我正在努力在MVC 5中插入多个记录。我一直在使用本教程作为开头：http://dotnetawesome.com/mvc/insert-multiple-record-to-database-at-a-time-aspnet-mvc4，但我的情况有点不同。
我从现有表中提取数据，然后添加4列数据。现有表中的数据和新的4列数据都将添加到新表中。我不需要如上面教程中所示的“添加新行”。
我已经完成了所有设置，但在我的帖子中，我的模型又回来了，我不知道为什么。
// GET:
public ActionResult PCP2(string sortOrder, string currentFilter, string searchString, int? page, string pcp, string location, string locationToSchedule, string scheduleVisitType, string approvedBy)
{
ViewBag.Location = location;
ViewBag.LocationType = locationToSchedule;
ViewBag.VisitType = scheduleVisitType;
ViewBag.ApprovedBy = approvedBy;
//query db
var model = from n in db.DataDump
where n.PCP == pcp
orderby n.MemberName
select new SnapshotVM()
{
SubscriberID = n.SubscriberID,
MemberName = n.MemberName,
DateOfBirth = n.DateOfBirth,
PCP = n.PCP,
IPA = n.IPA,
App = n.App,
RemainingOpportunities = n.RemainingOpportunities,
TID = 0,
Location = "",
ApprovedBy = "",
LocationToSchedule = "",
ScheduleVisitType = "",
Guid = Guid.NewGuid(),
ParentCompany = "XXX",
location = location,
locationToSchedule = locationToSchedule,
scheduleVisitType = scheduleVisitType,
approvedBy = approvedBy
};
return View(model.ToList());
}
// POST:
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult PCP(List<SnapshotVM> model)
{
var addMember = newTD();
// save data
using (var context = new TDAllDb())
foreach (var item in model)
{
//Add Member
addMember.SubscriberID = item.SubscriberID;
addMember.MemberName = item.MemberName;
addMember.DateOfBirth = item.DateOfBirth;
addMember.PCP = item.PCP;
addMember.IPA = item.IPA;
addMember.App = item.App;
addMember.RemainingOpportunities = item.RemainingOpportunities;
addMember.Location = item.Location;
addMember.ApprovedBy = item.ApprovedBy;
addMember.LocationToSchedule = item.LocationToSchedule;
addMember.ScheduleVisitType = item.ScheduleVisitType;
addMember.Guid = Guid.NewGuid();
addMember.DateCreated = System.DateTime.Now.AddHours(-7);
addMember.ParentCompany = "XXX";
context.TD.Add(addMember);
context.SaveChanges();
}
return View(model);
}
查看：
<table>
@if (Model != null && Model.Count > 0)
{
int j= 0;
foreach (var item in Model)
{
j = j + 1;
<tr>
<td>@j</td>
<td>
@item.SubscriberID
</td>
<td>
@item.MemberName
</td>
<td>
@if (item.DateOfBirth != null)
{
@item.DateOfBirth.Value.ToShortDateString()
}
</td>
<td>
@item.IPA
</td>
<td>
@item.App
</td>
<td>
@Html.DropDownList("[" + @j + "].Location", (IEnumerable<SelectListItem>)ViewBag.location, "", new { @class = "input-sm" })
@Html.Hidden("[" + @j + "].SubscriberID", item.SubscriberID)
@Html.Hidden("[" + @j + "].MemberName", item.MemberName)
@Html.Hidden("[" + @j + "].DateOfBirth", item.DateOfBirth)
@Html.Hidden("[" + @j + "].PCP", item.PCP)
@Html.Hidden("[" + @j + "].IPA", item.IPA)
@Html.Hidden("[" + @j + "].App", item.App)
@Html.Hidden("[" + @j + "].RemainingOpportunities", item.RemainingOpportunities)
<td>
@Html.DropDownList("[" + @j + "].LocationToSchedule", new List<SelectListItem>
{
new SelectListItem {Text = "Home", Value = "Home"},
new SelectListItem {Text = "Office", Value = "Office"},
},
"",
new { @class = "form-control" })
</td>
<td>
@Html.DropDownList("[" + @j + "].ScheduleVisitType", new List<SelectListItem>
{
new SelectListItem {Text = "Screening", Value = "Screening"},
new SelectListItem {Text = "Hold", Value = "Hold"},
},
"",
new { @class = "form-control" })
</td>
<td>
@Html.DropDownList("[" + @j + "].ApprovedBy", new List<SelectListItem>
{
new SelectListItem {Text = "XXX", Value = "XXX"},
new SelectListItem {Text = "YYY", Value = "YYY"},
},
"",
new { @class = "form-control" })
</td>
<td></td>
</td>
</tr>
}
}
</table>
<input type="submit" value="Save Changes" class="btn btn-success" />
视图模型
public class SnapshotVM
{
[Key]
[Required]
[StringLength(255)]
[DisplayName("Subscriber ID")]
public string SubscriberID { get; set; }
[StringLength(255)]
public string IPA { get; set; }
[StringLength(255)]
[DisplayName("Member Name")]
public string MemberName { get; set; }
[DisplayName("DOB")]
public DateTime? DateOfBirth { get; set; }
[StringLength(255)]
public string App { get; set; }
[DisplayName("Rem. Opp.")]
public int? RemainingOpportunities { get; set; }
[StringLength(255)]
public string PCP { get; set; }
[Key]
public int? TID { get; set; }
[Required]
[StringLength(50)]
[DisplayName("*Location")]
public string Location { get; set; }
[DisplayName("Parent Company")]
public string ParentCompany { get; set; }
[StringLength(255)]
[DisplayName("Approved By")]
public string ApprovedBy { get; set; }
[DatabaseGenerated(DatabaseGeneratedOption.None)]
public Guid? Guid { get; set; }
[StringLength(25)]
[DisplayName("Type of Visit to Schedule")]
public string ScheduleVisitType { get; set; }
[StringLength(15)]
[DisplayName("Location to Schedule")]
public string LocationToSchedule { get; set; }
public DateTime? DateCreated { get; set; }
public IEnumerable<SelectListItem> PCPList { get; set; }
public string location { get; set; }
public string locationToSchedule { get; set; }
public string scheduleVisitType { get; set; }
public string approvedBy { get; set; }
}
我收到的错误是：
{"Object reference not set to an instance of an object."}
在模特的“发布”中......
foreach (var item in model)
我错过了什么？
TIA！
修改
我将我的字段更新为HiddenFor和DropDownListFor（例如：@ Html.HiddenFor（m =＆gt; item.SubscriberID）），我收到一个新错误：
System.StackOverflowException was unhandled
Message: An unhandled exception of type 'System.StackOverflowException' occurred in System.Web.dll
Make sure you don't have an infinite loop or recursion.
当我在下拉菜单中选择选项时，“获取”会出现此错误。我在源代码中注意到这些字段没有使用计数进行索引。
@if (Model != null && Model.Count > 0)
{
int j= 0;
foreach (var item in Model)
{
@Html.DropDownListFor(m => item.Location, (IEnumerable<SelectListItem>)ViewBag.location, "", new { @class = "input-sm" })
@Html.HiddenFor(m => item.SubscriberID)
@Html.HiddenFor(m => item.MemberName)
@Html.HiddenFor(m => item.DateOfBirth)
@Html.HiddenFor(m => item.PCP)
@Html.HiddenFor(m => item.IPA)
@Html.HiddenFor(m => item.App)
@Html.HiddenFor(m => item.RemainingOpportunities)
产生这个，名称/ ID上没有索引：
<input id="item_SubscriberID" name="item.SubscriberID" type="hidden" value="123456" />
<input id="item_MemberName" name="item.MemberName" type="hidden" value="FULL NAME" />
<input id="item_DateOfBirth" name="item.DateOfBirth" type="hidden" value="1/15/1900" />
<input id="item_PCP" name="item.PCP" type="hidden" value="NAME" />
<input id="item_IPA" name="item.IPA" type="hidden" value="Y" />
<input id="item_App" name="item.App" type="hidden" value="XXX" />
<input id="item_RemainingOpportunities" name="item.RemainingOpportunities" type="hidden" value="0" />
没有索引似乎不正确。我错过了什么？我已经做了几个小时的工作了，我开始对此有所了解。
答案 0 :(得分：0)
您在for循环中将j值增加到j = j + 1;，并由于生成了哪个名称为＆＃34; [1] .SubscriberID＆＃34;，＆＃34; [2] .SubscriberID＆＃34 ;.因为，模型集合在后期操作中从第0个索引绑定，因此在您的情况下模型将被接收为null。
另一点 - 您可以使用HiddenFor和DropDownListFor扩展，它们会自动生成输入控件的相应Id和name属性。这不需要硬编码的索引名称[" + @j + "]。