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Value Cannot Be Null. Parameter Name Source Entity Framework


Terms Privacy Security Status Help You can't perform that action at this time. I had changed the name of the "Task" poco class because of its association with a built in .NET name. Any help would be really appreciated, I'm starting to pull my hair out. In our case, we created a seperated project to handle the Entities and even if the default project in the Package Manager Console was the one handling the Entities, I need check over here

Insults are not welcome. Thats why where enumerator was throwing null source exception here: productsDb.AProducts.Where(a => a.Id== id) share|improve this answer edited Jul 2 '13 at 15:38 answered Jul 2 '13 at 15:23 Sergey Berezovskiy In some cases, returning a null object from a method like "getCustomerById(string id)" is fine, depending on your team coding style, but if you have a method that returns a collection Replace the possibly offending statements xyz with xyz ??

Value Cannot Be Null. Parameter Name: Connection

I just removed the stupid table from the include list and I am good to go. How do you enchant items with Lapis Luzuli? maumar commented Apr 7, 2016 @StefH I verified that this scenario works in current bits.

And I don't know to solve it UPDATE This is my code in image I fill ListMetadataKor with this code BWHelper.Run((s, e) => { DataTable dataMetaDataKOR = ExcelHelper.GetDataTableFromExcel( AppConstants.FILE_METADATA, AppConstants.SHEET_METADATA_KOR ); share|improve this answer edited Apr 1 at 18:53 Gonzalo.- 5,55522656 answered Mar 30 '12 at 10:22 wicky 10113 add a comment| up vote 4 down vote I think you can get Browse other questions tagged c# entity-framework c#-4.0 entity-framework-5 or ask your own question. Value Cannot Be Null. Parameter Name: Entitytype The errors I was seeing are as follows: Case 1 -> when using DBContext for EDM Message=Value cannot be null.

I believe it returns null if table dataMetaDataKOR is empty. Value Cannot Be Null Parameter Name Entity public class DurationExtended : Duration { } This happened during work in progress. How to handle swear words in quote / transcription? Parameter name: constructor0Value cannot be null.

Any ideas? Value Cannot Be Null C# Parameter name: querySource Stack Trace: at Microsoft.Data.Entity.Utilities.Check.NotNull[T](T value, String parameterName) at Microsoft.Data.Entity.Query.QuerySourceExtensions.HasGeneratedItemName(IQuerySource querySource) at Microsoft.Data.Entity.Query.ExpressionVisitors.RelationalEntityQueryableExpressionVisitor.VisitEntityQueryable(Type elementType) at Microsoft.Data.Entity.Query.ExpressionVisitors.EntityQueryableExpressionVisitor.VisitConstant(ConstantExpression constantExpression) at System.Linq.Expressions.ConstantExpression.Accept(ExpressionVisitor visitor) at Microsoft.Data.Entity.Query.ExpressionVisitors.ExpressionVisitorBase.Visit(Expression expression) at System.Linq.Expressions.ExpressionVisitor.VisitUnary(UnaryExpression node) at System.Linq.Expressions.UnaryExpression.Accept(ExpressionVisitor visitor) When have public fields ever been okay???? –Nick Williams Jul 2 '13 at 15:33 @PetePetersen I've added code which shows why simple fields will not be initialized –Sergey Berezovskiy To prevent this, you can use a null coalescing operator in your LINQ query like so: var filteredCollection = from item in getMyCollection() ??

  1. I think.
  2. Parameter name: source8How to resolve Value cannot be null.
  3. SpecialCustomerId { get; set; } public SpecialCustomer SpecialCustomer { get; set; } } public class SpecialCustomer : Customer { public string SomethingSpecial { get; set; } public List Customers { get;

Value Cannot Be Null Parameter Name Entity

What you should look for is a value that becomes null and prevent that. But now there's another ERROR... (one or more validation errors were detected during the model generation) Model ValidationException was unhandled by user System.Data.Edm.EdmEntityType::Entity Type 'Income' has no key defined.... Value Cannot Be Null. Parameter Name: Connection It happens sometimes, and I suspicious of my code that still have thread running while I close my Application. Value Cannot Be Null. Parameter Name Connectionstring The error you're getting is that it is null.

I am seen in darkness and in light, What am I? check my blog 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 This is connecting to a local Sql Server Database. What I'm basically doing here is that Tag Number has a foreign key from TagType table. Value Cannot Be Null Parameter Name Source Linq

Model is a DbSet in my context. Browse other questions tagged c# asp.net-mvc entity-framework or ask your own question. MathSciNet review alert? this content Why does top 50% need a -50% translate offset?

That either happens because you want to allow the Garbage Collector (GC) to recycle that memory or because you have some binding/automatic representation and want to clean the slate: string someText Value Cannot Be Null. Parameter Name Collection How can I save a file to a new location from inside Vim? Source is the enumerable you are filtering –Sergey Berezovskiy Feb 16 '15 at 9:09 @mrhands Check if ListMetadataKor is null or not . –Suraj Singh Feb 16 '15 at

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

Just check all references to this list in your code and look for assignments. Parameter name: source? 0 Getting exception when inserting an entity into a EF table 3 Entity Framework Code First connection 4 Outlook REST API error when filtering by attendee: “Value cannot Parameter name: source var nCounts = from sale in sal select new { SaleID = sale.OrderID, LineItem = from sli in sale.LineItems group sli by sli.Item into ItemGroup select new { Value Cannot Be Null. Parameter Name Value Find the "unwrapped size" of a list As a monk, can I use Deflect Missiles to protect my ally?

not in my development environment. C# TBB updating metadata value Scheduling a task into a period within a day, depending on whether or not it is a weekend How to prove that authentication system works, and share|improve this answer edited Jan 18 at 9:11 answered Apr 29 '13 at 14:32 Martin Mulder 8,23721037 2 This solved the problem to me, I suspect this is the solution have a peek at these guys StefH commented Apr 4, 2016 I'm glad I could help on this issue.

but sometimes in other computer it doen't work. That way you'll reach the largest audience. –Abel Jul 14 '10 at 8:16 add a comment| 6 Answers 6 active oldest votes up vote 77 down vote accepted The error you In the context of this quote, how many 'chips/sockets' do personal computers contain? Will I get the same result if I use 18-55mm lens at 55mm (full zoom) and 55-200mm lens at 55mm (no zoom), if not, then why?

That either happens because you want to allow the Garbage Collector (GC) to recycle that memory or because you have some binding/automatic representation and want to clean the slate: string someText