because it has a DefiningQuery and no element exists in the element

It has a DefiningQuery element but no InsertFunction... err

Well when a table is encountered without a PrimaryKey it is treated as a View....And views show up in the EDMX file (open in an XML editor to see) in the StorageModel\EntitySet[n]\DefiningQuery element....When you have a DefiningQuery the Entity becomes readonly unless you add modification functions. You need 3 modifications functions (aka Stored P...

Because it contains a DefiningQuery and no UpdateFunction> element, the EntitySet cannot be updated.

It usually happens because one of the following reasons:...Entity Set is mapped from Database view...A custom Database query...Database table doesn't have a primary key...After doing so, you may still need to update in the Entity Framework designer (or alternatively delete the entity and then add it) before you stop getting the error.

Another System.InvalidOperationException: Sequence contains no elements (using .Any())

The proper use would be...return chatUserRepository.Table.Any(c => c.TrackingOn)

Unable to Run Code First Seed Method - Sequence contains more than one element

I am unable to insert records to a table, receiving the error Sequence contains more than one element. The Entity that I want to add inherits from another table in a Table Per Hierachy (TPH) relationship like to....public abstract class Reward { public int RewardId { get; set; } [Display(Name = "Retailer")] public int R...

How to resolve Warning : The element 'entityFramework' has invalid child element 'providers'. List of possible elements expected: 'contexts'

The configuration schema was changed from version 5 to 6. As it says, the providers node was replaced with a contexts node....The idea is that you can configure the providers individually instead of all contexts using the same provider. (This goes in tandem with being able to have multiple contexts that reside within one database. This used to be...

The element 'entityFramework' has invalid child element Entity Framework

i create new project web asp.net mvc 4 and when i go to tools -> library package manager -> manage nuget solution for package. and installed the Entity Framework. after installing warning show in list is ...Warning: The element 'entityFramework' has invalid child element 'providers'. List of possible elements expected: 'contexts'....i am using visu...

Error initializing entity framework database sequence contains no matching elements

I've been staring at this for the last 5 hours, trying a bunch of things, but I'm not getting anywhere......When I try to start my MVC website who's database I've created using Entity Framework Code First, the database fails to initialize, throwing the following exception message: ...Sequence contains no matching elements...The first line of the s...

Effort throws InvalidOperationException: Sequence contains more than one matching element

I'm using Effort in a regular way by creating a connection and passing it to DB Context:...public class InMemoryContextInitializer { public void BeforeAllTests() { Effort.Provider.EffortProviderConfiguration.RegisterProvider(); } public DbConnection BeforeEachTest() { return Effort.DbConnectionFactory.CreateTran...

Effort (C#) - 'Sequence contains no matching element' when seeding data to any of my entities

hope this helps....Many answers says you have to add ...FirstorDefault()... in your EF statements but this error also occurs in the incorrect properties using data annotations. ...When using Data Annotations, be careful with the properties that you add. ...Example below, I missed the ...TypeName = "string"..., which should have been ...nvarchar... ...

"Sequence contains no matching element" setting HasColumnType("varchar") in EF Mappings using Effort

I have the following Entity Framework (v6.1.3) mapping:...public class FileStoreDocumentEntityMapping : EntityTypeConfiguration<FileStoreDocumentEntity> { public FileStoreDocumentEntityMapping() { Property(x => x.FileStoreDownloadUrl) .HasColumnName("FileStoreDetailsUrl") .HasColumnType("varchar") ...