Entity Framework Core - Knowledge Base (KB)
19 results in tag: asynchronous
Multi-async in Entity Framework 6?
This is my code:...var banner = context.Banners.ToListAsync() var newsGroup = context.NewsGroups.ToListAsync() await Task.WhenAll(banner, newsGroup); ...But when i called the function from controller. It showed error...A second operation started on this c...
asked by An Hv
EntityFramework Stored Proc Function Import is it possible to read async?
I'm using EF 6.1.1 and Database First. When I import a stored proc into the edmx and generate the DBContext it looks like this:...return ((IObjectContextAdapter)this).ObjectContext.ExecuteFunction<TestSP_Result>("TestSP", params[]...) ...That returns an O...
asked by oscarmorasu
Entity Framework SaveChanges Async
I am currently working on an audit trail feature and using the entity framework....the current code works but takes long time to run....public class MyDbContext : DbContext { public int SaveChanges() { // get changes from ChangeTracker.DetectChange...
asked by Milo Cabs
Asynchronously process entities as they are returned from the database engine
In EF 6, I would like to asynchronously process entities as they are returned from the database engine....I know I can call ...ToListAsync()... and ...ForEachAsync()... and perhaps they do what I'm looking for, but I'm not convinced. I think what I am lo...
asked by MikeJansen
why i cannot await 'System.Linq.IQueryable
I have the following repository method:-... public IQueryable<TSet> getAllScanEmailTo() { return t.TSets.Where(a=>a.Name.StartsWith("ScanEmail")); } ...which is being called as follow:-...var emailsTo = repository.getAllScanE...
asked by john Gu
How do I safely call an async method from EF's non-async SaveChanges?
I'm using ASP.NET Core, and EF Core which has ...SaveChanges... and ...SaveChangesAsync.......Before saving to the database, in my ...DbContext..., I perform some auditing/logging:...public async Task LogAndAuditAsync() { // do async stuff } public o...
asked by grokky
Entity Framework Core + SQlite. Async requests are actually synchronous
I have WPF program and I am trying to use EF Core with SQLite there and I found strange behaviour. Even if I call async method like ToArrayAsync() or SaveChangesAsync() it returns already completed task. So it means that operation was actually done synchr...
asked by Ivan Chepikov
Raise async event in EF's DbContext.SaveChangesAsync()
I'm using EF Core, in an ASP.NET Core environment. My context is registered in my DI container as per-request....I need to perform extra work before the context's ...SaveChanges()... or ...SaveChangesAsync()..., such as validation, auditing, dispatching n...
asked by grokky
.NetCore WebAPI methods Async or Not with EFCore query
What is considered best(or better) practice to have as default state and why, and what are the real benefits of either?... For example if we have ...Get... method in controller should it be:...public virtual IActionResult Get(int page = 1, int pageSize = ...
asked by borisdj
Deadlock on Linq to Entity Framework Core 2.0 Table
I'm getting what I think to be a deadlock when trying to run a bunch of linq queries in parallel....I am running a ...Task.WhenAll()... on this method:...public async Task<MetabuildScan> GetLatestMetabuildScanAsync(string buildId) { var metabuildScanS...
asked by Window
Why are queries that modify database data awaitable, while queries that only read data not?
I can asynchronously write new rows to the database:...await dbContext.Chatlogs.AddAsync(new ChatMessage(messageString, time, author)); await dbContext.SaveChangesAsync(); ...But what about just reading content from the databse?...string firstMessageEverP...
asked by gaazkam
Return multiple values from a C# asynchronous method
I have worked with asynchronous methods and the methods which return multiple values, separately. In this specific situation, following "GetTaskTypeAndId()" method should be asynchronous and should return multiple values at the same time. How should I mak...
asked by Kushan Randima
Entity Framework core 2.1 Using AsNoTracking with multiple Async gives InvalidOperationException: The connection was not closed
I have run two Async methods using Entity Framework 2.1 - one for selecting the total count and another for retrieving page data - and I marked my entity AsNoTracking as following:...var dbContext = new SamuraiAppDataCoreContext(); var query = dbContext....
asked by Mina Matta
How to check if Entity item was added in Async C# MVC Core method
I am writing my own implementation of IUserStore and IUserPasswordStore and I need to prepare async method ...CreateAsync... which will return ...IdentityResult.... So far I have this:... public async Task<IdentityResult> CreateAsync(User user) { ...
asked by RaV
How do I do an async query without enumerating the data?
I'm trying to work out how to write a generic async ...GetAll<T>... database method in Entity Framework Core without enumerating the data. I want ...GetAll<T>... to be async, but don't want it to enumerate the data, so that I can add a ...Where... method ...
asked by Avrohom Yisroel
How can I return IQueryable<TEntity> object from a mock object?
I am trying to tell a method ...GetAll()... on a mocked object ..._portalUserRepositoryMock... to return an object of type ...IQueryable<TEntity>.... I know it is of this type because the method in the class to be tested returns this type....I've not been...
asked by user54287
How to fix .Net Runtime unhandled exception
I had a function which I need to Refresh the data grid view. When I deploy the program it automatically close the program....I have a MSSQL Server in my side. I tried to fix my function several times but it only works fine in my environment....Here is my ...
asked by Nicko Rother M. Belir
Asynchronously saving to multiple tables in a single SQL Server Db
I was able to populate multiple tables of a database in parallel using Task.WhenAll(tasks). I have a generic method for each table:...var tasks = new List<Task>() { CheckNewItems<S, T>(async () => await GetPrimaryKeys<S, T>(), ...
asked by Practical Programmer
How to create an asynchronous repository with EF Core?
I'm trying to abstract EF Core with a repository and can't figure out how to make it asynchronous. This is the synchronous version:...public class UserRepository { private DbSet<User> users; public UserRepository(ApplicationDbContext context) ...
asked by Gur Galler
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