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我的 MVC 4 应用程序运行速度太慢时遇到问题。我安装了 Glimpse 来分析应用程序。我想我已经找到了问题的一部分：我的许多 EF 查询似乎运行了两次！这是我的 HomeController 正在拉一些警报：

[HttpGet]
    public virtual ActionResult Index()
    {
        var reportStart = DateTime.Today;
        var reportEnd = DateTime.Today.AddMonths(1);

        var query = _tameUow.Alerts
                            .FindBy(a => a.ApprovalStatusId == (int)AlertApprovalStatusCodes.Approved &&
                                    (a.ScheduledStartDateTime >= reportStart &&
                                     a.ScheduledStartDateTime <= reportEnd), a => a.SubmittedBy, a => a.ApprovalManager, a => a.ApprovalStatus);

        var model = ListAlertsViewModelBuilder.Build(query, null, false, false, false, false);

        model.RequiredViewData = new RequiredViewDataModel("Upcoming Alerts", "These are the upcoming active alerts for the next month.", "Home");
        return View(model);
    }

但是当我瞥见 SQL 选项卡时，它显示了两次查询！起初我以为这只是一个错误，同一个查询被显示了两次，但它们的执行时间不同，所以我认为查询实际上是运行了两次！此外，黄色的小感叹号显示为警告。我认为这是在警告我这是一个重复的查询...

http://i.imgur.com/jizQwKz.png 在此处输入图像描述 这里发生了什么？我在我测试过的所有页面上都看到了这一点，我选择了这个作为示例，因为它是最简单的。我尝试在查询上设置断点，它只被命中一次。

这是VMBuilder：

public static class ListAlertsViewModelBuilder
{
    public static ListAlertsViewModel Build
        (IQueryable<Alert> query
        , string curUserExtId
        , bool showSubmittedDateTime
        , bool showStatus
        , bool showActions
        , bool showOwners)
    {
        var model = new ListAlertsViewModel();

        var alerts = query.Select(a => new AlertDetailsViewModel() {
            AlertId = (int)a.AlertId,
            ApprovalManager = a.ApprovalManager,
            ApprovalManagerExtId = a.ApprovalManagerExtId,
            ApprovalStatus = a.ApprovalStatus,
            ApprovalStatusId = (int)a.ApprovalStatusId,
            Building = a.Building,
            Cause = a.Cause,
            //Comments = a.Comments,
            Impact = a.Impact,
            ScheduledEndDateTime = a.ScheduledEndDateTime,
            ScheduledStartDateTime = a.ScheduledStartDateTime,
            Service = a.Service,
            SubmittedBy = a.SubmittedBy,
            SubmittedByExtId = a.SubmittedByExtId,
            SubmittedDateTime = a.SubmittedDateTime,
            CurrentUserExtId = curUserExtId
        });

        model.ListAlerts = alerts;

        model.ShowSubmittedDateTime = showSubmittedDateTime;
        model.ShowStatus = showStatus;
        model.ShowActions = showActions;
        model.ShowOwners = showOwners;

        return model;
    }
}

这是我在存储库中使用的 FindBy 方法：

public IQueryable<T> FindBy(Expression<Func<T, bool>> predicate, params Expression<Func<T, object>>[] includeProperties)
    {
        IQueryable<T> query = this.Context.Set<T>();
        foreach (var include in includeProperties)
        {
            query.Include(include);
        }

        return query.Where(predicate);
    }
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