我正在 ASP.Net Core 中编写文件上传,并尝试更新进度栏,但是当从 javascript 调用“进度”操作时,会话值未正确更新。
进度使用以下方式保存在用户会话中:
public static void StoreInt(ISession session, string key, int value)
{
session.SetInt32(key, value);
}
上传:
$.ajax(
{
url: "/Upload",
data: formData,
processData: false,
contentType: false,
type: "POST",
success: function (data) {
clearInterval(intervalId);
$("#progress").hide();
$("#upload-status").show();
}
}
);
获取进度值:
intervalId = setInterval(
function () {
$.post(
"/Upload/Progress",
function (progress) {
$(".progress-bar").css("width", progress + "%").attr("aria-valuenow", progress);
$(".progress-bar").html(progress + "%");
}
);
},
1000
);
上传动作:
[HttpPost]
public async Task<IActionResult> Index(IList<IFormFile> files)
{
SetProgress(HttpContext.Session, 0);
[...]
foreach (IFormFile file in files)
{
[...]
int progress = (int)((float)totalReadBytes / (float)totalBytes * 100.0);
SetProgress(HttpContext.Session, progress);
// GetProgress(HttpContext.Session) returns the correct value
}
return Content("success");
}
进展行动:
[HttpPost]
public ActionResult Progress()
{
int progress = GetProgress(HttpContext.Session);
// GetProgress doesn't return the correct value: 0 when uploading the first file, a random value (0-100) when uploading any other file
return Content(progress.ToString());
}