How to Configure Precision and Scale for Decimal Data Types in EF Code First?

Configuring the precision and scale of decimal data types in EF Code First

In EF Code First, properties of type System.Decimal are mapped to columns of type decimal(18, 0) in the database by default. To maintain data integrity and ensure accuracy of numerical operations, it is critical to customize the precision (total number of digits stored) and scale (number of decimal places stored) of these columns.

Dave Van den Eynde's original answer suggested that in EF 4.0 and earlier the recommended way to adjust precision was to iterate over the properties and use modelBuilder.Entity().Property().HasPrecision() with modelBuilder. Entity().Property().HasScale(). However, this approach has been deprecated in recent EF versions.

Starting with EF 4.1, the DecimalPropertyConfiguration.HasPrecision method provides a simpler and more efficient solution. It accepts two parameters:

• precision: Specifies the total number of digits that the database will store, regardless of the position of the decimal point.
• scale: Specifies the number of decimal places that the database will store.

The syntax for setting precision and scale in EF Code First is as follows:

<code class="language-csharp">public class EFDbContext : DbContext
{
    protected override void OnModelCreating(System.Data.Entity.DbModelBuilder modelBuilder)
    {
        modelBuilder.Entity<MyClass>().Property(m => m.MyProperty).HasPrecision(12, 10);

        base.OnModelCreating(modelBuilder);
    }
}</code>

With this approach, we can explicitly define the precision and scale of decimal attributes, ensuring that the database column accurately represents the required data format and range. This is especially important when dealing with financial or other sensitive data that requires high accuracy.

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