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Home Forums How to update records using Entity Framework Core? – MindStick
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1 Answers

Aryan Kumar
Aryan Kumar 07 Jul 2023
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There are two ways to update records using Entity Framework Core:

  1. In a connected scenario, you can update an entity by retrieving it from the database, making the necessary changes, and then calling the SaveChanges() method.
  2. In a disconnected scenario, you can update an entity by first attaching it to the context, setting its state to Modified, and then calling the SaveChanges() method.

Here is an example of how to update an entity in a connected scenario:

C#

using Microsoft.EntityFrameworkCore;

namespace MyApp
{
    public class Program
    {
        public static void Main(string[] args)
        {
            // Create a DbContext instance.
            var context = new MyContext();

            // Retrieve the entity to update.
            var product = context.Products.Find(1);

            // Make the changes to the entity.
            product.Name = "New Product Name";

            // Save the changes.
            context.SaveChanges();
        }
    }
}

Here is an example of how to update an entity in a disconnected scenario:

C#

using Microsoft.EntityFrameworkCore;

namespace MyApp
{
    public class Program
    {
        public static void Main(string[] args)
        {
            // Create a DbContext instance.
            var context = new MyContext();

            // Retrieve the entity to update.
            var product = context.Products.Find(1);

            // Attach the entity to the context.
            context.Attach(product);

            // Set the entity's state to Modified.
            product.State = EntityState.Modified;

            // Save the changes.
            context.SaveChanges();
        }
    }
}

In both cases, the SaveChanges() method will update the entity in the database.

Here are some additional considerations when updating records using Entity Framework Core:

  • If you are updating a related entity, you will need to update the parent entity as well.
  • If you are updating a large number of records, you may want to use the BulkInsert() or BulkUpdate() methods instead of calling SaveChanges() multiple times.
  • You can use the Include() method to specify which properties of an entity you want to update. This can improve performance by reducing the amount of data that needs to be transferred between the database and the application.
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