ef-code-first

问题 I am using EF code first method in my project. Recently I updated EF version of my project to EF 6 using Package Manager Console. All of my entities are inherited from a BaseEntity class as a super class : public abstract class BaseEntity { public virtual int Id { get; set; } States _state; [NotMapped] public States State { get; set;} public enum States { Unchanged, Added, Modified, Deleted } .... } And also I don't add the BaseEntity in my DbContext , the program run without any problem, but

问题 I am trying to reverse engineer an existing database using Entity Framework Core . I tried to follow the directions from Microsoft but I am presented with the error: Unable to find provider assembly with name EntityFramework. Ensure the specified name is correct and is referenced by the project. I am running the following command from the project directory: dnx ef dbcontext scaffold "Server=REMOVED;Database=REMOVED;User ID=REMOVED;Password=REMOVED" EntityFramework What am I doing wrong? 回答1:

问题 Hi I have developed model that works perfectly for me, now I want to map it to database using EntityFramework, here is a part of it: public class Product { public int Id { get; set; } public string Name { get; set; } public virtual ProductType Type { get; set; } } public class Supplier { public int Id { get; set; } public string OIB { get; set; } public string Name { get; set; } } public class SupplierProduct { public double Price { get; set; } public string SupplierMark { get; set; } public

问题 In an entity I have following declaration: Default Property Item(key As String) As String Because Entity Framework doesn't like indexed properties I've tried to ignore it: Public Class EntityMap Inherits EntityTypeConfiguration(Of EntityMap) Public Sub New() ' Me.Ignore(Function(x) x.Item()) --- Missing index parameter, compiler error ' Me.Ignore(Function(x) x.Item(String.Empty)) --- Gives runtime error End Sub End Class I've also tried to remove all discovery conventions from modelBuilder so

问题 I have a many to many EF map similar to the example below. I am using EF code first approach so my mapping class inherits EntityTypeConfiguration<>. this.HasMany(a => a.KPIs) .WithMany() .Map(a => { a.ToTable("KeyResultArea_KeyPerformanceIndicator_Mapping"); a.MapLeftKey("KRA_Id"); a.MapRightKey("KPI_Id"); }); As a result of this im left with the schema shown below. No great surprises so far. - However I would like to be able to soft delete one of these mappings so my desired schema would

问题 I have a problem With Entity Framework and TPC Inheritance With Self-Referencing Child Class. My Class definitions: Public Class BaseObject <Key()> <DatabaseGenerated(DatabaseGeneratedOption.None)> Public Overridable Property iId As Integer <Required()> Public Property iModUserId As Integer <ForeignKey("iModUserId")> Public Property ModUser As User <Required()> Public Property dtModDate As DateTime End Class Public Class User Inherits BaseObject <Required()> Public Property sFirstName As

问题 I have a application using code first; in search section I have to gather information from 3 tables and their related tables so I made a view; and since there is no syntax for code first to create view (I think so; please let me know if I'm wrong) I used pure SQL script; on model creating to prevent EF to create a table with same name as table (VIEW_SEARCH) I did : protected override void OnModelCreating(DbModelBuilder modelBuilder) { modelBuilder.Ignore<View_Search>(); } any ways application

问题 I'm running Entity Freamework Code First Migrations. When trying to run the application I get the error: A column ID occurred more than once in the specification. I have AutomaticMigrationsEnabled set to true in the configuration because when I run the project, I want the migrations to run automatically. This is the verbose results when I tried running it through the package manager: Applying code-based migration: 201211261626569_AddActiveFlagForProjects. ALTER TABLE [Projects] ADD [Active]

问题 I've been using Code First approach. I created a sql express local database "Database.mdf" in Visual Studio 2010 SP1 using MVC 4 template. When I try to run my project at my PC, I get an error: CREATE DATABASE permission denied in database master. Cannot attach the file "...Database.mdf" as database file "Database". What I've tried: deletion my database using SQL SERVER Object explorer(no results, the same error) change connection string (no result, the same error) googled in the Internet.

问题 Is there an easy solution for the following situation: I've got an Entity Dossier which is shared in 2 DbContexts . Dossier has 2 navigation properties, DossierType and DossierAttachment Dossier Dossier --> DossierType (Navigation Property) Dossier --> DossierAttachment (Navigation Property) I want to exclude the DossierType Entity in DbContext1 . I do not want it to be savable to database, navigation properties should not be set. I was expecting that calling modelBuilder.Ignore<DossierType>(