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Value Cannot Be Null Dbcontext Type

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Because you can't do anything with a null Reference other than assign it - something and that makes no sense for most functions. Can you dispel a magic effect you can't perceive? I had changed the name of the "Task" poco class because of its association with a built in .NET name. Michael Taylor - 2/11/2013 http://msmvps.com/blogs/p3net Marked as answer by linkit Tuesday, February 12, 2013 8:14 AM Monday, February 11, 2013 3:05 PM Reply | Quote Moderator All replies 0 Sign in weblink

The error you're getting is that it is null. Therefore if you want to take advantage of this functionality you have to ensure that your context that you passed to originally fetch the data remains open until you retrieve the Not the answer you're looking for? But if the data in the database says it shouldn't be empty then your query is wrong.

Value Cannot Be Null Parameter Name Entity

if you don't then the call will fail. This is connecting to a local Sql Server Database. How can I claim compensation? Parameter name: source0Entity Framework: Sql Parameter already contained by another sql collection Hot Network Questions How to stop NPCs from picking up dropped items US Election results 2016: What went wrong

more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed In the context of this quote, how many 'chips/sockets' do personal computers contain? Parameter name: source Jul 01, 2011 05:35 PM|Vivi1985|LINK I would give you a kiss if I could!!! Value Cannot Be Null. Parameter Name: Dbcontexttype Parameter name: extent Here is the Context Class public class WheelTrackDb : DbContext { public WheelTrackDb(): base("DefaultConnection"){ } protected override void OnModelCreating(DbModelBuilder modelBuilder) { modelBuilder.Entity() .HasRequired(d => d.Vehicle) .WithOptional(v => v.Driver)

Lab colleague uses cracked software. tableCustomer has a Primary Key "CustomerID" or "CID" (if that is not ambigious/used by multipe tables) tableBill has a Primary Key "BillID" or "BID" and a Foreign Key "FK_CID". Hate myself quite a bit right now. When I changed the model property ExposureDuration to type DurationExtended, all was working again.

I created a Income.cs (Model Class) with using System; using System.Collections.Generic; using System.Linq; using System.Web; namespace ProbandoBD.Models { public class Income { public int idIncome { get; set; } public float System.argumentnullexception Value Cannot Be Null. Parameter Name Connection Parameter name: navigation ` Does anyone know what causes it? Sign in to comment Contact GitHub API Training Shop Blog About © 2016 GitHub, Inc. why does this error keep popping out?

  1. What I'm basically doing here is that Tag Number has a foreign key from TagType table.
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  5. in expression 1 Property containing subset of related object Related 0Value cannot be null, parameter name: source1LINQ Entity Framework Value cannot be null.

Value Cannot Be Null. Parameter Name: Entitytype

Is the above "TagTypes_TagTypesID" part of the foreign key in TagNumber table? (The sql statement that comes through in the entity is with this column, but I do not have such Columns in TagNumber Table: CREATE TABLE [dbo].[TagNumbers]( [TagNumberID] [int] IDENTITY(1,1) NOT NULL, [TagSerialNumber] [nvarchar](100) NOT NULL, [TagTypeRef] [int] NOT NULL, [CoreUserRef] [int] NOT NULL, [DateStamp] [datetime] NOT NULL, CONSTRAINT [PK_TagNumbers] PRIMARY Value Cannot Be Null Parameter Name Entity Parameter name: source" Entity Framework Code First2Does EF Migrations Support Adding Not Null Foreign Keys0Entity Framework - Add Migration Creating For Entities In External Assembly0HasMaxLength value increase in entity type configuration Value Cannot Be Null Parameter Name Entity Mvc Parameter name: source [Answered]RSS 8 replies Last post Jul 01, 2011 05:56 PM by CodeHobo ‹ Previous Thread|Next Thread › Print Share Twitter Facebook Email Shortcuts Active Threads Unanswered Threads Unresolved

Why does Cutie act like this and lesser robots listen to it? have a peek at these guys I just want to add an entity to the table. As Sergey Berezovskiy has demonstrated in his answer, EF requires all class members to be public properties to initalise them. Parameter name: source Jul 01, 2011 04:58 PM|Vivi1985|LINK Full of me!! Value Cannot Be Null Entity Framework

Parameter name: source stacktrace of [ArgumentNullException: Value cannot be null. Parameter name: source Jul 01, 2011 05:04 PM|CodeHobo|LINK EF code first works on convention and expects your primary key to be "somethingId", in your case it's expecting public int IncomeId{ get; Because you can't do anything with a null Reference other than assign it - something and that makes no sense for most functions. check over here I corrected it!

Any ideas? Value Cannot Be Null. Parameter Name: Entityset Reload to refresh your session. In this case you have to specifically tell it that it's the id like so: public class Income { [Key] public int idIncome { get; set; } public float?

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In the database is there a FK relationship between the type owning TagNumbers and the column that the field is being mapped to? So somewhere a function that takes a Reference Type Parameter by name "Source" (names are shown when IntelliSense proposes a function) get's a null value. Parameter name: source Jul 01, 2011 05:56 PM|CodeHobo|LINK try public class Income { [Key] public int idIncome { get; set; } public decimal countIncome { get; set; } public DateTime? Value Cannot Be Null Parameter Name Source Linq Parameter name: source" Entity Framework Code First604Entity Framework 5 Updating a Record40Value cannot be null.

Basic Geometric intuition, context is undergraduate mathematics Polyglot Anagrams Cops' Thread Understanding model independently the equivalence of two ways of obtaining homotopy types from categories. var db = new hublisherEntities(); establishment_brands est = new establishment_brands(); est.brand_id = 1; est.establishment_id = 1; est.price = collection["price"]; est.size = collection["size"]; db.establishment_brands.Add(est); db.SaveChanges(); This gives me an error of Value How to stop NPCs from picking up dropped items Can you dispel a magic effect you can't perceive? this content hope this can help somebody.

Parameter name: querySource" in DNX452 + SQLite/MSSqlServer Apr 4, 2016 StefH changed the title from Select related entities throws "Value cannot be null. smitpatel referenced this issue Jun 8, 2016 Closed ForeignKeyAttribute can't be overriden with explicit configuration #5695 Sign up for free to join this conversation on GitHub. Parameter name: extent up vote 10 down vote favorite 3 I'm using EF6 code first to create my db. This error message often crops up when your connection string is wrong.

Rising Storm Technologies Monday, February 11, 2013 1:20 PM Reply | Quote 1 Sign in to vote So are you using EF? Any help would be greatly appreciated. And I checked thrice, it only has dbset properties. Find out if you put a query togehter (somewhere outside your example code) where you are using a LINQ-method, or that you used an IEnumerable as a parameter which is NULL.

Not the answer you're looking for? Why were pre-election polls and forecast models so wrong about Donald Trump? Why does top 50% need a -50% translate offset? My schema looks like every column can be null. –danielovich Apr 29 '13 at 14:34 1 Could you post your connection string? –anaximander Apr 29 '13 at 14:37 add a

Privacy statement Dev Centers Windows Office More... Reply CodeHobo Star 13415 Points 2610 Posts Re: System.ArgumentNullException!!! Polyglot Anagrams Cops' Thread How do you enchant items with Lapis Luzuli? If the data loads then you have a context lifetime issue.

The error you're getting is that it is null. Another thing to note if you're using EF is that it uses lazy loading on virtual navigation properties (ex TagNumbers).