是附件上传
//
if (
tempBuff != null &&
IsUploadRequest(app.Request)
)
{
// 获取上传大小
//
long length = long.Parse(request.GetKnownRequestHeader(HttpWorkerRequest.HeaderContentLength));
// 当前上传的ID，用来唯一标志当前的上传
// 用此UploadID，可以通过其他页面获取当前上传的进度
//
uploadId = app.Context.Request.QueryString["UploadID"];
// 开始记录当前上传状态
//
progress = new Progress(length, uploadId);
progress.SetState(UploadState.ReceivingData);
buffer = new byte[length];
count = tempBuff.Length; // 分块大小
// 将已上传数据复制过去
//
Buffer.BlockCopy(tempBuff, 0, buffer, bytesRead, count);
// 开始记录已上传大小
//
bytesRead = tempBuff.Length;
progress.SetBytesRead(bytesRead);
SetProgress(uploadId, progress, app.Application);
// 循环分块读取，直到所有数据读取结束
//
while (request.IsClientConnected() &&
!request.IsEntireEntityBodyIsPreloaded() &&
bytesRead < length
)
{
// 如果最后一块大小小于分块大小，则重新分块
//
if (bytesRead + count > length)
{
count = (int)(length - bytesRead);
tempBuff = new byte[count];
}
// 分块读取
//
read = request.ReadEntityBody(tempBuff, count);
// 复制已读数据块
//
Buffer.BlockCopy(tempBuff, 0, buffer, bytesRead, read);
// 记录已上传大小
//
bytesRead += read;
progress.SetBytesRead(bytesRead);
SetProgress(uploadId, progress, app.Application);
}
if (
request.IsClientConnected() &&
!request.IsEntireEntityBodyIsPreloaded()
)
{
// 传入已上传完的数据
//
InjectTextParts(request, buffer);
// 表示上传已结束
//
progress.SetBytesRead(bytesRead);
progress.SetState(UploadState.Complete);
SetProgress(uploadId, progress, app.Application);
}
}
}
}
/// <summary>
/// 根据UploadID获取上传进度信息
/// </summary>
/// <param name="uploadId"></param>
/// <param name="application"></param>
/// <returns></returns>
public static Progress GetProgress(string uploadId, HttpApplicationState application)
{
Progress progress = application["OpenlabUpload_" + uploadId] as Progress;
return(progress);
}
