小编win*_*how的帖子

我有一个动作方法,需要根据用户选择的日期完成15~52个长时间运行的SQL查询(所有这些查询都相似,每个查询完成时间超过5秒).

在做了大量研究之后,似乎在不阻塞ASP.Net线程的情况下执行此操作的最佳方法是使用async/await任务方法使用SQL查询:

[HttpPost]
public async Task<JsonResult> Action() {   
    // initialization stuff

    // create tasks to run async SQL queries
    ConcurrentBag<Tuple<DateTime, List<long>>> weeklyObsIdBag = 
        new ConcurrentBag<Tuple<DateTime, List<long>>>();
    Task[] taskList = new Task[reportDates.Count()];
    int idx = 0;
    foreach (var reportDate in reportDates) { //15 <= reportDates.Count() <= 52
        var task = Task.Run(async () => {
            using (var sioDbContext = new SioDbContext()) {
                var historyEntryQueryable = sioDbContext.HistoryEntries
                    .AsNoTracking()
                    .AsQueryable<HistoryEntry>();
                var obsIdList = await getObsIdListAsync(
                    historyEntryQueryable, 
                    reportDate
                );
                weeklyObsIdBag.Add(new Tuple<DateTime,List<long>>(reportDate, obsIdList));
            }
        });
        taskList[idx++] …