小编Vit*_*liy的帖子

在 linq 表达式中检查 DateTime 是否为空的方法在哪里？我有 IEnumeable 方法，我从数据库中返回数据

return _requestRepository.ExecuteProcReader(
   myRequest,
   new SqlParameter("@userName", user)).Select(items => new Feed
{
   Id = (int)items[0],
   Title = items[1].ToString(),
   Body = items[2].ToString(),
   Link = items[3].ToString(),
   PubDate = (DateTime) items[4]
});

items[4] 是一个日期时间，在数据库中可以为空。那么，如何检查类似的东西

if(items[4] is DateTime)
{
   PubDate = (DateTime) items[4]
}

我有前任的标签。: <label id="labelId" class="control-label col-lg-4">Some text ()</label>, 我怎样才能在刹车中间插入文字，然后清除它？

我试过了 ：

$('#labelId').replace("()", "(new)");

但这对我不起作用

我正在尝试用asp.net mvc制作我的第一个web应用程序,包括带linq的远程数据库.所以我正在使用mvc的默认模板,我在AccountController中重新编写了使用linq实现注册用户的代码,现在我很有意思使用async.那么可以用异步处理linq吗？如果是的话,请告诉我如何做到这一点,这将对我非常有帮助.这是我通过linq注册的例子:

[AllowAnonymous]
public ActionResult Register()
{
    return View();
}

//
// POST: /Account/Register
[HttpPost]
[AllowAnonymous]
[ValidateAntiForgeryToken]
public ActionResult Register(RegisterViewModel model)
{
    if (ModelState.IsValid)
    {
        using (DataBaseClassDataContext dc = new DataBaseClassDataContext())
        {
            Users tbUsers = new Users();
            tbUsers.Login = model.Login;
            tbUsers.Name = model.Name;
            tbUsers.Surname = model.Surname;
            tbUsers.Password = model.Password;
            tbUsers.E_Mail = model.Email;
            tbUsers.Knowledge = model.Knowledge;
            dc.Users.InsertOnSubmit(tbUsers);
            dc.SubmitChanges();

            ModelState.Clear();
            ViewBag.Message = "Successfully Registration Done";
        }
    }

    // If we got this far, something failed, redisplay form
    return View(model);
}

我有3个表:users,feed(id,body,title,link)和userstofeed(id,userid,feedid,isread)而我试图读取userstofeed表布尔值,它带来的IndexOutOfRangeException.请告诉我,我做错了什么

while (reader.Read())
{
     rssFeed.Title = reader["title"].ToString();
     rssFeed.Body = reader["body"].ToString();
     rssFeed.Link = reader["link"].ToString();
     rssFeed.IsRead = (bool) reader["isread"]; //IndexOutOfRangeException here
     yield return rssFeed;
}

这里是sql store程序:

create proc spGetItemsByUser
@userName nvarchar(50)
as
begin
declare @userId int
declare @feedId table (id int)

select @userId = id 
from Users 
where name = @userName

insert into @feedid (id)
select feedid, isread 
from userstofeed 
where userid = @userId

select * from feed where id in (select id …

如何从kendo组合框值获得？我总是对它进行定义.我已经使用过这些变体,但它们并不适用于我

var selected = $('#typesCombo').data('kendoComboBox').val();
var selected = $('#typesCombo').data('kendoComboBox').value();
var selected = $('#typesCombo').data('kendoComboBox');

并得到如下错误: Cannot read property 'val' of undefined

这是我的代码:

JS:

$('#loadContainer').load("@Url.Action("Load", "Home")" + id);

var selected = $('#typesCombo').data('kendoComboBox').val();

if (selected == '') {
    ...
    }

HTML:

@(Html.Kendo().ComboBoxFor(x => x.Types.Name).Name("typesCombo")
                                             .DataTextField("Name")
                                             .DataValueField("Id")
                                             .HtmlAttributes(new { style = "width:100%", id = "typesCombo" })
                                             .BindTo(Model.TypesList))