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Utpal Vishwas

Utpal Vishwas

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I am Utpal Vishwas from Uttar Pradesh. Have completed my B. Tech. course from MNNIT campus Prayagraj in 2022. I have good knowledge of computer networking.

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Aryan Kumar

Aryan Kumar

22-Oct-2023

In .NET Core, the Seed method in migrations serves a crucial purpose when working with Entity Framework Core and database migrations. Its primary role is to populate the database with initial or default data. Here's a simplified explanation of why it's essential:

Imagine you've created a new database for your application using Entity Framework Core, and you have defined a data model for your tables. After you run your initial migration and create the database, it's often necessary to insert some default data into specific tables, like user roles, system settings, or reference data.

The Seed method allows you to define what data should be inserted into these tables during the database creation or migration process. This way, when your application starts using the database, it has the necessary initial data to function correctly.

For example, you might want to seed an "Admin" user into the User table with a predefined password or set default configuration settings for your application.

Here's a simplified code snippet to demonstrate how you might use the Seed method:

protected override void OnModelCreating(ModelBuilder modelBuilder)
{
    // Define your data model and relationships here
    
    // Seed initial data
    modelBuilder.Entity<User>().HasData(
        new User { Id = 1, UserName = "Admin", PasswordHash = "hashed_password" }
    );
    modelBuilder.Entity<Setting>().HasData(
        new Setting { Id = 1, Key = "DefaultSetting", Value = "InitialValue" }
    );
}

In this way, the Seed method ensures that your database starts with the necessary data, making your application more robust and user-friendly right from the beginning.

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