C# 序列在mvc上不包含任何元素
我不知道为什么我得到的序列不包含任何元素,我有点像一个新的mvc 我的控制器C# 序列在mvc上不包含任何元素,c#,asp.net-mvc-4,C#,Asp.net Mvc 4,我不知道为什么我得到的序列不包含任何元素,我有点像一个新的mvc 我的控制器 [HttpPost] public ActionResult DeleteAnnounce(string announce) { using (var db = new HarmonyMainServerDbContext()) { ANNOUNCEMENT anno
[HttpPost]
public ActionResult DeleteAnnounce(string announce)
{
using (var db = new HarmonyMainServerDbContext())
{
ANNOUNCEMENT annoude = db.Announcer.First(c => c.AnnounceTitle == announce);
db.Announcer.Remove(annoude);
db.SaveChanges();
}
return RedirectToAction("ViewAnnounce");
}
我的观点
<div id="clientDetailsContainer">
@using (Html.BeginForm("Announcements", "Admin", FormMethod.Post, new { id = "Announcers" }))
{
@Html.AntiForgeryToken()
@Html.ValidationSummary(true)
<div class="module-controls" style="display:block;">
<a href="/Admin/ViewAnnounce" class="k-button module-action"><img src="../Images/src/back.png"/><span>Back to List</span></a>
<a class="k-button module-action" id="submitSave" title="haha"><img src="../Images/src/subgrid_save.png"/><span>Save</span></a>
<a class="k-button module-action" id="submitDelete" ><img src="../Images/src/subgrid_save.png"/><span>Delete</span></a>
</div>
<h2>Announcement</h2>
@Html.HiddenFor(model => model.AnnounceID)
<div class="client-details" style="margin-left: 50px">
<p>
<label class="label-ant">Announcement Title</label>
@Html.TextBoxFor(model => model.AnnounceTitle, new {@class="k-textbox", @style="width:250px" })
@Html.ValidationMessageFor(model => model.AnnounceTitle)
</p>
<p>
<label class="label-ant">Announcement Remarks</label>
@Html.TextBoxFor(model => model.AnnounceRemarks, new {@class="k-textbox", @style="width:250px" })
@Html.ValidationMessageFor(model => model.AnnounceRemarks)
</p>
<p>
<label class="label-ant">Announce Link</label>
@Html.TextBoxFor(model => model.AnnounceLink, new {@class="k-textbox", @style="width:250px" })
@Html.ValidationMessageFor(model => model.AnnounceLink)
</p>
</div>
}
<script>
$("#submitSave").click(function () {
$("#Announcers").submit();
});
$("#submitDelete").click(function () {
$("#Announcers").attr({
"action" : "/Admin/DeleteAnnounce",
});
});
</script>
</div>
@使用(Html.BeginForm(“公告”,“管理”,FormMethod.Post,new{id=“Announcers”}))
{
@Html.AntiForgeryToken()
@Html.ValidationSummary(true)
拯救
删除
公告
@Html.HiddenFor(model=>model.AnnounceID)
公告标题
@Html.TextBoxFor(model=>model.propertiontitle,新的{@class=“k-textbox”,@style=“width:250px”})
@Html.ValidationMessageFor(model=>model.AnnounceTitle)
公告备注
@Html.TextBoxFor(model=>model.comments,新的{@class=“k-textbox”,@style=“width:250px”})
@Html.ValidationMessageFor(model=>model.announce备注)
公布链接
@Html.TextBoxFor(model=>model.AnnounceLink,新的{@class=“k-textbox”,@style=“width:250px”})
@Html.ValidationMessageFor(model=>model.AnnounceLink)
}
$(“#提交保存”)。单击(函数(){
$(“#播音员”).submit();
});
$(“#提交数据”)。单击(函数(){
美元(“#播音员”).attr({
“操作”:“/Admin/DeleteAnnounce”,
});
});
这是因为您使用的是First()。如果没有具有匹配标题的播音员,则抛出异常
请参见这是因为您使用的是First()。如果没有具有匹配标题的播音员,则抛出异常
请参见本系列中的了解差异所需的方法很少
在集合中,您需要了解差异的方法很少
TowerMonitor的底线:如果您的查询必须支持“不匹配”的情况,请使用
FirstOrDefault
。TowerMonitor的底线:如果您的查询必须支持“不匹配”的情况,请使用FirstOrDefault
。因为您的参数announce
为null
(您查看时从不为其回发任何值)因为您的参数annound
为null
(您查看时从不为其回发任何值)