Entity Framework Core SaveChanges

Introduction

DbContext.SaveChanges method saves all changes made in this context to the database. You can add, modify, and remove data using your context and entity classes.

Add Data

You can use the DbSet.Add method to add new instances of your entity classes, and then when you call SaveChanges, it will insert data into the database.

using (var context = new MyContext())
{
    var customer = new Customer 
    { 
        FirstName = "Mark", 
        LastName = "Upston" 
    };

    context.Customers.Add(customer);
    context.SaveChanges();
}

Updating Data

When you made changes to any existing entity, or simply modify the values assigned to properties and then call SaveChanges, it will update the data into a database.

using (var context = new MyContext())
{
    var customer = context.Customers.FirstOrDefault();
    customer.LastName = "Andy";
    context.SaveChanges();
}

Deleting Data

You can use the DbSet.Remove method to delete instances of your entity classes. If the entity already exists in the database, it will be deleted during SaveChanges. If the entity has not yet been saved to the database, then it will be removed from the context and will no longer be inserted when SaveChanges is called.

using (var context = new MyContext())
{
    var customer = context.Customers.FirstOrDefault();
    context.Customers.Remove(customer);
    context.SaveChanges();
}