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POMVC3 - passing null item when model requires TimeSpan
 

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    <p>Well I've recently come up against an interesting problem that I can't seem to figure out.</p> <p>The error message I get is:</p> <pre><code>{"The model item passed into the dictionary is null, but this dictionary requires a non-null model item of type 'System.TimeSpan'."} </code></pre> <p>This occurs when I try to submit a new entry to the database. So, the details of what is being submitted.</p> <p>The model class:</p> <pre><code>public class EventModel { [Key] public int EventID { get; set; } [DisplayName("Booking title")] [Required(ErrorMessage="Please provide a title for the booking")] public string Title { get; set; } [DataType(DataType.Date)] [DisplayName("Start date")] [DisplayFormat(DataFormatString="{0:dd/MM/yyyy}", ApplyFormatInEditMode = true)] public DateTime StartDateTime { get; set; } [DisplayName("End date")] [DataType(DataType.Date)] [DisplayFormat(DataFormatString = "{0:dd/MM/yyyy}", ApplyFormatInEditMode = true)] [IsDateAfter("StartDateTime", true, ErrorMessage="End date must be on or after the start date")] public DateTime EndDateTime { get; set; } public long StartTicks { get; set; } public long EndTicks { get; set; } [NotMapped] [DisplayName("Start Time")] public TimeSpan StartTime { get { return TimeSpan.FromTicks(StartTicks); } set { StartTicks = value.Ticks; } } [NotMapped] [DisplayName("End Time")] public TimeSpan EndTime { get { return TimeSpan.FromTicks(EndTicks); } set { EndTicks = value.Ticks; } } [DefaultValue(2)] [DisplayName("Booking is")] public int BookingStatus { get; set; } [DisplayName("Set recurrence")] [DefaultValue(false)] public bool DoesRecur { get; set; } [DisplayName("Set recurrence type")] public string Pattern { get; set; } [DisplayName("Set the day this happens on ")] public int DayIndex { get; set; } [DisplayName("Choose the day instance this recurs on")] public int DayCount { get; set; } [DisplayName("Day ")] [NotMapped] public string Day { get; set; } [DisplayName("Instance")] [NotMapped] public string Instance { get; set; } // links resource to a user/member [DisplayName("Booked by")] [NotMapped] public string BookerName { get; set; } public Guid MemberID { get; set; } // links resource to a resource type [DisplayName("Resource required:")] public int ResourceID { get; set; } } </code></pre> <p>The action methods in the controller class:</p> <pre><code>[HttpGet] public ActionResult Create(DateTime eventDate) { var days = from DayOfWeek d in Enum.GetValues(typeof(DayOfWeek)) select new { ID = (int) d, Name = (DayOfWeek)d }; var instance = from DayInstance i in Enum.GetValues(typeof(DayInstance)) select new { ID = (int) i, Name = (DayInstance)i }; MembershipUser mu = Membership.GetUser(HttpContext.Profile.UserName); CreateEventViewModel model = new CreateEventViewModel() { Event = new EventModel() { StartDateTime = eventDate, EndDateTime = eventDate, MemberID = (Guid)mu.ProviderUserKey }, Resources = DBContext.Resources.ToList(), Patterns = DBContext.Patterns.ToList(), ResourceTypes = DBContext.ResourceTypes.ToList() }; ViewData["dayOfWeek"] = new SelectList(days, "ID", "Name", DayOfWeek.Monday); ViewData["dayInstance"] = new SelectList(instance, "ID", "Name", DayInstance.First); return View(model); } [HttpPost] public ActionResult Create(CreateEventViewModel em) { if (ModelState.IsValid) { // get the resource turn aournd time double turnAround = rc.GetResourceTurnAround(em.Event.ResourceID); MembershipUser mu = Membership.GetUser(HttpContext.Profile.UserName); em.Event.MemberID = (Guid) mu.ProviderUserKey; em.Event.BookingStatus = 2; // need to get the time added to the date. DateTime actualStartPoint = new DateTime(em.Event.StartDateTime.Ticks + em.Event.StartTicks); DateTime actualEndPoint = new DateTime(em.Event.EndDateTime.Ticks + em.Event.EndTicks); em.Event.StartDateTime = actualStartPoint; em.Event.EndDateTime = actualEndPoint; // add turn around time to the end of the event em.Event.EndDateTime = em.Event.EndDateTime.AddMinutes(turnAround); // needed becase these are handled slighty differently to the rest of the model em.Event.DayIndex = int.Parse(Request.Form.GetValues("dayOfWeek").GetValue(0).ToString()); em.Event.DayCount = int.Parse(Request.Form.GetValues("dayInstance").GetValue(0).ToString()); DBContext.Events.Add(em.Event); DBContext.SaveChanges(); // get the resource owner MembershipUser resourceOwner = Membership.GetUser(rc.GetResourceOwnerByID(em.Event.ResourceID)); // email the admin team and the user the details of this booking // get the email address of the user making the booking StringBuilder message = new StringBuilder(); message.AppendFormat("Thank you for your booking, this is now being reviewed by the team.\nThe details of your booking are included for confirmation.\n"); message.AppendFormat("Booking Title: {0}\nResource: {1}\n Date: {2} {3} (this includes our turn around time added on)\n", em.Event.Title, rc.GetResourceNameByID(em.Event.ResourceID), actualStartPoint, actualEndPoint); message.AppendFormat("You can log in at any time to review your bookings.\nYou will receive an email when the team have reviewed this request\nMany thanks\n"); EmailHandler eh = new EmailHandler(); eh.SetRecipient(Membership.GetUser().Email); eh.AddAdminEmail(); eh.AddBcc(resourceOwner.Email); eh.SetSubject("Booking Requested"); eh.SetBody(message.ToString()); eh.sendMessage(); return RedirectToAction("Index"); } else { return View(); } } </code></pre> <p>Now for the view items - the main view:</p> <pre><code>@model AssetManager.Models.CreateEventViewModel @{ ViewBag.Title = "Create"; Layout = "~/Views/Shared/_Layout.cshtml"; } @using (Html.BeginForm()) { @Html.ValidationSummary(true) &lt;fieldset&gt; &lt;legend id="bookingLegend"&gt;Place Booking&lt;/legend&gt; &lt;div class="controlcontainer"&gt; &lt;div class="editor-label"&gt; @Html.LabelFor(model =&gt; model.Event.Title) &lt;/div&gt; &lt;div class="editor-field"&gt; @Html.EditorFor(model =&gt; model.Event.Title) @Html.ValidationMessageFor(model =&gt; model.Event.Title) &lt;/div&gt; &lt;/div&gt; &lt;div class="controlcontainer"&gt; &lt;div class="editor-label"&gt; @Html.LabelFor(model =&gt; model.Event.StartDateTime) &lt;/div&gt; &lt;div class="editor-field"&gt; @Html.EditorFor(model =&gt; model.Event.StartDateTime, new { @class = "date" }) @Html.ValidationMessageFor(model =&gt; model.Event.StartDateTime) &lt;/div&gt; &lt;/div&gt; &lt;div class="controlcontainer"&gt; &lt;div class="editor-label timeSelector"&gt; @Html.LabelFor(model =&gt; model.Event.StartTime) &lt;/div&gt; &lt;div class="editor-field timeSelector"&gt; @Html.EditorFor(model =&gt; model.Event.StartTime) @Html.ValidationMessageFor(model =&gt; model.Event.StartTime) &lt;/div&gt; &lt;/div&gt; &lt;div class="controlcontainer"&gt; &lt;div class="editor-label"&gt; @Html.LabelFor(model =&gt; model.Event.EndDateTime) &lt;/div&gt; &lt;div class="editor-field"&gt; @Html.EditorFor(model =&gt; model.Event.EndDateTime, new { @class = "date" }) @Html.ValidationMessageFor(model =&gt; model.Event.EndDateTime) &lt;/div&gt; &lt;/div&gt; &lt;div class="controlcontainer"&gt; &lt;div class="editor-label timeSelector"&gt; @Html.LabelFor(model =&gt; model.Event.EndTime) &lt;/div&gt; &lt;div class="editor-field timeSelector"&gt; @Html.EditorFor(model =&gt; model.Event.EndTime) @Html.ValidationMessageFor(model =&gt; model.Event.EndTime) &lt;/div&gt; &lt;/div&gt; &lt;div class="controlcontainer"&gt; &lt;div class="editor-label"&gt; @Html.Label("Select Resource Type") &lt;/div&gt; &lt;div class="editor-field"&gt; @Html.DropDownList("ResourceTypes", new SelectList(Model.ResourceTypes, "ResourceTypeID", "Title"), "-- Select Resource Type --", new { @id = "ddlResourceTypes" }) &lt;/div&gt; &lt;/div&gt; &lt;div class="controlcontainer"&gt; &lt;div class="editor-label"&gt; @Html.LabelFor(model =&gt; model.Event.ResourceID) &lt;/div&gt; &lt;div class="editor-field"&gt; @Html.DropDownListFor(model =&gt; model.Event.ResourceID, new SelectList(Enumerable.Empty&lt;SelectListItem&gt;(), "ResourceType", "Name"), "-- Select Resource --", new { @id = "ddlResources" }) @Html.ValidationMessageFor(model =&gt; model.Event.ResourceID) &lt;/div&gt; &lt;/div&gt; &lt;div class="controlcontainer"&gt; &lt;div class="editor-label"&gt; @Html.LabelFor(model =&gt; model.Event.DoesRecur) &lt;/div&gt; &lt;div class="editor-field"&gt; @Html.EditorFor(model =&gt; model.Event.DoesRecur) @Html.ValidationMessageFor(model =&gt; model.Event.DoesRecur) &lt;/div&gt; &lt;/div&gt; &lt;div id="recurType" class="controlcontainer"&gt; &lt;div class="editor-label"&gt; @Html.LabelFor(model =&gt; model.Event.Pattern) &lt;/div&gt; &lt;div class="editor-field"&gt; @Html.DropDownListFor(model =&gt; model.Event.Pattern, new SelectList(Model.Patterns, "PatternCode", "Pattern"), "-- Select Recurrence Pattern --") @Html.ValidationMessageFor(model =&gt; model.Event.Pattern) &lt;/div&gt; &lt;/div&gt; &lt;div id="recurDayHappens" class="controlcontainer"&gt; &lt;div class="editor-label"&gt; @Html.LabelFor(model =&gt; model.Event.DayIndex) &lt;/div&gt; &lt;div class="editor-field"&gt; @Html.DropDownList("dayOfWeek") @Html.ValidationMessageFor(model =&gt; model.Event.DayIndex) &lt;/div&gt; &lt;/div&gt; &lt;div id="recurInstance" class="controlcontainer"&gt; &lt;div class="editor-label"&gt; @Html.LabelFor(model =&gt; model.Event.DayCount) &lt;/div&gt; &lt;div class="editor-field"&gt; @Html.DropDownList("dayInstance") @Html.ValidationMessageFor(model =&gt; model.Event.DayCount) &lt;/div&gt; &lt;/div&gt; &lt;div class="controlcontainer"&gt; &lt;p&gt; &lt;input class="subButton" type="submit" value="Create" /&gt; &lt;input id="cancelBtn" class="cancelButton" type="button" value="Cancel" onclick="location.href='@Url.Action("Index", "Calendar")'" /&gt; &lt;/p&gt; &lt;/div&gt; &lt;/fieldset&gt; } </code></pre> <p>Then there is an editor template for the TimeSpan items:</p> <pre><code>@model TimeSpan @Html.DropDownList("Hours", Enumerable.Range(0, 24) .Select(i =&gt; new SelectListItem { Value = i.ToString(), Text = i.ToString(), Selected = Model.Hours == i }))&amp;nbsp;: @Html.DropDownList("Minutes", Enumerable.Range(0, 60) .Select(i =&gt; new SelectListItem { Value = i.ToString(), Text = i.ToString(), Selected = Model.Minutes == i })) </code></pre> <p>And finally a TimeBinder class:</p> <pre><code>public class TimeBinder : IModelBinder { public object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext) { // Ensure there's incomming data var key_hours = bindingContext.ModelName + ".Hours"; var valueProviderResult_hours = bindingContext.ValueProvider .GetValue(key_hours); var key_minutes = bindingContext.ModelName + ".Minutes"; var valueProviderResult_minutes = bindingContext.ValueProvider .GetValue(key_minutes); if (valueProviderResult_hours == null || string.IsNullOrEmpty(valueProviderResult_hours.AttemptedValue) || valueProviderResult_minutes == null || string.IsNullOrEmpty(valueProviderResult_minutes.AttemptedValue)) { return null; } // Preserve it in case we need to redisplay the form bindingContext.ModelState.SetModelValue(key_hours, valueProviderResult_hours); bindingContext.ModelState.SetModelValue(key_minutes, valueProviderResult_minutes); // Parse var hours = ((string[])valueProviderResult_hours.RawValue)[0]; var minutes = ((string[])valueProviderResult_minutes.RawValue)[0]; // A TimeSpan represents the time elapsed since midnight var time = new TimeSpan(Convert.ToInt32(hours), Convert.ToInt32(minutes), 0); return time; } } </code></pre> <p>That's it, that is all the code that is involved. I am completely baffled as to why this error occurs. Any ideas or suggestions as to the cause and the solution are greatly appreciated.</p> <p>Many thanks nathj07</p> <p><strong>EDIT</strong> Pk, so I tried something differnt with th TimeSpan editor template:</p> <pre><code>@model TimeSpan? @Html.DropDownList("Hours", Enumerable.Range(0, 24) .Select(i =&gt; new SelectListItem { Value = i.ToString(), Text = i.ToString(), Selected = Model.HasValue ? Model.Value.Hours == i : false }))&amp;nbsp;: @Html.DropDownList("Minutes", Enumerable.Range(0, 60) .Select(i =&gt; new SelectListItem { Value = i.ToString(), Text = i.ToString(), Selected = Model.HasValue ? Model.Value.Minutes == i : false })) </code></pre> <p>This seems to have overcome this error but now I get an issue a little further down. In the view there is a DropDownList("ResourceTypes"....) This is essentially a dropdownlist that is used to control what appears in the DropDownListFor(model=>model.Event.ResourceID.....) There is a simple piece of JavaScript:</p> <pre><code>$(document).ready(function () { $("#ddlResourceTypes").change(function () { var idResourceType = $('#ddlResourceTypes').val(); $.getJSON("/Resource/LoadResourcesByType", { id: idResourceType }, function (resourceData) { var select = $("#ddlResources"); select.empty(); select.append($('&lt;option/&gt;', { value: 0, text: "-- Select Resource --" })); $.each(resourceData, function (index, itemData) { select.append($('&lt;option/&gt;', { value: itemData.Value, text: itemData.Text })); }); }); }); }); </code></pre> <p>Now the issue I get is:</p> <p>Object reference not set to an instance of an object</p> <p>On the DropDownList("ResourceTypes".....)</p> <p>Any ideas on this one?</p>
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