entity-framework-core

问题 In EF Core 2.2 I had: var data = await _ArticleTranslationRepository.DbSet .Include(arttrans => arttrans.Article) .ThenInclude(art => art.Category) .Where(trans => trans.Article != null && trans.Article.Category != null && trans.Article.Category.Id == categoryId.Value) .GroupBy(trans => trans.ArticleId) .Select(g => new { ArticleId = g.Key, TransInPreferredLang = g.OrderByDescending(trans => trans.LanguageId == lang).ThenByDescending(trans => trans.LanguageId == defaultSiteLanguage).ThenBy

问题 It is an UWP application using a SQLite database. Below, the dependencies for this application: { "dependencies": { "Microsoft.EntityFrameworkCore.Sqlite": "1.0.1", "Microsoft.EntityFrameworkCore.Tools": "1.0.0-preview2-final", "Microsoft.NETCore.UniversalWindowsPlatform": "5.2.2", "Microsoft.Xaml.Behaviors.Uwp.Managed": "1.1.0", "Newtonsoft.Json": "8.0.3", "Template10": "1.1.*" }, // ... } The requirement is: " [...]to have a password to access the database either from the application or any

问题 This question already has answers here : Entity Framework Core thread safe? (1 answer) Is DbContext thread safe? (3 answers) Entity Framework Thread Safety (3 answers) Closed 18 days ago . I'm migrating from netcoreapp 2.1 to 3.1, and I've found a breaking change for EF core 3.1 that I can't resolve. Previously in 2.1, this worked: taskList.Add(MethodOne(myRequestObject)); taskList.Add(MethodTwo(myRequestObject)); await Task.WhenAll(taskList); where both methods only read(never changed) from

问题 This question already has answers here : Entity Framework Core thread safe? (1 answer) Is DbContext thread safe? (3 answers) Entity Framework Thread Safety (3 answers) Closed 18 days ago . I'm migrating from netcoreapp 2.1 to 3.1, and I've found a breaking change for EF core 3.1 that I can't resolve. Previously in 2.1, this worked: taskList.Add(MethodOne(myRequestObject)); taskList.Add(MethodTwo(myRequestObject)); await Task.WhenAll(taskList); where both methods only read(never changed) from

问题 Consider the following class. It tries to protect the access to the _assignedTrays . Actually, it works perfectly, since EF automatically links the backing field _assignedTrays to the property AssignedTrays - by convention (msdn) public class Rack { private List<Tray> _assignedTrays = new List<Tray>(); private Rack() { } public Rack(string rackId) { this.Id = rackId; } public string Id { get; private set; } public IReadOnlyList<Tray> AssignedTrays => this._assignedTrays.AsReadOnly(); public

问题 Consider the following class. It tries to protect the access to the _assignedTrays . Actually, it works perfectly, since EF automatically links the backing field _assignedTrays to the property AssignedTrays - by convention (msdn) public class Rack { private List<Tray> _assignedTrays = new List<Tray>(); private Rack() { } public Rack(string rackId) { this.Id = rackId; } public string Id { get; private set; } public IReadOnlyList<Tray> AssignedTrays => this._assignedTrays.AsReadOnly(); public

问题 I am unable to run EntityFramework Core commands against the basic .NET Core 2.2 Web API I created. The API is working, but I can not 'add-migration' or 'update-database' unless I change where the connection string is retrieved. I believe the first example is best practice because the connection string is more secure, but I get an error when trying to run EF Core commands. "No database provider has been configured for this DbContext. A provider can be configured by overriding the DbContext

问题 When I run Scaffold-DbContext "Filename=mydatabase.sqlite3" Microsoft.EntityFrameworkCore.Sqlite I get an empty context using Microsoft.EntityFrameworkCore; using Microsoft.EntityFrameworkCore.Metadata; namespace MyNamespace { public partial class mydatabaseContext : DbContext { protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder) { optionsBuilder.UseSqlite(@"Filename=mydatabse.sqlite3"); } protected override void OnModelCreating(ModelBuilder modelBuilder) { } } } Am

问题 When I run Scaffold-DbContext "Filename=mydatabase.sqlite3" Microsoft.EntityFrameworkCore.Sqlite I get an empty context using Microsoft.EntityFrameworkCore; using Microsoft.EntityFrameworkCore.Metadata; namespace MyNamespace { public partial class mydatabaseContext : DbContext { protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder) { optionsBuilder.UseSqlite(@"Filename=mydatabse.sqlite3"); } protected override void OnModelCreating(ModelBuilder modelBuilder) { } } } Am

问题 I am using Entity Framework Core 3 Preview 5 and ASP.NET Core 3 Preview 5. In my Debug Output Window of Visual Studio 2019 I get no logs from EF Core. I read the documentation, but after that I am even more confused: According to https://docs.microsoft.com/en-us/dotnet/api/microsoft.entityframeworkcore.dbcontextoptionsbuilder.useloggerfactory?view=efcore-2.1 logging should be setup automatically: There is no need to call this method when using one of the 'AddDbContext' methods. 'AddDbContext'