Entity Framework Paging

Adding existing entities to a collection on a newly built object using the entity framework

"Attach" is not permitted since the order has not yet been stored. By using "Add," you may instruct Entity Framework to add a new contact. Therefore, you are only left with one choice. The contact has to be loaded....The quickest approach to achieve it is as follows:...OrderDetails context = new OrderDetails(); Contact contact = context.GetObjectBy...

LINQ to Entities only supports casting in the Entity Framework. basic kinds in the Entity Data Model

I'm aware that this post is outdated, but I wanted to achieve the same goal as the OP and didn't want to utilize the...Func<IQueryable<T>, IOrderedQueryable<T>>... my dictionary says. mostly because I would need to utilize both an...OrderBy... and ...OrderByDescending... delegate....In the end, I developed an IQueryable extension method I've name...

Select * from Entities where Id = (select max(Id) from Entities) in Entity Framework

The Id column is a main key and indexed, therefore this should be performant from a simplicity standpoint since it doesn't need two round trips via EF to the SQL server. You always want to run queries as few times as possible for latency....using(var db = new DataContext()) { var maxEntity = db.Entities.OrderByDecending(x=>x.Id).FirstOrDefault() } ...

Dynamically query entities from Entity Framework for association to primary Entity

We've spoken extensively about how to obtain the...metadata... beyond the...DbContext... . These links can help you get started. I'll also make a few more specific remarks....How can I programmatically read the info from an EF DbContext?...A brief synopsis (but be sure you visit there for more) is as follows:...using (var db = new MyDbContext()) { ...

Entity Framework 6 Batch Updates and AuditLog using Entity Framework Extended

You must make the Auditor available....var auditConfiguration = AuditConfiguration.Default; auditConfiguration.IncludeRelationships = true; auditConfiguration.LoadRelationships = true; auditConfiguration.DefaultAuditable = true; ...simply include it where your app is initially launched. For instance, Global.asax.cs...edited...As far as I'm aware, E...

Oracle ODP.Net With Entity Framework 6 - Entity framework database compatible provider could not be found

To add to that, despite my best efforts, the problem in my case was resolved by setting the "...defaultConnectionFactory..." as follows:...<entityFramework> <defaultConnectionFactory type="Oracle.ManagedDataAccess.EntityFramework.OracleConnectionFactory, Oracle.ManagedDataAccess.EntityFramework"> </defaultConnectionFactory> <providers> <provider ...

Entity Framework 6.1.3 and SQL Server CE 4.0 - No Entity Framework provider found

The DDEX provider is installed for you by the SQL Server Compact Toolbox, which you must install on the new development machine. (You might need to open the Toolbox's About screen, click the DDEX install button, and then restart Visual Studio.)

Entity Framework - Updating entity with added/modified child and grandchild entities

Yes, you must take that action....When you complete everything inside a...DbContext... scope it takes care to keep track of all entity changes, and you don't need to do anything to inform the DbContext of the changes....However, with multi-layered systems, you cannot keep the entities inside a layer when you move them between them....DbContext... Y...

ADO.NET Entity Framework - Oracle with Entity Framework 6

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Entity Framework 6 vs Entity Framework Core Raw Sql

When there is just one table, I have done the "fromsql" right off of the context; however, I recognise that this is not what you want, even if it advances the cause....var blogs = context.Blogs .FromSql("SELECT * FROM dbo.Blogs") .ToList(); ...But in a situation like yours, it is complicated and involves the combining of many tables and CTE...