entity-framework-core

问题 I am trying to add a middleware so that transaction begins at the beginning of the request and commits or rollbacks depending on the situation. This is my middleware: public class TransactionPerRequestMiddleware { private readonly RequestDelegate next_; public TransactionPerRequestMiddleware(RequestDelegate next) { next_ = next; } public async Task Invoke(HttpContext context, AppDbContext dbContext) { var is_everything_ok = true; var transaction = dbContext.Database.BeginTransaction( System

问题 I have this UWP app that uses a project (UWP class library) which itself uses EF7 and SQLite. I tried to build the app in the Release mode using .Net native tool chain, the build completes successfully (after a good long time, and after eating as much memory as it can), but the application crashes just after leaving the splash screen. After following some advice on SO I tried the .Net native with Debug mode, the build finishes just like in the Release mode, but I get many errors on the output

问题 I have a Repository using EF Core. In the below scenario I first fetch an entity along with a related child collection. I then remove all the children and add a new child and also update one property on the parent entity. After saving the property on the parent is update, the new child entity is added but all the original child entities are still in the database. How can I get EF to track the removed child entities as deleted? class Repository { public Parent GetParent(int id) { using (var db

问题 I'm trying to get "EntityFramework. SQLite ": "7.0.0-beta1" to work within ASP.NET 5. I've created my project using Yeoman and installed EF sqlite from the package manager. The project builds fine but when running I get: Could not load file or assembly 'Microsoft.Framework.Logging.ILogger, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null'or one of its dependencies. My project.json: "dependencies": { "Microsoft.AspNet.Diagnostics": "1.0.0-beta5", "Microsoft.AspNet.Mvc": "6.0.0-beta5",

问题 I have an ASP .Net Core 2.1 Web Api. I was wondering if there is an "elegant solution" for constructing filters on my DbContext based on query strings? So... say I have one [optional] query string: // GET: api/Accounts [HttpGet] public IEnumerable<File> GetAccount([FromQuery] bool? isActive) { if (isActive.HasValue) return _context.Accounts.Where(a => a.IsActive == isActive.Value); else return _context.Accounts; } Simple enough... But say I have a number of (optional) query strings: // GET:

问题 I have the following method which is meant to build me up a single object instance, where its properties are built via recursively calling the same method: public ChannelObjectModel GetChannelObject(Guid id, Guid crmId) { var result = (from channelObject in _channelObjectRepository.Get(x => x.Id == id) select new ChannelObjectModel { Id = channelObject.Id, Name = channelObject.Name, ChannelId = channelObject.ChannelId, ParentObjectId = channelObject.ParentObjectId, TypeId = channelObject

问题 I'm starting to understand the naming conventions for the .NET stack cross-platform. Particularly this page explained it well: http://blog.tonysneed.com/2016/01/22/ef6-asp-net-core-mvc6/ I'm starting a personal project which will be completely greenfield and see it as an opportunity to learn all these new technologies. However, I want to re-use code from other MVC5 applications that use well known libraries. Especially for the infrastructure & plumbing I used some well-known libraries such as

问题 In Entity Framework 7, there is DbSet.FromSql , which seems to me that allows to create IQueryable<> from raw SQL. According to the doc: Raw SQL queries provides the DbSet.FromSql method to use raw SQL queries to fetch data. These queries can also be composed on using LINQ. How to implement something similar in old LINQ to SQL? 来源： https://stackoverflow.com/questions/32144330/iqueryablet-from-raw-sql

问题 A common setup with Docker: Two linux containers, one a .NET Core WebServer using EntityFramework Core 2.2.6, the other a MS-SQLServer 2017. Persistent data is being held in a Docker volume. Using docker-compose , it's not a swarm. When starting the SQLServer container, one must provide the SA password as an environment variable to the container. However you provide that, it is possible to later read this env from outside the container using docker container inspect . Which obviously

问题 I keep getting NullReferenceException trying to iterate over a null entry on a row. public class Person { public int ID { get; set; } public string Name { get; set; } public Address Address { get; set; } public int AddressID { get; set; } } public class Address { public int ID { get; set; } public string FirstLine { get; set; } public string SecondLine { get; set; } } With the default scaffold template, _context.Person.Include(c => c.Address); The view works fine if there is an address or not