entity-framework-core

问题 After reading many questions here, on Asp.Net's Github (this one comes to mind, ServerFault and SoftwareEngineering, I have decided to ask a question of my own. The Problem Code-First Migrations make live incredibly easy during early development. Staging- or Production-Environments are harder to update, especially during the initial roll-outs which may require frequent updates. Updating the production DB is a lot harder, and automatic migrations are out of the question for a number of very

问题 I cant seem to figure out how to get EF Core to include / load related objects when using SelectMany. context.MyObject .Where(w => w.Id == Id) .SelectMany(m => m.SubObject) .Include(i => i.AnotherType) Would have thought something like the above would work, however the collapsed SubObject collection has the AnotherObject being null and not included. Been searching for hours. Any help would be appreciated. Thanks 回答1: Would have thought something like the above would work It used to work in

问题 I have written a simple application and when I navigate to my edit page the below error pops up. Microsoft.EntityFrameworkCore.Query[10100] An exception occurred while iterating over the results of a query for context type 'app.Models.ApplicationDbContext'. System.ObjectDisposedException: Cannot access a disposed object. A common cause of this error is disposing a context that was resolved from dependency injection and then later trying to use the same context instance elsewhere in your

问题 Scenario: I have received auto generated project in ASP.NET CORE from my colleague. There is auto-generated code for Account/Manage service. This code includes ApplicationUser Class, DBContext and migration folder with 00000000000000_CreateIdentitySchema.cs and 20180323155805_Snapshot.cs. I have been trying to change my User class to have integer id. To do that I added generic to IdentityUser: public class ApplicationUser : IdentityUser**<int>** { } I also had to create ApplicationRole class,

问题 I using asp.net vnext and ef7 when i want adding user i getting this error: A relational store has been configured without specifying either the DbConnection or connection string to use. What is this? Consider my app start: using DomainModels; using Microsoft.AspNet.Builder; using Microsoft.AspNet.Hosting; using Microsoft.AspNet.Routing; using Microsoft.Framework.ConfigurationModel; using Microsoft.Framework.DependencyInjection; using Presentation.DataAccessLayer.Context; using Microsoft

问题 I am unable to execute migration command in a class library package. My dnvm version is (from global.json): "sdk": { "version": "1.0.0-beta5-12021" } I'm importing this in my project JSON. "dependencies": { "EntityFramework.Commands": "7.0.0-beta4", "EntityFramework.SqlServer": "7.0.0-beta4", "Microsoft.CSharp": "4.0.0-beta-22816", "System.Collections": "4.0.10-beta-22816", "System.Linq": "4.0.0-beta-22816", "System.Threading": "4.0.10-beta-22816", "EntityFramework.Core": "7.0.0-beta4" },

问题 I am unable to execute migration command in a class library package. My dnvm version is (from global.json): "sdk": { "version": "1.0.0-beta5-12021" } I'm importing this in my project JSON. "dependencies": { "EntityFramework.Commands": "7.0.0-beta4", "EntityFramework.SqlServer": "7.0.0-beta4", "Microsoft.CSharp": "4.0.0-beta-22816", "System.Collections": "4.0.10-beta-22816", "System.Linq": "4.0.0-beta-22816", "System.Threading": "4.0.10-beta-22816", "EntityFramework.Core": "7.0.0-beta4" },

问题 Does anyone know of a way or have an implementation to apply ALL classes that derive from IEntityTypeConfiguration<> to the DbContext at runtime? There doesn't seem to be anything built in and loading each one manually via: protected override void OnModelCreating(ModelBuilder modelBuilder) { modelBuilder.ApplyConfiguration(new Table1Config()) modelBuilder.ApplyConfiguration(new Table2Config()) ... modelBuilder.ApplyConfiguration(new TableNConfig()) } is going to prove rather tedious for a

问题 Does anyone know of a way or have an implementation to apply ALL classes that derive from IEntityTypeConfiguration<> to the DbContext at runtime? There doesn't seem to be anything built in and loading each one manually via: protected override void OnModelCreating(ModelBuilder modelBuilder) { modelBuilder.ApplyConfiguration(new Table1Config()) modelBuilder.ApplyConfiguration(new Table2Config()) ... modelBuilder.ApplyConfiguration(new TableNConfig()) } is going to prove rather tedious for a

问题 I am currently developing an API with ASP.NET Core and Entity framework core with npgsql as database provider. I have two Entities and they have a one to many relation. The thing is that I only want to include the Id's of the child entity in the JSON result that the "Parent Controller" returns. These are my entities: public class Meal { public int Id { get; set; } public string Title { get; set; } public string Description { get; set; } public string UserId { get; set; } public User User {