我在模型上设置了延迟加载。然而，性能似乎仍然有点慢。 有没有一种方法可以准确确定何时加载惰性对象？我的印象是它可能在我不希望它加载的时候加载。
如有任何帮助，我们将不胜感激。 让我知道代码示例是否有帮助 - 我会发布它们。
谢谢。
编辑:
这是相关代码。本质上，它列出了工作详细信息。有一些按钮可以加载时间表和工作记录数据(通过 ajax)。我原以为在此之前不会加载任何时间表或工作记录数据(但是，在添加 ObjectMaterialized 事件之后，它们似乎是)；
Controller :
public async Task<ActionResult> Index()
{
return View(await this._JobRepository.GetActiveByUserAsync(User.Identity.Name));
}
存储库:
public async Task<List<JobModel>> GetActiveByUserAsync(string user)
{
return await this.FindAllAsync(j => (j.AssignedTo.UserName == user || j.JobOwner.UserName == user) && j.Status == 2);
}
public async Task<List<JobModel>> FindAllAsync(Expression<Func<JobModel, bool>> match)
{
return await this._db.Jobs.Where(match).ToListAsync();
}
查看:
索引:
@using <Namepace>.Models
@model IEnumerable<JobModel>
@{
ViewBag.Title = "Jobs";
}
<div class="container">
<section id="searchSection">
<div class="searchField">
<div class="searchButton" onclick="searchJob()"></div>
<div><input id="searchTextBox" placeholder="ID | Name | Description | Customer" title="Search for a job's ID, Name, Description or Customer" /></div>
</div>
</section>
<section id="searchResultsSection" style="display:none;">
<div class="title">Search Results</div>
<div id="searchResults"></div>
</section>
<section id="myJobsSection">
<div class="title">My Jobs</div>
@Html.Partial("_JobDetailsListPartial", Model)
</section>
</div>
@section head {
@Styles.Render("~/Content/jobDetails.css")
@Scripts.Render("~/Scripts/jobDetailFunctions.js")
}
_JobDetailsListPartial:
@using <Namespace>.Models
@model IEnumerable<JobModel>
<div class="jobListContainer">
@foreach (JobModel job in Model)
{
@Html.Partial("_JobDetailsPartial", job);
}
</div>
@if (Model.Count() < 1)
{
<div style="padding:10px 20px 10px 20px;">No Results Found.</div>
}
_JobDetailsPartial:
@using <Namespace>.Models
@model JobModel
<section class="jobSection">
<section class="headerSection">
<div class="detailField" style="padding-bottom:20px">
<div class="fieldTitle">@Html.DisplayNameFor(m => m.ID)</div>
<div>@Html.DisplayFor(m => m.ID)</div>
<div class="detailButton expandButton" onclick="showHideExpandingSection(this, 'JobDetails')"></div>
</div>
<div class="detailField">
<div class="fieldTitle">@Html.DisplayNameFor(m => m.Name)</div>
<div>@Html.DisplayFor(m => m.Name)</div>
</div>
<div class="detailField">
<div class="fieldTitle">@Html.DisplayNameFor(m => m.Account)</div>
<div>@Html.DisplayFor(m => m.Account.Name)</div>
</div>
</section>
<section class="jobDetailsExpandingSection expandingSection" style="display:none;">
<section style="border-bottom: 1px solid #D8D8D8;">
<div class="detailField">
<div>@Html.DisplayNameFor(m => m.StatusName)</div>
<div>@Html.DisplayFor(m => m.StatusName)</div>
</div>
<div class="detailField">
<div>@Html.DisplayNameFor(m => m.Stage)</div>
<div>@Html.DisplayFor(m => m.Stage)</div>
</div>
<div class="detailField">
<div>@Html.DisplayNameFor(m => m.Type)</div>
<div>@Html.DisplayFor(m => m.Type)</div>
</div>
<div class="detailField">
<div>@Html.DisplayNameFor(m => m.Rate.Description)</div>
<div>@Html.DisplayFor(m => m.Rate.Description)</div>
</div>
<div class="detailField">
<div>@Html.DisplayNameFor(m => m.Rate.RatePerHour)</div>
<div>$@(Model.Rate.RatePerHour.HasValue ? Html.DisplayFor(m => m.Rate.RatePerHour) : new MvcHtmlString("0.00"))</div>
</div>
<div class="detailField">
<div>@Html.DisplayNameFor(m => m.JobPriority)</div>
<div>@Html.DisplayFor(m => m.JobPriority)</div>
</div>
<div class="detailField">
<div>@Html.DisplayNameFor(m => m.Account.Owner)</div>
<div>@Html.DisplayFor(m => m.Account.Owner.Name)</div>
</div>
<div class="detailField">
<div>@Html.DisplayNameFor(m => m.JobOwner)</div>
<div>@Html.DisplayFor(m => m.JobOwner.Name)</div>
</div>
<div class="detailField">
<div>@Html.DisplayNameFor(m => m.AssignedTo)</div>
<div>@Html.DisplayFor(m => m.AssignedTo.Name)</div>
</div>
<div class="detailField">
<div>@Html.DisplayNameFor(m => m.ScheduledDate)</div>
<div>@(Model.ScheduledDate.HasValue ? Html.DisplayFor(m => m.ScheduledDate) : new MvcHtmlString("Not Set"))</div>
</div>
<div class="detailField">
<div>@Html.DisplayNameFor(m => m.StartDate)</div>
<div>@(Model.StartDate.HasValue ? Html.DisplayFor(m => m.StartDate) : new MvcHtmlString("Not Set"))</div>
</div>
<div class="detailField">
<div>@Html.DisplayNameFor(m => m.DeadlineDate)</div>
<div>@(Model.DeadlineDate.HasValue ? Html.DisplayFor(m => m.DeadlineDate) : new MvcHtmlString("Not Set"))</div>
</div>
<div class="detailField">
<div>@Html.DisplayNameFor(m => m.FinishedDate)</div>
<div>@(Model.FinishedDate.HasValue ? Html.DisplayFor(m => m.FinishedDate) : new MvcHtmlString("Not Set"))</div>
</div>
</section>
<div class="expandingField">
<div>@Html.DisplayNameFor(m => m.CustomerContact)</div>
<div class="detailButton expandInnerButton" onclick="showHideExpandingSection(this, 'Contact')"></div>
</div>
<section class="customerExpandingSection expandingSection" style="display:none;border-bottom: 1px solid #D8D8D8;">
<div class="detailField">
<div>@Html.DisplayNameFor(m => m.CustomerContact.Name)</div>
<div>@Html.DisplayFor(m => m.CustomerContact.Name)</div>
</div>
<div class="detailField">
<div>@Html.DisplayNameFor(m => m.Address.Address)</div>
<div>@(!String.IsNullOrEmpty(Model.Address.Address) ? Html.DisplayFor(m => m.Address.Address) : new MvcHtmlString("Not Set"))</div>
</div>
<div class="detailField">
<div>@Html.DisplayNameFor(m => m.Address.City)</div>
<div>@(!String.IsNullOrEmpty(Model.Address.City) ? Html.DisplayFor(m => m.Address.City) : new MvcHtmlString("Not Set"))</div>
</div>
<div class="detailField">
<div>@Html.DisplayNameFor(m => m.Address.State)</div>
<div>@(!String.IsNullOrEmpty(Model.Address.State) ? Html.DisplayFor(m => m.Address.State) : new MvcHtmlString("Not Set"))</div>
</div>
<div class="detailField">
<div>@Html.DisplayNameFor(m => m.Address.Country)</div>
<div>@(!String.IsNullOrEmpty(Model.Address.Country) ? Html.DisplayFor(m => m.Address.Country) : new MvcHtmlString("Not Set"))</div>
</div>
<div class="detailField">
<div>@Html.DisplayNameFor(m => m.Address.PostCode)</div>
<div>@(!String.IsNullOrEmpty(Model.Address.PostCode) ? Html.DisplayFor(m => m.Address.PostCode) : new MvcHtmlString("Not Set"))</div>
</div>
<div class="detailField">
<div>@Html.DisplayNameFor(m => m.CustomerContact.Phone)</div>
<div>@(!String.IsNullOrEmpty(Model.CustomerContact.Phone) ? !String.IsNullOrEmpty(Model.CustomerContact.PhoneExtention) ? new MvcHtmlString("(" + Html.DisplayFor(m => m.CustomerContact.PhoneExtention) + ") " + Html.DisplayFor(m => m.CustomerContact.Phone)) : new MvcHtmlString("") : new MvcHtmlString("Not Set"))</div>
</div>
<div class="detailField">
<div>@Html.DisplayNameFor(m => m.CustomerContact.Mobile)</div>
<div>@(!String.IsNullOrEmpty(Model.CustomerContact.Mobile) ? Html.DisplayFor(m => m.CustomerContact.Mobile) : new MvcHtmlString("Not Set"))</div>
</div>
<div class="detailField">
<div>@Html.DisplayNameFor(m => m.CustomerContact.Email)</div>
<div>@(!String.IsNullOrEmpty(Model.CustomerContact.Email) ? Html.DisplayFor(m => m.CustomerContact.Email) : new MvcHtmlString("Not Set"))</div>
</div>
</section>
<div class="expandingField">
<div>@Html.DisplayNameFor(m => m.Description)</div>
<div class="detailButton expandInnerButton" onclick="showHideExpandingSection(this, 'JobDescription')"></div>
</div>
<section class="jobDescriptionExpandingSection expandingSection" style="display:none;border-bottom: 1px solid #D8D8D8;">
<div class="detailField">
<div>@Html.DisplayNameFor(m => m.Description)</div>
<div style="white-space: pre-line">@(!String.IsNullOrEmpty(Model.Description) ? Html.DisplayFor(m => m.Description) : new MvcHtmlString("Not Set"))</div>
</div>
</section>
<div class="expandingField">
<div>@Html.DisplayNameFor(m => m.Timesheets)</div>
<div class="detailButton expandInnerButton" onclick="showHideExpandingSection(this, 'JobTimesheets', @Model.ID)"></div>
</div>
<section id="TimesheetSection_@Model.ID" class="jobTimesheetsExpandingSection expandingSection" style="display:none;"></section>
<div class="expandingField">
<div>@Html.DisplayNameFor(m => m.JobNotes)</div>
<div class="detailButton expandInnerButton" onclick="showHideExpandingSection(this, 'JobNotes', @Model.ID)"></div>
</div>
<section class="jobNotesExpandingSection expandingSection" style="display:none;"></section>
</section>
</section>
型号:
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
namespace <Namespace>.Models
{
[Table("v_ITQJobs")]
public partial class JobModel
{
[Key]
[DatabaseGenerated(DatabaseGeneratedOption.None)]
[Display(Name = "Job ID:")]
[Column("JOBID")]
public int ID { get; set; }
[Display(Name = "Job Name:")]
[Column("JOBNAME")]
public string Name { get; set; }
[Column("ACCOUNTID")]
public int? AccountID { get; set; }
[Display(Name = "Customer:")]
public virtual CustomerModel Account { get; set; }
[Display(Name = "Job Description:")]
[Column("DESCRIPTION")]
public string Description { get; set; }
[Column("JOBOWNERID")]
public int? JobOwnerID { get; set; }
[Display(Name = "Owned By:")]
public virtual EmployeeModel JobOwner { get; set; }
[Column("USERID")]
public int? AssignedToID { get; set; }
[Display(Name = "Assigned To:")]
public virtual EmployeeModel AssignedTo { get; set; }
[Column("STATUSID")]
public int? Status { get; set; }
[Display(Name = "Status:")]
[Column("STATUSNAME")]
public string StatusName { get; set; }
[Display(Name = "Stage:")]
[Column("STAGENAME")]
public string Stage { get; set; }
[Display(Name = "Type:")]
[Column("TYPENAME")]
public string Type { get; set; }
public RateModel Rate { get; set; }
[Display(Name = "Priority:")]
[Column("JOBPRIORITY")]
public string JobPriority { get; set; }
[Column("SCHEDULEDDATETIME")]
[DisplayFormat(ApplyFormatInEditMode = true, DataFormatString = "{0:dd/MM/yyyy HH:mm}")]
[Display(Name = "Scheduled Date:")]
public DateTime? ScheduledDate { get; set; }
[Column("STARTDATETIME")]
[DisplayFormat(ApplyFormatInEditMode = true, DataFormatString = "{0:dd/MM/yyyy HH:mm}")]
[Display(Name = "Start Date:")]
public DateTime? StartDate { get; set; }
[Column("ETADATETIME")]
[DisplayFormat(ApplyFormatInEditMode = true, DataFormatString = "{0:dd/MM/yyyy HH:mm}")]
[Display(Name = "Deadline Date:")]
public DateTime? DeadlineDate { get; set; }
[Column("FINISHEDDATETIME")]
[DisplayFormat(ApplyFormatInEditMode = true, DataFormatString = "{0:dd/MM/yyyy HH:mm}")]
[Display(Name = "Finish Date:")]
public DateTime? FinishedDate { get; set; }
[Column("CONTACTID")]
public int? ContactID { get; set; }
[Display(Name = "Customer Contact")]
public virtual ContactModel CustomerContact { get; set; }
public AddressModel Address { get; set; }
[Display(Name = "Timesheets")]
public virtual ICollection<TimesheetModel> Timesheets { get; set; }
[Display(Name = "Job Notes")]
public virtual ICollection<ITQJobNoteModel> JobNotes { get; set; }
[Column("ISGLOBAL")]
public bool IsGlobal { get; set; }
[NotMapped]
public string GroupName {
get
{
return this.IsGlobal ? "Global Jobs" : "My Jobs";
}
}
[NotMapped]
public string Caption
{
get
{
if (this.ID != default(int))
return String.Format("{0} - {1}", this.ID, this.Name);
else
return null;
}
}
public JobModel()
{
this.JobNotes = new HashSet<ITQJobNoteModel>();
this.Timesheets = new HashSet<TimesheetModel>();
}
}
}
我怎样才能阻止它们加载，直到我希望它们加载？
最佳答案
您可以使用 ObjectContext.ObjectMaterialized事件，并在 DbContext 构造函数中订阅。
((IObjectContextAdapter)yourDbContext).ObjectContext.ObjectMaterialized += HandlerFunction;
关于asp.net-mvc - MVC EF 延迟加载 - 确定何时加载？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/30316169/