[英]Asp.Net MVC and ajax async callback execution order
我整天都在整理這個問題,希望有人可以幫助查明我的問題。 我使用ajax在我的應用程序中創建了“異步進度回調”類型功能。 當我將功能剝離到測試應用程序中時,我得到了所需的結果。 見下圖:
期望的功能
當我使用相同的代碼將功能綁定到我的單頁面應用程序時,我遇到了一種阻塞問題,其中所有請求僅在最后一個任務完成后才響應。 在上面的測試應用程序中,所有請求都按順序響應。 服務器報告所有請求的(“掛起”)狀態,直到控制器方法完成。 任何人都可以給我一個關於可能導致行為改變的暗示嗎?
不希望
期望的小提琴請求/響應
GET http://localhost:12028/task/status?_=1383333945335 HTTP/1.1
X-ProgressBar-TaskId: 892183768
Accept: */*
X-Requested-With: XMLHttpRequest
Referer: http://localhost:12028/
Accept-Language: en-US
Accept-Encoding: gzip, deflate
User-Agent: Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.1; Trident/6.0)
Connection: Keep-Alive
DNT: 1
Host: localhost:12028
HTTP/1.1 200 OK
Cache-Control: private
Content-Type: text/html; charset=utf-8
Vary: Accept-Encoding
Server: Microsoft-IIS/8.0
X-AspNetMvc-Version: 3.0
X-AspNet-Version: 4.0.30319
X-SourceFiles: =?UTF-8?B?QzpcUHJvamVjdHNcVEVNUFxQcm9ncmVzc0Jhclx0YXNrXHN0YXR1cw==?=
X-Powered-By: ASP.NET
Date: Fri, 01 Nov 2013 21:39:08 GMT
Content-Length: 25
Iteration completed...
不希望小提琴請求/響應
GET http://localhost:60171/_Test/status?_=1383341766884 HTTP/1.1
X-ProgressBar-TaskId: 838217998
Accept: */*
X-Requested-With: XMLHttpRequest
Referer: http://localhost:60171/Report/Index
Accept-Language: en-US
Accept-Encoding: gzip, deflate
User-Agent: Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.1; Trident/6.0)
Connection: Keep-Alive
DNT: 1
Host: localhost:60171
Pragma: no-cache
Cookie: ASP.NET_SessionId=rjli2jb0wyjrgxjqjsicdhdi; AspxAutoDetectCookieSupport=1; TTREPORTS_1_0=CC2A501EF499F9F...; __RequestVerificationToken=6klOoK6lSXR51zCVaDNhuaF6Blual0l8_JH1QTW9W6L-3LroNbyi6WvN6qiqv-PjqpCy7oEmNnAd9s0UONASmBQhUu8aechFYq7EXKzu7WSybObivq46djrE1lvkm6hNXgeLNLYmV0ORmGJeLWDyvA2
HTTP/1.1 200 OK
Cache-Control: private
Content-Type: text/html; charset=utf-8
Vary: Accept-Encoding
Server: Microsoft-IIS/8.0
X-AspNetMvc-Version: 4.0
X-AspNet-Version: 4.0.30319
X-SourceFiles: =?UTF-8?B?QzpcUHJvamVjdHNcSUxlYXJuLlJlcG9ydHMuV2ViXHRydW5rXElMZWFybi5SZXBvcnRzLldlYlxfVGVzdFxzdGF0dXM=?=
X-Powered-By: ASP.NET
Date: Fri, 01 Nov 2013 21:37:48 GMT
Content-Length: 25
Iteration completed...
除了auth令牌之外,兩個請求頭中唯一的區別是請求中的“ Pragma:no-cache ”和響應中的asp.net版本。
謝謝
更新 - 發布的代碼 (我可能需要指出此代碼來自Dino Esposito的文章 )
var ilProgressWorker = function () {
var that = {};
that._xhr = null;
that._taskId = 0;
that._timerId = 0;
that._progressUrl = "";
that._abortUrl = "";
that._interval = 500;
that._userDefinedProgressCallback = null;
that._taskCompletedCallback = null;
that._taskAbortedCallback = null;
that.createTaskId = function () {
var _minNumber = 100,
_maxNumber = 1000000000;
return _minNumber + Math.floor(Math.random() * _maxNumber);
};
// Set progress callback
that.callback = function (userCallback, completedCallback, abortedCallback) {
that._userDefinedProgressCallback = userCallback;
that._taskCompletedCallback = completedCallback;
that._taskAbortedCallback = abortedCallback;
return this;
};
// Set frequency of refresh
that.setInterval = function (interval) {
that._interval = interval;
return this;
};
// Abort the operation
that.abort = function () {
// if (_xhr !== null)
// _xhr.abort();
if (that._abortUrl != null && that._abortUrl != "") {
$.ajax({
url: that._abortUrl,
cache: false,
headers: { 'X-ProgressBar-TaskId': that._taskId }
});
}
};
// INTERNAL FUNCTION
that._internalProgressCallback = function () {
that._timerId = window.setTimeout(that._internalProgressCallback, that._interval);
$.ajax({
url: that._progressUrl,
cache: false,
headers: { 'X-ProgressBar-TaskId': that._taskId },
success: function (status) {
if (that._userDefinedProgressCallback != null)
that._userDefinedProgressCallback(status);
},
complete: function (data) {
var i=0;
},
});
};
// Invoke the URL and monitor its progress
that.start = function (url, progressUrl, abortUrl) {
that._taskId = that.createTaskId();
that._progressUrl = progressUrl;
that._abortUrl = abortUrl;
// Place the Ajax call
_xhr = $.ajax({
url: url,
cache: false,
headers: { 'X-ProgressBar-TaskId': that._taskId },
complete: function () {
if (_xhr.status != 0) return;
if (that._taskAbortedCallback != null)
that._taskAbortedCallback();
that.end();
},
success: function (data) {
if (that._taskCompletedCallback != null)
that._taskCompletedCallback(data);
that.end();
}
});
// Start the progress callback (if any)
if (that._userDefinedProgressCallback == null || that._progressUrl === "")
return this;
that._timerId = window.setTimeout(that._internalProgressCallback, that._interval);
};
// Finalize the task
that.end = function () {
that._taskId = 0;
window.clearTimeout(that._timerId);
}
return that;
};
更新1 -非常感謝John Saunders 。 我找到了這篇文章,解釋了約翰在關於序列化訪問的評論中所暗示的內容
“ 它會阻止並行執行,並強制並行請求一個接一個地執行,因為對ASP.NET會話狀態的訪問是每個會話獨占的 ”
我終於找到了解決辦法。 可以在Controller和/或Controller Method級別控制會話狀態。 由於授權在更高級別進行驗證,因此無需在我正在進行的操作中使用會話。 我只是為工作單元禁用它。
[SessionState(SessionStateBehavior.Disabled)]
public class _TestController : ProgressWorkerController
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.