How do I update a property in my entity entity framework

Question

0.00/5 (No votes)

See more:

Hi Guys

I am currently having an issue with the following.

I am using the entity framework with mvc and i am trying to save some data according to the model.

So this is the process that currently takes place from a user perspective
Users create a record
Save a record
and have the ability to copy the record with one or two updates and save as a new record.

Issue i am having is when they try to save the first record there is a method which generates the key for the record, the record saves with no issues. if the user tries to copy and save once the key is generated and i try to add the record i am getting the following error "The property is part of the object's key information and cannot be modified"

What I have tried:

This is my current code

C#

public void Add(Customer entity)
        {
            
            if (entity.PortalId == new Guid("{00000000-0000-0000-0000-000000000000}"))
            {
         
                entity.PortalId = Guid.NewGuid();
            }
            this.DbContext.Suppliers.Add(entity);
         
        }

Posted 13-Sep-16 21:53pm

IsiR_19

Updated 13-Sep-16 22:06pm

Add a Solution

Comments

johannesnestler 14-Sep-16 9:37am

let the database generate your key! - so this problem will resolve itself, or remove the key Attribute (or convention) from your model-Code (not recommend that) and handle the keys on your own - but again: DONT!

johannesnestler 15-Sep-16 10:17am

but why don't you let the database generate the key?

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

sifiso.m · Accepted Answer · 2016-09-13T22:06:00

Solution 1

Try removing the if statement and just generate a new ID.

Posted 13-Sep-16 22:06pm

sifiso.m

Comments

IsiR_19 14-Sep-16 4:25am

The new id is generated and updated before the add

sifiso.m 14-Sep-16 4:28am

Before you add.

entity.PortalId = Guid.NewGuid();
this.DbContext.Suppliers.Add(entity);

should work.

IsiR_19 14-Sep-16 4:48am

have tried it and still giving me the same error