非常奇怪，一切正常，
我在我的表单中显示所有文本框，所有复选框，但是当我发送表单时，我的控制器中的第一个字符串示例出现错误：
creation.Creation.CreationPhotoBis = fileName200;
告诉我，creation.Creation.CreationPhotoBis为NULL
StackTrace：
à HairCollection3.Controllers.CreationController.CreationUpload(CreationHairTagsModel creation, IEnumerable`1 files) dans c:\FRANCESCO\Project\HairCollection3\HairCollection3\Controllers\CreationController.cs:ligne 650
à lambda_method(Closure , ControllerBase , Object[] )
à System.Web.Mvc.ActionMethodDispatcher.Execute(ControllerBase controller, Object[] parameters)
à System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters)
à System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters)
à System.Web.Mvc.Async.AsyncControllerActionInvoker.ActionInvocation.InvokeSynchronousActionMethod()
à System.Web.Mvc.Async.AsyncControllerActionInvoker.<BeginInvokeSynchronousActionMethod>b__36(IAsyncResult asyncResult, ActionInvocation innerInvokeState)
à System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult`2.CallEndDelegate(IAsyncResult asyncResult)
à System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResultBase`1.End()
à System.Web.Mvc.Async.AsyncResultWrapper.End[TResult](IAsyncResult asyncResult, Object tag)
à System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethod(IAsyncResult asyncResult)
à System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3c()
à System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.<>c__DisplayClass45.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3e()
错误：
{"Object reference not set to an instance of an object."}
InnerEception：创作
null
实际上在我的模型CreationHairTagsModel模型Creation = = Null !!!为什么呢？
我需要修理吗？这是我的模型Creation.cs
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Web;
using System.Web.Mvc;
namespace HairCollection3.Models
{
public class Creation
{
public string UserId { get; set; }
[Key]
public int CreationId { get; set; }
public string CreationLanguage { get; set; }
[Required(ErrorMessageResourceName = "Required", ErrorMessageResourceType = typeof(ViewRes.ValidationStrings))]
[Display(Name = "Sex", ResourceType = typeof(ViewRes.Names))]
public string CreationSex { get; set; }
[Required(ErrorMessageResourceName = "Required", ErrorMessageResourceType = typeof(ViewRes.ValidationStrings))]
[Display(Name = "CreationTitle", ResourceType = typeof(ViewRes.NamesCreation))]
[StringLength(2000)]
[AllowHtml]
public string CreationTitle { get; set; }
public bool CreationVisible { get; set; }
public bool CreationDelete { get; set; }
public DateTime CreationDate { get; set; }
public string CreationIpAdress { get; set; }
public string CreationPhotoBis { get; set; }
public string CreationPhoto750 { get; set; }
public string CreationPhotoReal { get; set; }
public string Creationtag { get; set; }
public virtual ICollection<CreationLike> CreationLikes { get; set; }
}
public class CreationLike
{
public int CreationId { get; set; }
public string UserId { get; set; }
public virtual ApplicationUser User { get; set; }
[Key]
public int CreationLikeId { get; set; }
public DateTime CreationLikeDate { get; set; }
public string CreationLikeIpAdress { get; set; }
public virtual Creation ParentCreation { get; set; }
}
public class HairTag
{
[Key]
public int HairTagId { get; set; }
[Required]
public string HairTagTitle { get; set; }
[Required]
public string HairTagTitleEN { get; set; }
[Required]
public string HairTagTitleIT { get; set; }
[Required]
public string HairTagTitleSP { get; set; }
[Required]
public string HairTagType { get; set; }
[Required]
public int HairTagOrder { get; set; }
}
//CHECKBOXES
public class HairTagModel
{
[Key]
public int Value { get; set; }
public string Text { get; set; }
public bool IsChecked { get; set; }
}
public class HairTagList
{
private ApplicationDbContext creationdb = new ApplicationDbContext();
public HairTagList()
{
var HairTagList = creationdb.HairTags.ToList();
List<HairTagModel> obj = new List<HairTagModel>();
foreach (var tags in HairTagList)
{
obj.Add(new HairTagModel
{
Text = tags.HairTagTitle,
Value = tags.HairTagId,
IsChecked = false
});
}
this.CreationHairTags = obj;
}
public List<HairTagModel> CreationHairTags { get; set; }
//public List<HairTagModel> ListHairTags { get; set; }
}
public class CreationHairTagsModel
{
//public Creation Creation { get; set; }
//public List<HairTagModel> CreationHairTags { get; set; }
public Creation Creation { get; set; }
private ApplicationDbContext creationdb = new ApplicationDbContext();
public List<HairTagModel> CreationHairTags
{
get
{
var HairTagList = creationdb.HairTags.ToList();
List<HairTagModel> obj = new List<HairTagModel>();
foreach (var tags in HairTagList)
{
obj.Add(new HairTagModel
{
Text = tags.HairTagTitle,
Value = tags.HairTagId,
IsChecked = false
});
}
return obj;
}
}
}
}
这是我的控制器CreationController.cs
// GET: /Creation/CreationUpload
[Authorize]
public ActionResult CreationUpload()
{
CreationHairTagsModel creation = new CreationHairTagsModel();
return View(creation);
//return View();
}
// POST: /Creation/CreationUpload
// Afin de déjouer les attaques par sur-validation, activez les propriétés spécifiques que vous voulez lier. Pour
// plus de détails, voir http://go.microsoft.com/fwlink/?LinkId=317598.
[HttpPost]
[Authorize]
[ValidateAntiForgeryToken]
public ActionResult CreationUpload([Bind(Include = "CreationId,CreationSex,CreationTitle,CreationPhotoBis,CreationHairTags")] CreationHairTagsModel creation, IEnumerable<HttpPostedFileBase> files)
{
if (ModelState.IsValid)
{
// update each field manually
foreach (var file in files)
{
if (file != null)
{
if (file.ContentLength > 0)
{
...UPLOAD CODE HIDDEN
creation.Creation.CreationPhotoBis = fileName200;
//Ipaddress
var ipAddress = Request.ServerVariables["REMOTE_ADDR"];
//Avoid Script
var CreationTitletocheck = Regex.Replace(creation.Creation.CreationTitle, @"<script\b[^<]*(?:(?!<\/script>)<[^<]*)*<\/script>", string.Empty);
CreationTitletocheck = Regex.Replace(CreationTitletocheck, @"(?></?\w+)(?>(?:[^>'""]+|'[^']*'|""[^""]*"")*)>", string.Empty);
creation.Creation.CreationTitle = CreationTitletocheck;
//Tags
StringBuilder sb = new StringBuilder();
foreach (var item in creation.CreationHairTags)
{
if (item.IsChecked)
{
sb.Append(item.Text + ",");
}
}
creation.Creation.Creationtag = sb.ToString();
creation.Creation.UserId = User.Identity.GetUserId();
creation.Creation.CreationLanguage = ViewRes.Shared.Langue;
creation.Creation.CreationVisible = true;
creation.Creation.CreationDelete = false;
creation.Creation.CreationDate = DateTime.Now;
creation.Creation.CreationIpAdress = ipAddress;
creation.Creation.CreationPhotoReal = fileName; //after add
db.Creations.Add(creation.Creation);
db.SaveChanges();
}
}
}
}
//UserId
return RedirectToAction("CreationList", "Creation", new { UserId = User.Identity.GetUserId() });
}
return View(creation);
}
这里我的观点：CreationUpload.cshtml
@model HairCollection3.Models.CreationHairTagsModel
@using Microsoft.AspNet.Identity
@{
ViewBag.Title = ViewRes.NamesCreation.CreationUploadTitle;
}
<div class="col-sm-12 col-md-12 chpagetop">
<h1>@ViewRes.Shared.PublishAPhoto</h1>
<hr />
@using (Html.BeginForm("CreationUpload", "Creation", FormMethod.Post, new { id = "CreationUpload", enctype = "multipart/form-data", onsubmit = "$('#creationloading').show(); $('#creationform').hide();" }))
{
@Html.AntiForgeryToken()
<div class="col-md-12" id="creationloading" style="display:none">
<div id="progress">
<p>@ViewRes.Shared.UploadPhotoProgress<strong>0%</strong></p>
<progress value="5" min="0" max="100"><span></span></progress>
</div>
</div>
<div class="col-md-12" id="creationform">
<div class="col-md-12">
@Html.ValidationMessageFor(m => m.Creation.CreationSex)
@Html.RadioButtonFor(m => m.Creation.CreationSex, "F", new { @checked = true }) @ViewRes.Shared.WomanHairstyle @Html.RadioButtonFor(m => m.Creation.CreationSex, "M") @ViewRes.Shared.ManHairstyle
</div>
<div class="col-md-12">
@Html.ValidationMessageFor(m => m.Creation.CreationTitle)
@Html.TextBoxFor(m => m.Creation.CreationTitle, new { @class = "inputplaceholderviolet wid100x100", placeholder = HttpUtility.HtmlDecode(Html.DisplayNameFor(m => m.Creation.CreationTitle).ToHtmlString()), onfocus = "this.placeholder = ''", onblur = "this.placeholder = '" + HttpUtility.HtmlDecode(Html.DisplayNameFor(m => m.Creation.CreationTitle).ToHtmlString()) + "'" })
</div>
<div class="col-md-12">
@for (int i = 0; i < Model.CreationHairTags.Count; i++)
{
@Html.CheckBoxFor(m => Model.CreationHairTags[i].IsChecked)
@Model.CreationHairTags[i].Text
@Html.HiddenFor(m => Model.CreationHairTags[i].Value)
@Html.HiddenFor(m => Model.CreationHairTags[i].Text)<br />
}
</div>
<div class="col-md-12" style="text-align: center">
<p style="display: inline-block">
<input type="file" accept="image/*" onchange="loadFile(event)" name="files" id="file1" translate="yes" data-val="true" data-val-required="A File is required." class="wid100x100" /><label for="file1"></label>
<img id="output" style="max-width:200px;" />
</p>
</div>
<div class="col-sm-12 col-md-12 chpagetopdiv">
<button type="submit" title="@ViewRes.Shared.Publish"><span class="glyphicon glyphicon-share-alt"></span> @ViewRes.Shared.Publish</button>
</div>
</div>
}
</div>
在我的IdentityModels.cs
中using Microsoft.AspNet.Identity;
using Microsoft.AspNet.Identity.EntityFramework;
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Data.Entity;
using System.Data.Entity.ModelConfiguration.Conventions;
using System.Web.Mvc;
namespace HairCollection3.Models
{
// You can add profile data for the user by adding more properties to your ApplicationUser class, please visit http://go.microsoft.com/fwlink/?LinkID=317594 to learn more.
public class ApplicationUser : IdentityUser
{
// New Fields added to extend Application User class:
CODE USER HIDDEN
}
public class ApplicationDbContext : IdentityDbContext<ApplicationUser>
{
public ApplicationDbContext()
: base("DefaultConnection")
{
}
public DbSet<Creation> Creations { get; set; }
public DbSet<CreationLike> CreationLikes { get; set; }
public DbSet<HairTag> HairTags { get; set; }
我的代码有什么问题请帮忙解释一下？
答案 0 :(得分：1)
当ModelBinding实例化CreationHairTagsModel时，Creation属性为null。
尝试在Creation构造函数中初始化CreationHairTagsModel属性，以便在ModelBinding创建CreationHairTagsModel时，Creation不会为空。
public CreationHairTagsModel()
{
Creation = new Creation();
}