问题描述
如果我提交页面，第一次保存没有问题
然后我将所有值分配给我想写入的另一个实体以在那里创建新记录。
为什么我会得到一个 System Null Reference。我在所有领域都有我想要的值？
[
=== 这是我的 C# 代码 ============
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.RazorPages;
using Microsoft.AspNetCore.Mvc.Rendering;
using Microsoft.EntityFrameworkCore;
using WorkCollaboration.Data;
using WorkCollaboration.Models;
namespace WorkCollaboration.Pages.TimeReports
{
public class CreateModel : PageModel
{
private readonly WorkCollaboration.Data.WorkCollaborationContext _context;
public CreateModel(WorkCollaboration.Data.WorkCollaborationContext context)
{
_context = context;
}
public IActionResult OnGet()
{
CusContactDropDownDisp = _context.CusContactDropDown.ToList(); // Added for DropDown
SupContactDropDownDisp = _context.SupContactDropDown.ToList(); // Added for DropDown
return Page();
}
[BindProperty]
public TimeReport TimeReport { get; set; }
public IEnumerable<Models.CusContactDropDown> CusContactDropDownDisp { get; set; }
public IEnumerable<Models.SupContactDropDown> SupContactDropDownDisp { get; set; }
public Models.PointsforSupContact PointsforSupContact { get; set; }
// To protect from overposting attacks,enable the specific properties you want to bind to,for
// more details,see https://aka.ms/RazorPagesCRUD.
public async Task<IActionResult> OnPostAsync()
{
if (!ModelState.IsValid)
{
return Page();
}
TimeReport.TimeReportSupContactPointValue = (TimeReport.TimeReportHours * 10);
_context.TimeReport.Add(TimeReport);
await _context.SaveChangesAsync();
//============================================
// Adding new Point Record to Supplier Contact
//============================================
PointsforSupContact.PointsId = TimeReport.TimeReportId;
PointsforSupContact.PointsSupContactId = TimeReport.TimeReportSupplierTalentContactId;
PointsforSupContact.PointsInternalUserId = 1; // User 1 Christof Oberholzer must be entered in Contacts and User
PointsforSupContact.PointsDate = TimeReport.TimeReportDate;
PointsforSupContact.PointsTotal = TimeReport.TimeReportSupContactPointValue;
PointsforSupContact.PointsText = TimeReport.TimeReportText;
PointsforSupContact.PointsTitle = "TimeReporting Points";
_context.PointsforSupContact.Add(PointsforSupContact);
await _context.SaveChangesAsync();
return RedirectToPage("/TimeReportOverview/Index");
}
}
}
==== 我的主页 ======
@page
@using Microsoft.AspNetCore.Localization
@using Microsoft.AspNetCore.Mvc.Localization
@model WorkCollaboration.Pages.TimeReports.CreateModel
@{
ViewData["Title"] = "Create";
ViewData["RandomId"] = Guid.NewGuid().GetHashCode();
}
@inject IViewLocalizer Localizer
<h1>Create</h1>
<h4>TimeReport</h4>
<p>
<a asp-page="/TimeReportOverview/Index">Back to Index</a>
</p>
<hr />
<div class="row">
<div class="col-md-4">
<form method="post">
<div asp-validation-summary="ModelOnly" class="text-danger"></div>
<input type="hidden" asp-for="TimeReport.TimeReportSupContactPointValue" value="0"/>
<div class="form-group">
<label asp-for="TimeReport.TimeReportId" class="control-label"></label>
<input asp-for="TimeReport.TimeReportId" value='@ViewData["RandomId"]' readonly="readonly" class="form-control" />
<span asp-validation-for="TimeReport.TimeReportId" class="text-danger"></span>
</div>
<div class="form-group">
<label asp-for="TimeReport.TimeReportCustomerNeedContactId" class="control-label"></label>
</div>
<select id="CusContactId" asp-for="CusContactDropDownDisp" asp-items="@(new SelectList(Model.CusContactDropDownDisp,"CusContactId","CusFullName"))">
<option value="" selected disabled>--Choose Customer--</option>
</select>
<div class="form-group">
<input asp-for="TimeReport.TimeReportCustomerNeedContactId" readonly="readonly" class="form-control" />
<span asp-validation-for="TimeReport.TimeReportCustomerNeedContactId" class="text-danger"></span>
</div>
<div class="form-group">
<label asp-for="TimeReport.TimeReportSupplierTalentContactId" class="control-label"></label>
</div>
<select id="SupContactId" asp-for="SupContactDropDownDisp" asp-items="@(new SelectList(Model.SupContactDropDownDisp,"SupContactId","SupFullName"))">
<option value="" selected disabled>--Choose Supplier--</option>
</select>
<div class="form-group">
<input asp-for="TimeReport.TimeReportSupplierTalentContactId" readonly="readonly" class="form-control" />
<span asp-validation-for="TimeReport.TimeReportSupplierTalentContactId" class="text-danger"></span>
</div>
<div class="form-group">
<label asp-for="TimeReport.TimeReportDate" class="control-label"></label>
<input type="datetime-local" asp-for="TimeReport.TimeReportDate" class="form-control" />
<span asp-validation-for="TimeReport.TimeReportDate" class="text-danger"></span>
</div>
<div class="form-group">
<label asp-for="TimeReport.TimeReportHours" class="control-label"></label>
<input asp-for="TimeReport.TimeReportHours" class="form-control" />
<span asp-validation-for="TimeReport.TimeReportHours" class="text-danger"></span>
</div>
<div class="form-group">
<label asp-for="TimeReport.TimeReportText" class="control-label"></label>
<input asp-for="TimeReport.TimeReportText" class="form-control" />
<span asp-validation-for="TimeReport.TimeReportText" class="text-danger"></span>
</div>
<div class="form-group">
@Html.LabelFor(model => model.TimeReport.TimeReportState,htmlAttributes: new { @class = "form-group" })
<div class="form-group">
@Html.DropDownListFor(model => model.TimeReport.TimeReportState,new List<SelectListItem>
{
new SelectListItem {Text = "Gebucht",Value = "Reported",Selected = true },new SelectListItem {Text = "Kontrolliert",Value = "Controlled" },new SelectListItem {Text = "Verrechnet / Noch nicht bezahlt",Value = "Invoiced / Not yet payed" },new SelectListItem {Text = "Verrechnet / Bezahlt",Value = "Invoiced / Payed" },},new { @class = "form-control" })
@Html.ValidationMessageFor(model => model.TimeReport.TimeReportState,"",new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
<input type="submit" value="Create" class="btn btn-primary" />
<a href="/TimeReportOverview/Index" class="btn btn-primary">Back to List</a>
</div>
</form>
</div>
</div>
<script src="~/lib/jquery/dist/jquery.min.js"></script>
<script src="~/lib/jquery-validation/dist/jquery.validate.min.js"></script>
<script src="~/lib/jquery-validation-unobtrusive/jquery.validate.unobtrusive.min.js"></script>
<script>
$("#CusContactId").on("change",function () {
$("#TimeReport_TimeReportCustomerNeedContactId").val($("#CusContactId").val());
});
$("#SupContactId").on("change",function () {
$("#TimeReport_TimeReportSupplierTalentContactId").val($("#SupContactId").val());
});
</script>
@section Scripts {
@{await Html.RenderPartialAsync("_ValidationScriptsPartial");}
}
感谢您的帮助
解决方法
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