Entity Framework Core - Knowledge Base (KB)
240 results for: in tag: ef-code-first
EF code-first: How to load related data (parent-child-grandchild)?
I have this entity:...public class DynamicPage { public int PageId { get; set; } public int Order { get; set; } public string MenuText { get; set; } public string MenuHover { get; set; } public int? ParentId { get; set; } pub...
asked by ravy amiry
Entity Framework and Migration with multiple schemas in a single Context
I am developing a multi-tenant application with Entity Framework Code First. Each tenant will have a different schema in the database, but the application will have a single Context and model for all tenants. ...The Entity Framwork 6 is able to use multi...
asked by Bruno Albano de Souza
In Entity Framework, why isn't lazy loading working for a one-to-zero-or-one navigation property?
Consider ...Person... and ...Address... classes defined as...class Person { public int PersonId { get; set; } public virtual Address Address { get; set; } } class Address { public int PersonId { get; set; } public virtual Person Person { get; set...
asked by Mike
The type 'Company.Model.User' and the type 'Company.Core.Model.User' both have the same simple name of 'User' and so cannot be used in the same model
I have a base entity class ...MyCompany.Core.Model.User... which is to be used for common properties of a ...User... entity:...public class User { public string Username { get; set; } public string Usercode { get; set; } } ...I also have a base ma...
asked by Brett Postin
What is the correct use of IDatabaseInitializer in EF?
I have a custom DatabaseInitialiser which is below.../// <summary> /// Implements the IDatabaseInitializer to provide a custom database initialisation for the context. /// </summary> /// <typeparam name="TContext">TContext is the DbContext</typeparam> pub...
asked by ashutosh raina
Entity Framework 6 Code First function mapping
I want integrate Entity Framework 6 to our system, but have problem....I want to use Code First. I don’t want to use Database First *.edmx file for other reasons....I use attribute mapping [Table], [Column] and this works fine...Database has many User-D...
asked by Alexey
Save detached object graph using Entity Framework code first causes Primary Key violation
I'm trying to save an object graph of POCOs I have mapped to EF6 using Code First fluent notations....Upon saving the object graph however, I stumble upon primary key violation exceptions....The object graph is quite simple:...One ...Issue... can contain ...
asked by Robert Sirre
How to resolve Warning : The element 'entityFramework' has invalid child element 'providers'. List of possible elements expected: 'contexts'
I'm playing around with EF different workflows. Yesterday I made a new project and ...Entity Framework 6... was the first suggestion from ...Nuget... so I decided to give it a try, also it is a very small project entirely for learning purposes so I guess ...
asked by Leron_says_get_back_Monica
How can set a default value constraint with Entity Framework 6 Code First?
In a legacy app, most string properties can't be null and need to have a default value of string.empty....I know it's possible to do this with migrations, but I'm looking for a way to do this using the fluent configuration interface:... protected overr...
asked by ECC-Dan
How to avoid Lazy Loading when accessing foreign key ID property through navigation property?
I'm in the process of converting a project from NHibernate to Entity Framework 6....Given this simple model: ...public class User { public int ID { get; set; } public string FullName { get; set; } public virtual Organization Organization { get...
asked by ECC-Dan
Nullable fields are created when customizing IdentityUser class in asp.net Identity
I am trying to customize IdentityUser class in asp.net identity....public class ApplicationUser : IdentityUser { public ApplicationUser() { IsBlocked = false; } public bool IsBlocked { get; set; } } ...The problem is: when using c...
asked by aleyush
Entity Framework: The provider did not return a providermanifest instance
Entity Framework 6.0.1 my App.config:...<?xml version="1.0" encoding="utf-8"?> <configuration> <configSections> <!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 --> <section name="e...
asked by Temaska
Issue loading child entity of a parent entity. Unidirectional mapping and 1 to 0..1 relationship with a Shared primary Key?
When I try to load child entity of parent entity it loads with default values. If i try to load explicitly it throws exception ...Multiplicity constraint violated.... The role 'Association_Customer_Target' of the relationship 'CodeFirstNamespace.Associati...
asked by Mady
How to change the naming convention of Many-to-Many table relationships?
How can I go about changing the naming convention of the auto-generated many-to-many table?...Assume I have two classes:...public class User { public int UserId { get; set; } public virtual List<Role> Roles { get; set; } } public class Role { ...
asked by Nathan A
Why is ON DELETE SET NULL still not implemented in the Entity Framework 6? Is there a snag?
It still is not possible to configure a relation with the ON DELETE SET NULL rule using Entity Framework code first. As a workaround you have to load all the related entities in memory and ...then... on deletion of the parent entity EF will issue SQL comm...
asked by Dabblernl
IsRowVersion can only be configured for Byte array properties
I recently upgraded from EntityFramework 5 to 6 via the NuGet updater. Everything seemed to go well and I built and executed my application. When I tried to retrieve the first entity from the database, I received this error:...The property 'UpdatedDate' i...
asked by Sparafusile
Unable to find the requested .Net Framework Data Provider. It may not be installed
This morning I suddenly got this exception when trying to add a custom migration step to our EF Code-first migrations:...The ADO.NET provider with invariant name '.NET Framework Data Provider for SQL Server' is either not registered in the machine or appl...
asked by Jesper Lund Stocholm
EF6 Code First Pluralizing Tables Invalid Object Name
EF6 is pluralizing my Code First table names no matter what I do. I am getting the error that it can't find the pluralized table {"Invalid object name 'dbo.TestStats'."}. The table is singular in the DB as dbo.TestStat...I tried removing the convention by...
asked by Shiloh
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
Entity framework code first migration to multiple database
Lets say we have the architecture model of web application where we have 1 database per 1 account. Database structure is the same for these accounts and differs only on data with in. How can i configurate a migrations in code first model.
asked by Vitach
Page 1 of 12