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ENTITY-FRAMEWORK QUESTIONS

How to delete an object by id with entity framework
How to delete an object by id with entity framework
this will help It seems to me that I have to retrieve an object before I delete it with entity framework like below , In Entity Framework 6 the delete action is Remove. Here is an example
TAG : entity-framework
Date : November 29 2020, 07:01 PM , By : user3856356
How to retrieve base class only (entity framework)?
How to retrieve base class only (entity framework)?
may help you . Yes this is a little tricky.But I did a tip on this a while back
TAG : entity-framework
Date : November 28 2020, 07:01 PM , By : Mill3niumThr33
How to add entity object to adequate entity set with object context in EF?
How to add entity object to adequate entity set with object context in EF?
I think the issue was by ths following , If you add an object to your ObjectContext and want to retrieve it without querying the database, you can use ObjectContext.GetObjectByKey.Your second question is unclear to me.
TAG : entity-framework
Date : November 24 2020, 07:00 PM , By : user3862815
One-way One to Many relationship using part of a composite key
One-way One to Many relationship using part of a composite key
With these it helps The foreign key on the second table must match the PK on the first.For example, using Int for the key type for simplicity.
TAG : entity-framework
Date : October 13 2020, 01:00 PM , By : Learner
Entity Framework: Left Join with List Result
Entity Framework: Left Join with List Result
help you fix your problem Shortly, it's not possible (and I don't think it ever will be). If you really want to control the exact server calls, EF Core is simply not for you. While EF Core still has issues with some LINQ query translation which leads
TAG : entity-framework
Date : October 11 2020, 06:00 AM , By : Walter Christie
LINQ - Conditional Join
LINQ - Conditional Join
fixed the issue. Will look into that further You can use the below code, with no need to use join or where statements on _context.Mapper:
TAG : entity-framework
Date : October 09 2020, 08:00 AM , By : Ming Luo
GroupJoin: exception thrown: System.InvalidOperationException
GroupJoin: exception thrown: System.InvalidOperationException
will help you Since the exception is by the EF Core infrastructure, apparently you are hitting current EF Core implementation bug.But you can help EF Core query translator (thus avoiding their bugs caused by missing use cases) by following some rules
TAG : entity-framework
Date : October 08 2020, 07:00 PM , By : Master Expert
EF Core 2.2 LINQ query not working in EF Core 3.0
EF Core 2.2 LINQ query not working in EF Core 3.0
I wish did fix the issue. This is due to one of the breaking changes in EF Core 3.0 and that is: LINQ queries are no longer evaluated on the clientSo write the query in such way that EF Core can convert the expression into T-SQL or fetch the data int
TAG : entity-framework
Date : October 01 2020, 03:00 PM , By : moe
Making tests faster by using only partial database in EntityFramework Effort
Making tests faster by using only partial database in EntityFramework Effort
Hope this helps Disclaimer: I'm the owner of the project Entity Framework EffortOur library has a feature that allows creating a restore point and rollbacking to it.
TAG : entity-framework
Date : September 28 2020, 02:00 AM , By : Siva Prashanth
Create Database Views using EF Core Code First approach
Create Database Views using EF Core Code First approach
Does that help As far as I know, you can't create views with EF Core directly. However, you can use migrations to execute arbitrary SQL when upgrading. Generate a migration in the package manager console, even if there is nothing really to do: add-mi
TAG : entity-framework
Date : September 27 2020, 11:00 PM , By : user6076793
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