我正在使用Steve Sanderson’s blog中描述的概念添加批量编辑系统.

这一切都按预期工作,但是,我在保存返回的任务列表时遇到问题.发布到我的BulkEdit循环返回列表并更新我的LinqTosql db任务列表中的每个项目.

我的BulkEdit视图继承了ViewPage< List< TaskList.Models.Task>>如下：

<% 
using (Html.BeginForm())
{
%>
        <div id="items">

<%
            foreach (var task in ViewData.Model)
            {
                Html.RenderPartial(
                    "TaskEditor",task,new ViewDataDictionary(ViewData)
                            {
                                {"prefix","tasks"}
                            }
                );
            }
%>

        </div>

        <input type="submit" value="Save changes" />

<%
    }
%>

TaskEditor控件继承System.Web.Mvc.ViewUserControl< Models.Task>看起来像这样：

<div>
<%= Html.Hidden(ViewData["prefix"] + ".index",ViewData.Model.Id) %>

<% var fieldPrefix = string.Format("{0}[{1}].",ViewData["prefix"],ViewData.Model.Id); %>

<%= Html.Hidden(fieldPrefix + "Id",ViewData.Model.Id) %>
Description:
<%= Html.TextBox(fieldPrefix + "TaskDescription",ViewData.Model.TaskDescription)%>
Date:
<%= Html.TextBox(fieldPrefix + "EntryDate",ViewData.Model.EntryDate.ToString("o"))%>   
Completed:
<%= Html.CheckBox(fieldPrefix + "IsCompleted",ViewData.Model.IsCompleted)%>
</div>

Controller Get和Post方法如下：

[AcceptVerbs(HttpVerbs.Get)]
    public ActionResult BulkEdit()
    {
        var tasks = from t in db.Tasks orderby t.EntryDate descending select t;

        return View(tasks.ToList());
    }        

    [AcceptVerbs(HttpVerbs.Post)]
    public ActionResult BulkEdit(IList<Task> tasks)
    {
        foreach(Task task in tasks)
        {
            foreach(Task dbTask in db.Tasks)
            {
                if (dbTask.Id == task.Id)
                {
                    dbTask.TaskDescription = task.TaskDescription;
                    dbTask.EntryDate = task.EntryDate;
                    dbTask.IsCompleted = task.IsCompleted;
                }
            }
        }

        db.SubmitChanges();

        return RedirectToAction("Index");
    }

我的问题是,这似乎太复杂了,我还没有考虑从列表中添加或删除的任务.我更喜欢做的事情

db.Tasks = tasks;

并让Linq尽一切努力来解决哪些已经改变以及哪些是新的/旧的.

这可能吗？或者我很快就会期待Linq有点太过分了？