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我有一個父三種數據類型 - >子 - >孫關係如下：優化填充嵌套手風琴
Mission -> Activity -> Project
其中它們包含關係的父ID的（即，「項目」包含一個「活動」 ID）。我有一些代碼用於生成jQuery嵌套手風琴設置，因此用戶可以點擊'任務'查看相關的'活動'，然後點擊'活動'查看相關的'項目'。
我點擊頁面從數據庫獲取數據然後填充頁面大約需要6秒的時間。這太長了，想盡可能優化我的代碼。使用miniprofiler（miniprofiler.com）我可以看到它使131調用數據庫有很多重複調用，但我確定爲什麼。
任何幫助你可以給我非常感謝！
LINQ查詢我用它來獲取所有數據，並組織它：
public IEnumerable<MissionWithActivities> GetTierTree()
{
var q = from mission in _context.tMissions
join activity in _context.tActivities on mission.id equals activity.missionId
join project in _context.tDefaultEventTypes on activity.id equals project.activityId
where !project.isRemoved && project.defaultCategoryId == 4
orderby mission.id, activity.id, mission.name
select new DefaultEventType(project.tierLevel.TryParseEnum<GanttType>(GanttType.Unknown), DefaultCategoryRepository.CreateFrom(project.tDefaultCategory))
{
AllowNumericSuffix = project.allowNumericSuffix,
AttachMilestoneMoniker = project.attachMilestoneMoniker,
Description = project.description,
Id = project.id,
IsReadOnly = project.isReadOnly,
IsSticky = project.isSticky,
Name = project.name,
Sid = project.sid,
Style = project.style.TryParseEnum<GanttElementStyle>(GanttElementStyle.Unknown),
TimeStamp = project.createdDT,
UpdatedTimeStamp = project.updatedDT,
Activity = new Activity { Id = activity.id, Name = activity.name, Mission = new Mission { Id = mission.id, Name = mission.name } }
};
var q2 = q.GroupBy(
e => e.Activity.Mission.Id,
(mid, events) => new MissionWithActivities
{
Mission = events.First().Activity.Mission,
Activities = events.GroupBy(
e => e.Activity.Id,
(aid, events2) => new ActivityWithEvents
{
Activity = events2.First().Activity,
Events = events2
})
});
return q2.ToList();
}
代碼隱藏我最初用來填充數據列表，然後嵌套手風琴：
public void SetTierTree(IEnumerable<MissionWithActivities> tierList)
{
dlMission.DataSource = tierList;
dlMission.DataBind();
}
public void dlMission_ItemDataBound(Object sender, DataListItemEventArgs e)
{
DataListItem item = e.Item;
MissionWithActivities mwa = (MissionWithActivities)item.DataItem;
var dlActivity = (DataList)item.FindControl("dlActivity");
dlActivity.DataSource = mwa.Activities;
dlActivity.DataBind();
var i = 0;
foreach (var project in mwa.Activities)
{
DataListItem pItem = dlActivity.Items[i];
var lbCreateNewProject = (LinkButton)pItem.FindControl("lbCreateNewProject");
lbCreateNewProject.CommandArgument = project.Activity.Id.ToString();
var dlProject = (DataList)pItem.FindControl("dlProject");
dlProject.DataSource = project.Events;
dlProject.DataBind();
i++;
var j = 0;
foreach (var data in project.Events)
{
DataListItem lblItem = dlProject.Items[j];
var lbEditProject = (LinkButton)lblItem.FindControl("lbEditProject");
var lbRemoveProject = (LinkButton)lblItem.FindControl("lbRemoveProject");
lbEditProject.CommandArgument = data.Id.ToString();
lbRemoveProject.CommandArgument = data.Id.ToString();
j++;
}
}
}
這是jQuery的.aspx頁面（我沒有刪除.net，所以它不會運行），但我想包括您的編碼：
$(document).ready(function() {
$("html").addClass("js");
$(".row").mouseover(function() { $(this).addClass("over"); }).mouseout(function() { $(this).removeClass("over"); });
$('h5').click(function() { $(this).prev(".heading_add").toggle(); });
$(".row:even").addClass("alt");
$.fn.accordion.defaults.container = false;
$(function() {
$("#acc1").accordion({
el: ".h",
head: "h4, h5",
next: "div",
initShow: "none"
});
$("html").removeClass("js");
});
});
<div id="main">
<ul id="acc1" class="accordion">
<asp:DataList ID="dlMission" runat="server" style="width:600px;">
<ItemTemplate>
<li>
<h4><%# Eval("Mission.Name") %></h4>
<div class="inner">
<ul>
<asp:DataList ID="dlActivity" runat="server">
<ItemTemplate>
<li>
<asp:LinkButton ID="lbCreateNewProject" CausesValidation="false" CssClass="heading_add" runat="server" Text="[ + ] Add New Project Type" OnCommand="lbCreateNewProject_OnCommand" />
<h5><%# Eval("Activity.Name") %></h5>
<div class="inner">
<asp:DataList ID="dlProject" runat="server">
<ItemTemplate>
<div class="row">
<%# Eval("Name") %><div class="action_buttons"><asp:LinkButton ID="lbEditProject" CausesValidation="false" runat="server" Text="Edit" OnCommand="lbEditProject_OnCommand" /> <asp:LinkButton ID="lbRemoveProject" CausesValidation="false" runat="server" Text="Remove" OnCommand="lbRemoveProject_OnCommand" /></div><br />
</div>
</ItemTemplate>
</asp:DataList>
</div>
</li>
</ItemTemplate>
</asp:DataList>
</ul>
</div>
</li>
</ItemTemplate>
</asp:DataList>
</ul>
</div>
對於好奇我使用jQuery.nestedAccordion.js插件來做到這一點。
與其讓131個DB調用只是在一次調用中拉下所有數據，然後通過查詢內存數據結構來構建樹。 – Servy
@Servy從我的LINQ聲明中發出131個DB調用嗎？我在猜測，也許每次我使用LINQ時，它都會再次訪問數據庫，但我無法確定。這聽起來正確嗎？ – Omni
既然你說過，''我可以看到它打了131次調用數據庫，並且有很多重複調用，但是**我確定爲什麼**。「顯然你已經確定它爲什麼會發生並且不需要幫助接着就，隨即。 – Servy