[英](.net core MVC) Model is being returned null after form post but only when deployed to on premise IIS server
所以我遇到了這個非常奇怪的問題，我的 model 在提交表單后返回為 null。
現在我明白了 model 返回 null 本身並不一定很奇怪，但讓它非常奇怪的是它只發生在非常特殊的條件下：
我一輩子都弄不明白為什么會這樣，因為當我在本地運行時，一切正常。 但是，一旦我在本地服務器上部署並修改了頁面的日期過濾器，我就開始收到此錯誤。
這是我的觀點：
@model CoFCrimeBulletin.Models.ViewModels.CallsForServiceViewModel
@{
ViewData["Title"] = "Calls For Service";
Layout = "~/Views/Shared/_Layout.cshtml";
}
<div style="margin-left: 400px; width: 100%">
<ul class="nav nav-tabs">
<li class="nav-item">
<a class="nav-link text-dark" asp-area="" asp-controller="Home" asp-action="Index">Home</a>
</li>
<li class="nav-item">
<a class="nav-link text-dark" asp-area="" asp-controller="Home" asp-action="Arrests">Arrests</a>
</li>
<li class="nav-item">
<a class="nav-link text-dark" asp-area="" asp-controller="Home" asp-action="Warrants">Warrants</a>
</li>
<li class="nav-item">
<a class="nav-link text-dark" asp-area="" asp-controller="Home" asp-action="StreetChecks">Street Checks</a>
</li>
<li class="nav-item">
<a class="nav-link text-dark active" asp-area="" asp-controller="Home" asp-action="CallsForService">Calls For Service</a>
</li>
</ul>
</div>
<div class="container pt-5 CallsForService" >
<form asp-controller="Home" asp-action="CallsForService" method="post">
<div class=row>
<div class="pr-2">
<label><b>Search: </b></label>
<input type="text" id="WarrantsSearch" onkeyup="myWarrantsFunction()" placeholder="Search Calls for Service">
</div>
<div class="pr-2">
<label><b>Start Date: </b></label>
<input id="CallsForServiceStartDate" type="date" asp-for="@Model.StartDate" class="text-box single-line" value="@Model.StartDate.ToString("yyyy-MM-dd")" />
</div>
<div class="pr-2">
<label><b>End Date: </b></label>
<input id="CallsForServiceEndDate" type="date" asp-for="@Model.EndDate" class="text-box single-line" value="@Model.EndDate.ToString("yyyy-MM-dd")" />
</div>
<div>
<button type="submit" class="btn btn-secondary" onclick="VerifyDates()">Go</button>
</div>
</div>
</form>
<div class="row ">
<div class="col-sm-4 tableheading"><b>LOCAL CRIME</b></div>
</div>
<div class="row details">
<div class="col-sm" style="text-align:center"><b>Details</b></div>
</div>
<form asp-controller="Home" asp-action="CreatePDF" method="post">
<div id="LocalCrimeTable">
@{
for (int i = 0; i < Model.callsForService.Count; i++)
{
<div class="row suspectName">
<div class="col-sm-9">
<b>@Model.callsForService[i].type - @Model.callsForService[i].location</b>
<input asp-for="@Model.callsForService[i].location" style="display:none;" value="@Model.callsForService[i].location">
<input asp-for="@Model.callsForService[i].type" style="display:none;" value="@Model.callsForService[i].type">
</div>
<div class="col-sm-3" style="text-align:right">
<b>@Model.callsForService[i].datetime</b>
<input type="date" asp-for="@Model.callsForService[i].datetime" style="display:none;" value="@Model.callsForService[i].datetime.ToString("yyyy-MM-dd")">
</div>
</div>
<div class="row rmsNumber">
<div class="col-sm-4">
<b>@Model.callsForService[i].rmsnumdisplay</b>
<input asp-for="@Model.callsForService[i].rmsnumdisplay" style="display:none;" value="@Model.callsForService[i].rmsnumdisplay">
<input asp-for="@Model.callsForService[i].rmsnum" style="display:none;" value="@Model.callsForService[i].rmsnum">
</div>
<div class="col-sm-4">
<b>@Model.callsForService[i].zone</b>
<input asp-for="@Model.callsForService[i].zone" style="display:none;" value="@Model.callsForService[i].zone">
</div>
<div class="col-sm-4">
<b>COMPLAINTANT:</b> @Model.callsForService[i].caller
<input asp-for="@Model.callsForService[i].caller" style="display:none;" value="@Model.callsForService[i].caller">
</div>
</div>
<div class="row">
<div class="col-sm">
<b>REMARKS:</b> @Model.callsForService[i].remarks
<input asp-for="@Model.callsForService[i].remarks" style="display:none;" value="@Model.callsForService[i].remarks">
</div>
</div>
<div class="row">
<div class="col-sm">
<b>CLEAR REMARKS:</b> @Model.callsForService[i].clearremarks
<input asp-for="@Model.callsForService[i].clearremarks" style="display:none;" value="@Model.callsForService[i].clearremarks">
</div>
</div>
if(Model.IsWriter)
{
<div id="td">
<a href="#" class="btn btn-secondary additionalInfoEdit" data-target="#additionalInfoModal" data-toggle="modal" onclick="additionalInfoRender('@Model.callsForService[i].rmsnum', '@ViewData["Title"]', '@Model.StartDate.ToString()', '@Model.EndDate.ToString()')">+</a>
</div>
}
<div class="row">
<div class="col-12"> <b>ADDITIONAL NOTES:</b>
@if(Model.callsForService[i].additionalnotes != null && Model.callsForService[i].additionalnotes != ""){
<p class="truncateCrime">@Model.callsForService[i].additionalnotes</p>
<a class="expandNotesCrime underline text-green-500 button" href="#">Read more...</a>
<a class="shrinkNotesCrime underline text-green-500 button" href="#" style="display:none">Read less...</a>
}
<input asp-for="@Model.callsForService[i].additionalnotes" style="display:none;" value="@Model.callsForService[i].additionalnotes">
</div>
</div>
<div class="row" style="text-transform:capitalize">
<input asp-for="@Model.callsForService[i].createPDF" type="checkbox"> Check to Include in PDF
</div>
}
<input type="date" asp-for="@Model.StartDate" style="display:none;" value="@Model.StartDate.ToString("yyyy-MM-dd")">
<input type="date" asp-for="@Model.EndDate" style="display:none;" value="@Model.EndDate.ToString("yyyy-MM-dd")">
<input asp-for="@Model.SourcePage" style="display:none;" value="@Model.SourcePage">
}
</div>
@{
<input type="submit" class="btn btn-primary mt-5" value="Create PDF">
}
</form>
</div>
還有我的 Controller：
using CoFCrimeBulletin.Models;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Logging;
using System;
using System.IO;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.Extensions.Configuration;
using System.Security.Claims;
namespace CoFCrimeBulletin.Controllers
{
public class HomeController : Controller
{
private readonly ILogger<HomeController> _logger;
public IConfiguration _configuration;
public HomeController(ILogger<HomeController> logger, IConfiguration configuration)
{
_logger = logger;
_configuration = configuration;
}
private bool IsWriter()
{
bool localtest = false;
if (localtest) { return true; }
else
{
//ClaimsIdentity userIdentity = (ClaimsIdentity)User.Identity;
var UI = (ClaimsIdentity)User.Identity;
List<string> Groups = new List<string>();
if (UI.Claims.Where(c => c.Type == "groups").Count() > 0)
{
foreach (var group in UI.Claims.Where(c => c.Type == "groups"))
{
Groups.Add(group.Value);
}
}
return Groups.Contains("f615ae09-b313-444a-a41c-5dc2d586fc03");
}
}
public IActionResult Index(Models.ViewModels.BaseViewModel model)
{
Models.ViewModels.HomePageViewModel myModel = new Models.ViewModels.HomePageViewModel();
Repository.WarrantRepository warrantRepository = new Repository.WarrantRepository(_configuration);
Repository.ArrestRepository arrestRepository = new Repository.ArrestRepository(_configuration);
Repository.CrimeRepository crimeRepository = new Repository.CrimeRepository(_configuration);
DateTime startDate = model.StartDate;
DateTime endDate = model.EndDate;
myModel.warrants = warrantRepository.GetWarrants(startDate, endDate);
myModel.arrests = arrestRepository.GetArrests(startDate, endDate);
myModel.streetChecks = crimeRepository.GetStreetChecks(startDate, endDate);
myModel.callsForService = crimeRepository.GetCallsForService(startDate, endDate);
myModel.StartDate = startDate == DateTime.MinValue ? DateTime.Now.AddDays(-1) : startDate;
myModel.EndDate = endDate == DateTime.MinValue ? DateTime.Now : endDate;
myModel.IsWriter = IsWriter();
myModel.SourcePage = "Index";
return View(myModel);
}
public IActionResult Warrants(Models.ViewModels.BaseViewModel model)
{
DateTime startDate = model.StartDate;
DateTime endDate = model.EndDate;
Models.ViewModels.WarrantViewModel myModel = new Models.ViewModels.WarrantViewModel();
myModel.StartDate = startDate == DateTime.MinValue ? DateTime.Now.AddDays(-1) : startDate;
myModel.EndDate = endDate == DateTime.MinValue ? DateTime.Now : endDate;
Repository.WarrantRepository warrantRepository = new Repository.WarrantRepository(_configuration);
myModel.Warrants = warrantRepository.GetWarrants(startDate, endDate);
myModel.IsWriter = IsWriter();
myModel.SourcePage = "Warrants";
return View(myModel);
}
public IActionResult Arrests(Models.ViewModels.BaseViewModel model)
{
DateTime startDate = model.StartDate;
DateTime endDate = model.EndDate;
Models.ViewModels.ArrestViewModel myModel = new Models.ViewModels.ArrestViewModel();
myModel.StartDate = startDate == DateTime.MinValue ? DateTime.Now.AddDays(-1) : startDate;
myModel.EndDate = endDate == DateTime.MinValue ? DateTime.Now : endDate;
Repository.ArrestRepository arrestRepository = new Repository.ArrestRepository(_configuration);
myModel.arrests = arrestRepository.GetArrests(startDate, endDate);
myModel.IsWriter = IsWriter();
myModel.SourcePage = "Arrests";
return View(myModel);
}
public IActionResult StreetChecks(Models.ViewModels.BaseViewModel model)
{
DateTime startDate = model.StartDate;
DateTime endDate = model.EndDate;
Models.ViewModels.StreetChecksViewModel myModel = new Models.ViewModels.StreetChecksViewModel();
myModel.StartDate = startDate == DateTime.MinValue ? DateTime.Now.AddDays(-1) : startDate;
myModel.EndDate = endDate == DateTime.MinValue ? DateTime.Now : endDate;
Repository.CrimeRepository crimeRepository = new Repository.CrimeRepository(_configuration);
myModel.streetChecks = crimeRepository.GetStreetChecks(startDate, endDate);
myModel.IsWriter = IsWriter();
myModel.SourcePage = "StreetChecks";
return View(myModel);
}
public IActionResult CallsForService(Models.ViewModels.BaseViewModel model)
{
DateTime startDate = model.StartDate;
DateTime endDate = model.EndDate;
Models.ViewModels.CallsForServiceViewModel myModel = new Models.ViewModels.CallsForServiceViewModel();
myModel.StartDate = startDate == DateTime.MinValue ? DateTime.Now.AddDays(-1) : startDate;
myModel.EndDate = endDate == DateTime.MinValue ? DateTime.Now : endDate;
Repository.CrimeRepository crimeRepository = new Repository.CrimeRepository(_configuration);
myModel.callsForService = crimeRepository.GetCallsForService(startDate, endDate);
myModel.IsWriter = IsWriter();
myModel.SourcePage = "CallsForService";
return View(myModel);
}
public IActionResult AddAdditionalNote(Models.ViewModels.AdditionalInfoViewModel model)
{
try
{
Repository.AdditionalNotesRepository additionalNotesRepository = new Repository.AdditionalNotesRepository(_configuration);
string redirectAction = Helpers.AdditionalInfoHelper.GetRedirectActionName(model.sourcePage);
Models.ViewModels.BaseViewModel myModel = new Models.ViewModels.BaseViewModel();
string rmsNum = model.rmsNum.Replace("-", string.Empty);
string remarks = model.additionalNotes == null? "" : model.additionalNotes;
myModel.StartDate = model.StartDate;
myModel.EndDate = model.EndDate;
additionalNotesRepository.InsertAdditionalNotes(rmsNum, remarks);
return RedirectToAction(redirectAction, myModel);
}
catch(Exception ex)
{
Console.WriteLine(ex.Message);
}
return Redirect(HttpContext.Request.Headers["Referer"]);
}
public PartialViewResult RenderAdditionalInfoModal(string RmsNum, DateTime StartDate, DateTime EndDate, string SourcePage)
{
string rms = RmsNum.Replace("-", string.Empty);
Repository.AdditionalNotesRepository additionalNotesRepository = new Repository.AdditionalNotesRepository(_configuration);
Models.ViewModels.AdditionalInfoViewModel myModel = new Models.ViewModels.AdditionalInfoViewModel();
myModel.rmsNum = RmsNum;
myModel.StartDate = StartDate;
myModel.EndDate = EndDate;
myModel.sourcePage = SourcePage;
myModel.additionalNotes = additionalNotesRepository.GetAdditionalNote(rms);
return PartialView("_AdditionalInfoPartial", myModel);
}
[HttpPost]
public IActionResult CreatePDF(Models.ViewModels.HomePageViewModel model)
{
try
{
Models.ViewModels.BaseViewModel myModel = new Models.ViewModels.BaseViewModel();
Models.PdfCreation pdf = new Models.PdfCreation();
string redirectAction = model.SourcePage;
redirectAction = Helpers.AdditionalInfoHelper.GetRedirectActionName(model.SourcePage);
myModel.StartDate = model.StartDate;
myModel.EndDate = model.EndDate;
pdf.arrests = Helpers.PdfHelper.GetArrestsForPdfCreation(model.arrests);
pdf.warrants = Helpers.PdfHelper.GetWarrantsForPdfCreation(model.warrants);
pdf.callsForService = Helpers.PdfHelper.GetCallsForServiceForPdfCreation(model.callsForService);
pdf.streetChecks = Helpers.PdfHelper.GetStreetChecksForPdfCreation(model.streetChecks);
Helpers.PdfHelper.CreatePdf(pdf);
return RedirectToAction(redirectAction, myModel);
}
catch (Exception ex)
{
using (StreamWriter writer = new StreamWriter(@"C:\CrimeBulletin PDFs\out.txt", true))
{
Console.SetOut(writer);
Console.WriteLine(ex.Message);
Console.WriteLine(ex.StackTrace);
}
return Redirect(HttpContext.Request.Headers["Referer"]);
}
}
[ResponseCache(Duration = 0, Location = ResponseCacheLocation.None, NoStore = true)]
public IActionResult Error()
{
return View(new ErrorViewModel { RequestId = Activity.Current?.Id ?? HttpContext.TraceIdentifier });
}
public IActionResult Privacy()
{
return View();
}
}
}
和型號：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
namespace CoFCrimeBulletin.Models.ViewModels
{
public class HomePageViewModel : BaseViewModel
{
public List<Arrest> arrests { get; set; }
public List<Warrant> warrants { get; set; }
public List<Crime> callsForService { get; set; }
public List<Crime> streetChecks { get; set; }
public HomePageViewModel()
{
arrests = new List<Arrest>();
warrants = new List<Warrant>();
callsForService = new List<Crime>();
streetChecks = new List<Crime>();
}
}
}
using System;
using System.Collections.Generic;
using System.Text;
namespace CoFCrimeBulletin.Models.ViewModels
{
public class CallsForServiceViewModel : BaseViewModel
{
public List<Crime> callsForService { get; set; }
public CallsForServiceViewModel()
{
callsForService = new List<Crime>();
}
}
}
當我提交表單時，顯示 model 的屏幕截圖是 null：
如果我不修改日期過濾器，屏幕截圖顯示 model 實際上正在填充：
重要的是要注意，這兩個屏幕截圖都顯示了提交相同表單的結果。 還要指出的是，這些屏幕截圖是從服務器上的遠程調試中獲取的。 不是來自我的本地機器。
同樣重要的是要注意，當我在我的本地機器上運行它時，我可以提交任何我想要的方式，包括在修改日期過濾器之后，我永遠不會得到 null model 回來。 當應用程序部署到我的本地 IIS 服務器時，我只能復制此錯誤。
我找不到與我遇到的問題相匹配的任何其他帖子。 任何幫助都將不勝感激。
由於我將屏幕上顯示的所有數據回發到我的 controller，然后從那里進行排序，問題可能是當太多數據被發布到 controller model 時，model 是 null 嗎？ 目前正在調查此事。
好的，我發現並解決了問題。 它與部署到內部部署的 IIS 服務器無關，也與我正在更改日期范圍以及與我回發到 controller 的數據集大小有關。
由於我將所有數據發回我的 controller，然后根據復選框值進行排序，發回我的 controller 的數據量超過了 asp.net 核心 MVC 設置的默認限制。
現在人們可能會猜到，我在本地使用的數據集足夠小，不會超過限制。 此外，增加我的過濾器的日期范圍會產生使數據集更大的次要效果。
解決方案：
我很難識別此錯誤的原因是因為我只收到 nullReference 錯誤，而沒有收到“InvalidDataException：超出表單值計數限制 1024”。
其中，一旦我確定問題將我帶到這個線程，它告訴我你可以用這段代碼覆蓋默認限制：
services.Configure<FormOptions>(options =>
{
options.ValueCountLimit = int.MaxValue;
});
在 Startup.cs 的 ConfigureServices 方法中
我添加了那段代碼，問題就消失了。 model 現在可以正確綁定大量數據。
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