How Can I Control Precision and Scale for Decimal Properties in EF Code First?

Fine-tuning Decimal Precision and Scale in EF Code First

Entity Framework (EF) Code First defaults to decimal(18, 0) for System.Decimal properties when mapping to SQL Server. However, you often need more control over precision and scale. Older methods involving direct EntityPropertyConfiguration manipulation are now obsolete, superseded by a more streamlined approach in EF 4.1 and later.

Leveraging DecimalPropertyConfiguration.HasPrecision

The DecimalPropertyConfiguration class provides the HasPrecision method for precise control. Its syntax is:

public DecimalPropertyConfiguration HasPrecision(byte precision, byte scale)

• precision: The total number of digits (before and after the decimal point).
• scale: The number of digits after the decimal point.

Practical Example: Setting Precision and Scale

Within your DbContext class's OnModelCreating method, you can specify precision and scale:

public class EFDbContext : DbContext
{
    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        modelBuilder.Entity<MyClass>().Property(e => e.MyDecimalProperty).HasPrecision(12, 10);

        base.OnModelCreating(modelBuilder);
    }
}

This maps MyDecimalProperty (of type decimal) in the MyClass entity to a SQL Server decimal(12, 10) column. This ensures the database stores numbers with a maximum of 12 digits, with up to 10 decimal places.

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