How to Update a Single Field (Password) in Entity Framework?

Using Entity Framework to update a single field

This article describes how to update a specific field (password) in the Users table using Entity Framework. Here is an improved version of the method provided by Ladislav:

1. Create entity object: Create an instance of the User class and set its Id and Password properties to the values ​​you want to update.

2. Open DbContext: Use the using block to create an instance of the MyEfContextName context class, making sure it releases resources correctly.

3. Additional entities: Call the Users method of the Attach DbSet, passing in the User object you created in step 1. This will add the entity to the context's change tracker, even if it was not originally queried.

4. Modify attributes: Use the Entry and Property methods to access the Password attribute and set its IsModified attribute to true. This tells EF that the value has changed and needs to be updated.

5. Save changes: Call the SaveChanges method on the context to persist changes to the database.

Here is the updated code:

public void ChangePassword(int userId, string password)
{
    var user = new User { Id = userId, Password = password };
    using (var db = new MyEfContextName())
    {
        db.Users.Attach(user);
        db.Entry(user).Property(x => x.Password).IsModified = true;
        db.SaveChanges();
    }
}

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