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Entity Framework is not able to pull specific record by its ID in C# back end

By : Marcus Lucero
Date : September 14 2020, 09:00 PM
Hope this helps Lets say I have a table called Books, I have few records in that as shown below , you need to query table books. please change your query as below:
code :
var result = context.Books.Where(b => b.ID == 1).FistOrDefault();
var result = context.Books.FistOrDefault(b => b.ID == 1);

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How to retrieve a specific record using the entity framework

By : superstar shaik
Date : March 29 2020, 07:55 AM
will be helpful for those in need I am storing three values in a three column field (user name ,the hashed password and the user type) and I want to try and retrieve them later .How do I go about .Right now my code for storing the data is like this
code :
string myUsername = "MEMEMEME@here.com"

User me = dbcontext.Users.Single(u => u.username.ToLower() == myUsername.ToLower());

What is the simplest way to copy a record from one entity to another entity with Entity framework?

By : MTadder
Date : March 29 2020, 07:55 AM
I wish this help you One way to do this is to have 2 entity classes (one for the transaction table and one for the archive table) and use the AutoMapper to populate the archive object from the transactional object, and call the SaveChanges.

Entity Framework record is adding a new record instead of using existing record

Date : March 29 2020, 07:55 AM
should help you out First up, consider changing your field naming convention to avoid confusion. Where you have Product.ProductId, consider naming this Product.ProductNumber. I'd also consider using the same field name for the PK and FK (ProductId vs. Id). When your OrderDetail has a ProductId this is easily confused with your "ProductId" column on your Product entity.
As for the issue you are seeing: What is the source of the OrderDetail instance being operated against? Is it a New OrderDetail or one that was retrieved from EF? What is the source of the existing "Product" item referenced by this OrderDetail? (before your code here to find the Product in EF) Was it New'ed or pulled from EF?

Angular - can't access to a json-returned class specific value (angular 5, entity framework core with c# back-end)

By : Mohammed Modather
Date : March 29 2020, 07:55 AM
Hope this helps I answer to my own question.
The answer is just: "pay attention to uppercase".

Entity Framework 5 failure while adding a new record of a specific object

By : user2283746
Date : March 29 2020, 07:55 AM
Any of those help Pay attention to your context property it recreates dbcontext for each call so the context you add the entity is not the same as the one you call save changes Please manage dbcontext life cycle - preferably by using using statement
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