Entity Framework 6 - Knowledge Base (KB)
58 results for: in tag: ef-fluent-api
Entity Framework Code First - Advantages and disadvantages of Fluent Api vs Data Annotations
When creating a database using Entity Framework code-first, a lot of the database model is can be extracted from the code. Fluent API and/or Attributes can be used to fine tune the model....What are the advantages and disadvantages of Fluent Api in compar...
asked by Sam
Mapping to already existing database table
I am using ...Entity Framework 4.1 code first... to connect to an already existing database. The table that I am using first is called ...Bank.... I also have a ...Bank class... as my domain model. This is how I mapped my class and table:...public clas...
asked by Brendan Vogt
One to one relationship with Entity Framework Fluent API
I'm having trouble with reverse navigation on one of my entities. ...I have the following two objects:...public class Candidate { [Key, DatabaseGenerated(DatabaseGeneratedOption.Identity)] public long CandidateId { get; set; } .... // Re...
asked by William
How to define Many-to-Many relationship through Fluent API Entity Framework?
Below is my model:...public class TMUrl { //many other properties //only property with type Keyword public List<Keyword> Keywords{get;set;} } public class Keyword { //many other properties //only property with type TMUrl public Li...
asked by Manish Mishra
One to one optional relationship using Entity Framework Fluent API
We want to use one to one optional relationship using Entity Framework Code First. We have two entities....public class PIIUser { public int Id { get; set; } public int? LoyaltyUserDetailId { get; set; } public LoyaltyUserDetail LoyaltyUserDe...
asked by Ä°lkay Ä°lknur
EntityFramework Code First FluentAPI DefaultValue in EF6.X
How can I set the default value using EntityFramework Code First FluentAPI for bool property?...Something like:...Property(l => l.PropertyFlag).HasColumnType("bit").DefaultValue(1);
asked by Tony Bao
Foreign key issues in EF6 CF
Excuse me for being a noob with EF when it comes to code first. My problem is I don't want to add foreign key properties to the model and according to MSDN this presents no problem using the fluent API, however I can not figure out the correct use for my ...
asked by weagle08
Setting unique Constraint with fluent API?
I'm trying to build an EF Entity with Code First, and an ...EntityTypeConfiguration... using fluent API. creating primary keys is easy but not so with a Unique Constraint. I was seeing old posts that suggested executing native SQL commands for this, but t...
asked by kob490
Multiple indexes possible using HasColumnAnnotation?
It looks like in Entity Framework 6.1 they added the ability to create table indexes via the new ...HasColumnAnnotation... method. I created a few helper extensions to speed up the process:...public static class MappingExtensions { public static Strin...
asked by Sam
The declared type of navigation property Project.Models.Customer.SubCustomers is not compatible with the result of the specified navigation
I have had a look at answers to similar errors, but I can't seem to find an answer to my particular error....I am running a migration and the error happens when the seed method is run (migration has worked fine)....The declared type of navigation property...
asked by tekiegirl
Entity Framework Code First Fluent API configuration for one to one identifying relationship
I have the following class structure:...How to configure Fluent API to put identifying relationship in Cards table? ...I mean ...Cards Table PK: Id, CustomerId...Cards Table FK: CustomerId...I would like the previous Card be deleted when I assign a new on...
asked by Dmitry Nogin
One or Zero to One Entity Framework Code First FluentApi
I need to create fluentapi one or zero to one reference and have navigation properties on both of entities. ...EntityTwo should contain simple proerty to store foreign key (EntityOneId)...public class EntityOne { public int Id { get; set; } public...
asked by Oleg Gochachko
Set a constraint for minimum int value
I am using the Repository pattern. I have a entity called Product and I want to set the minimum value for price to avoid zero prices. Is it possible to create it in a EntitytypeConfiguration class?...My product configuration class... public class ProductC...
asked by Rodrigão
Entity Framework Code first: cycles or multiple cascade paths
I have a Booking class that has a booking contact (a ...Person...) and a set of navigation properties (...People...) that links through a join table to another set of navigation properties (...Bookings...) in ...Person.... How do I generate the ...Booking...
asked by James Peters
Mapping object type property to varbinary(MAX) in Entity Framework
I have a situation where I have a type with a property of type ...object..., eg....public class MyType { public virtual object MyProp{get; get;} } ...This type will have to be:...Saved using ...Entity Framework... to a database, as a ...byte[]... (I ha...
asked by user919426
Optional One-to-many Relationship in Entity Framework
I'm having issues getting an optional one-to-many relationship to work....My model is:...public class Person { public int Identifier { get; set; } ... public virtual Department Department { get; set; } } public class Department { public i...
asked by givemelight
How to create Lookup table and define relationships
As you can see at below, there are a Lookup table for the enum values and I want to create a relationship between a table's enum values and ...LookupKey... column of the Lookup table (instead of ID column of the Lookup table). ...Lookup table:...ID | Lo...
asked by Jack
Violation of primary key Entity Framework Code First
I have started with C# and I wanted to make my own DB....I have two models...public class AModel { public Guid ID { get; private set; } public string Name { get; set; } public int Count { get; set; } public AModel() { this.ID ...
asked by Tomas Bruckner
How to add an index on multiple columns with ASC/DESC sort using the Fluent API?
I have a MVC ASP.NET application using Entity Framework 6 - Code First approach. ...Using the Fluent API, how can I add an index on multiple columns with ASC/DESC sort that is different for each column ?...I've seen many examples using multiple columns b...
asked by Maxime
Entity Framework 6 NotMapped attributes
Is there a way using the fluentAPI within a DbContext to manually include ICollections that have been [NotMapped] in the model? I know how to manually ignore properties using the fluentAPI ...modelBuilder.Entity<MyEntity>().Ignore(e => e.MyChildCollection...
asked by Ted
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