using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Linq;
using System.Web;
namespace Church_On_The_Rock.Models
{
public class News
{
public int NewsId { get; set; }
public string Title { get; set; }
public string Writer { get; set; }
[DisplayFormat(DataFormatString = "{0:MMMM dd, yyyy}",
ApplyFormatInEditMode = true)]
public DateTime Date { get; set; }
public byte[] Picture { get; set; }
public string Blog { get; set; }
}
//I know the problem is here but don't know what to do
public class ExtendedNewsModel: News
{
public HttpPostedFileBase postedPicture { get; set; }
}
}
Here is my Data access code:
public ActionResult Create(ExtendedNewsModel news)
{
if (ModelState.IsValid)
{
if (news.postedPicture != null)
{
if (news.postedPicture.ContentLength > (8 * 1024 * 1024))
{
ModelState.AddModelError("CustomError", "Image can not be larger than 8MB.");
return View();
}
if (!(news.postedPicture.ContentType == "image/jpeg" || news.postedPicture.ContentType == "image/png" || news.postedPicture.ContentType == "image/gif"))
{
ModelState.AddModelError("CustomError", "Image must be in jpeg,png or gif format");
}
}
byte[] data = new byte[news.postedPicture.ContentLength];
news.postedPicture.InputStream.Read(data, 0, news.postedPicture.ContentLength);
news.Picture = data;
db.New.Add(news);
db.SaveChanges();
return RedirectToAction("Index");
}
return View(news);
}
Here is my View:
@model Church_On_The_Rock.Models.ExtendedNewsModel
@{
ViewBag.Title = "Create";
}
@using (Html.BeginForm("Create","Home", FormMethod.Post, new {role = "form", enctype = "multipart/form-data"}))
{
@Html.AntiForgeryToken()
<div class="form-group createforms">
<span>@Html.LabelFor(model => model.Picture, htmlAttributes: new {
@class = "Control-label col-md-2" })</span>
<div class="col-md-10">
@Html.TextBoxFor(model => model.postedPicture, new {type
="file" })
@Html.ValidationMessage("customMessage")
</div>
</div>
<div class="form-group">
<div class="col-md-offset-2 col-md-10 createbutton">
<input type="submit" value="Create" class="btn btn-default" />
</div>
</div>
}
Every time I update the database or run the code in a browser, it gives me this error:
"Value cannot be null. Parameter name: entitySet".
Here is the call stack:
System.ArgumentNullException: Value cannot be null.
Parameter name: entitySet
at System.Data.Entity.Utilities.Check.NotNull[T](T value, String parameterName)
at System.Data.Entity.Core.Mapping.EntitySetMapping..ctor(EntitySet entitySet, EntityContainerMapping containerMapping)
at System.Data.Entity.ModelConfiguration.Edm.DbDatabaseMappingExtensions.AddEntitySetMapping(DbDatabaseMapping databaseMapping, EntitySet entitySet)
at System.Data.Entity.ModelConfiguration.Edm.Services.TableMappingGenerator.Generate(EntityType entityType, DbDatabaseMapping databaseMapping)
at System.Data.Entity.ModelConfiguration.Edm.Services.DatabaseMappingGenerator.GenerateEntityTypes(DbDatabaseMapping databaseMapping)
at System.Data.Entity.ModelConfiguration.Edm.Services.DatabaseMappingGenerator.Generate(EdmModel conceptualModel)
at System.Data.Entity.DbModelBuilder.Build(DbProviderManifest providerManifest, DbProviderInfo providerInfo)
at System.Data.Entity.DbModelBuilder.Build(DbConnection providerConnection)
at System.Data.Entity.Internal.LazyInternalContext.CreateModel(LazyInternalContext internalContext)
at System.Data.Entity.Internal.RetryLazy`2.GetValue(TInput input)
at System.Data.Entity.Internal.LazyInternalContext.InitializeContext()
at System.Data.Entity.Internal.LazyInternalContext.get_ModelBeingInitialized()
at System.Data.Entity.Infrastructure.EdmxWriter.WriteEdmx(DbContext context, XmlWriter writer)
at System.Data.Entity.Utilities.DbContextExtensions.<>c__DisplayClass1.<GetModel>b__0(XmlWriter w)
at System.Data.Entity.Utilities.DbContextExtensions.GetModel(Action`1 writeXml)
at System.Data.Entity.Utilities.DbContextExtensions.GetModel(DbContext context)
at System.Data.Entity.Migrations.DbMigrator..ctor(DbMigrationsConfiguration configuration, DbContext usersContext, DatabaseExistenceState existenceState, Boolean calledByCreateDatabase)
at System.Data.Entity.Migrations.DbMigrator..ctor(DbMigrationsConfiguration configuration)
at System.Data.Entity.Migrations.Design.ToolingFacade.BaseRunner.GetMigrator()
at System.Data.Entity.Migrations.Design.ToolingFacade.UpdateRunner.Run()
at System.AppDomain.DoCallBack(CrossAppDomainDelegate callBackDelegate)
at System.AppDomain.DoCallBack(CrossAppDomainDelegate callBackDelegate)
at System.Data.Entity.Migrations.Design.ToolingFacade.Run(BaseRunner runner)
at System.Data.Entity.Migrations.Design.ToolingFacade.Update(String targetMigration, Boolean force)
at System.Data.Entity.Migrations.UpdateDatabaseCommand.<>c__DisplayClass2.<.ctor>b__0()
at System.Data.Entity.Migrations.MigrationsDomainCommand.Execute(Action command)
But when I comment out The class ExtendedNewsModel, it updates the database and runs in a browser.
I want to know what I am doing wrong or if there is another way to just use HttpPostedFileBase without putting it in a class and also how to render it to a View.
