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Entity Framework 6: How to find the primary key?

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Entity Framework 6: How to find the primary key?

San

San

8yAsked Feb 5, 2018, 1:10 AM2.2k.NET

How to find the primary key?

3 Replies

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El Mahdi Archane8y ago
Hi Sandeep,

We have 2 way to define primary key by using either primary key convention or Data Annotation.

- Primary key convention => By default, Entity Framework Creates a primary key if a property name is Id or Id.

- Data Annotation => The property should be decorated by using [Key] attribute.

I hope it will be helpfull for you.
0
Manav Pandya8y ago
Hello

By using entity framework you should define that which column gonna be primary key

For that you can use "Data Annotation"

Please find below snippet :
Public class Student
{
     [Key] // It will works as primary key
     public int StudentKey{get;set;}
}
Use namespace like :
using System.ComponentModel;
using System.ComponentModel.DataAnnotations;
using System.Web.Mvc;
If you don't provide key than it throws exception as well

Because EF Requires any key to be primary , by using [Key] you are telling that this column is going to be acts as primary key

I hope it helps

Thanks
0
Ramesh Palanivel8y ago
Hi Sandeep,

In your Entity Model class, if you have an Key with ModelName+Id it will take this as a primary key.

Please find the sample here,

Public class Student
{
public int StudentId{get;set;} //This is the primary key for your entity
}
+2