How to Control Precision and Scale of Decimal Values in EF Code First?

Managing Decimal Precision and Scale with EF Code First

Entity Framework (EF) Code First defaults to mapping System.Decimal properties to SQL Server decimal(18, 0) columns. This default might not always be ideal, particularly when your application requires higher precision or a greater number of decimal places. Fortunately, the EF API offers straightforward methods to customize this mapping.

Configuring Precision and Scale

Before EF 4.1, developers typically used the HasColumnType method to adjust column properties within a model iteration loop. For instance:

foreach (var property in modelBuilder.Properties.Where(p => p.ClrType == typeof(decimal)))
{
    property.HasColumnType($"decimal({property.Precision}, {property.Scale})");
}

However, EF 4.1 and later versions provide a more streamlined approach using the HasPrecision method. This method, part of the DecimalPropertyConfiguration, directly sets precision and scale.

• Precision: The total number of digits stored (before and after the decimal point).
• Scale: The number of digits stored after the decimal point.

Here's how to use HasPrecision:

modelBuilder.Entity<MyClass>().Property(o => o.MyDecimalProperty).HasPrecision(12, 10);

This code creates a SQL Server column with precision 12 and scale 10 for the MyDecimalProperty property within the MyClass entity.

This method ensures accurate and reliable data handling in your EF Code First applications by allowing precise control over decimal storage in the database.

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