CreatedOn column in Entity Framework 6

CreatedOn column in Entity Framework 6

You can add a CreatedOn column to an entity in Entity Framework 6 by following these steps:

  • Add a CreatedOn property to your entity:
public class MyEntity { public int Id { get; set; } public string Name { get; set; } public DateTime CreatedOn { get; set; } }
  • In your DbContext class, override the SaveChanges method to automatically set the CreatedOn property for any new entities:
public override int SaveChanges() { var entries = ChangeTracker.Entries() .Where(e => e.Entity is MyEntity && (e.State == EntityState.Added)); foreach (var entry in entries) { ((MyEntity)entry.Entity).CreatedOn = DateTime.UtcNow; } return base.SaveChanges(); }

This code gets all new entities of type MyEntity and sets their CreatedOn property to the current UTC time.

  • You may also want to set the CreatedOn column as a database generated column, so that the database automatically generates a value for it when a new row is inserted. To do this, you can use the DatabaseGenerated attribute on the CreatedOn property:
public class MyEntity { public int Id { get; set; } public string Name { get; set; } [DatabaseGenerated(DatabaseGeneratedOption.Computed)] public DateTime CreatedOn { get; set; } }

This code tells Entity Framework that the CreatedOn column should be computed by the database.

With these steps, you can easily add a CreatedOn column to your entity in Entity Framework 6.

Examples

  1. How to add a CreatedOn column in Entity Framework 6?

    • Description: This query seeks information on adding a CreatedOn column to an entity in Entity Framework 6.
    • Implementation: Add a DateTime property to your entity and set its value during entity creation.
    public class YourEntity { public int Id { get; set; } // Other properties public DateTime CreatedOn { get; set; } = DateTime.Now; }

  2. Entity Framework 6 Code First CreatedOn column with default value

    • Description: This query focuses on creating a Code First entity in Entity Framework 6 with a CreatedOn column and a default value.
    • Implementation: Use a default value in the entity's constructor.
    public class YourEntity { public YourEntity() { CreatedOn = DateTime.Now; } public int Id { get; set; } // Other properties public DateTime CreatedOn { get; set; } }

  3. Entity Framework 6 CreatedOn column with DatabaseGeneratedOption.Identity

    • Description: This query explores using DatabaseGeneratedOption.Identity for a CreatedOn column in Entity Framework 6.
    • Implementation: Decorate the CreatedOn property with the DatabaseGenerated attribute.
    public class YourEntity { [DatabaseGenerated(DatabaseGeneratedOption.Identity)] public DateTime CreatedOn { get; set; } // Other properties }

  4. Entity Framework 6 CreatedOn column with Fluent API configuration

    • Description: This query aims to find information on configuring a CreatedOn column using Fluent API in Entity Framework 6.
    • Implementation: Use the HasDatabaseGeneratedOption method in the EntityTypeConfiguration.
    public class YourEntityConfiguration : EntityTypeConfiguration<YourEntity> { public YourEntityConfiguration() { Property(e => e.CreatedOn) .HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity); // Other configurations } }

  5. Entity Framework 6 CreatedOn column with attribute mapping

    • Description: This query focuses on using attribute mapping for a CreatedOn column in Entity Framework 6.
    • Implementation: Use the Column attribute for the CreatedOn property.
    public class YourEntity { [Column(TypeName = "datetime2")] public DateTime CreatedOn { get; set; } // Other properties }

  6. Entity Framework 6 Code First CreatedOn column with custom default value

    • Description: This query explores setting a custom default value for a CreatedOn column in Entity Framework 6 Code First.
    • Implementation: Set a custom default value in the entity's constructor.
    public class YourEntity { public YourEntity() { CreatedOn = DateTime.UtcNow; } public int Id { get; set; } // Other properties public DateTime CreatedOn { get; set; } }

  7. Entity Framework 6 CreatedOn column with UTC time

    • Description: This query seeks information on using UTC time for a CreatedOn column in Entity Framework 6.
    • Implementation: Set the CreatedOn property using DateTime.UtcNow.
    public class YourEntity { public int Id { get; set; } // Other properties public DateTime CreatedOn { get; set; } = DateTime.UtcNow; }

  8. Entity Framework 6 CreatedOn column with DateTime2 precision

    • Description: This query focuses on configuring the precision of a CreatedOn column as DateTime2 in Entity Framework 6.
    • Implementation: Use the HasColumnType method in the EntityTypeConfiguration.
    public class YourEntityConfiguration : EntityTypeConfiguration<YourEntity> { public YourEntityConfiguration() { Property(e => e.CreatedOn) .HasColumnType("datetime2"); // Other configurations } }

  9. How to make CreatedOn column nullable in Entity Framework 6?

    • Description: This query aims to find information on making a CreatedOn column nullable in Entity Framework 6.
    • Implementation: Allow the CreatedOn property to be nullable.
    public class YourEntity { public int Id { get; set; } // Other properties public DateTime? CreatedOn { get; set; } }

  10. Entity Framework 6 CreatedOn column with custom database default value

    • Description: This query explores setting a custom default value in the database for a CreatedOn column in Entity Framework 6.
    • Implementation: Use the DatabaseGeneratedOption.Computed and DatabaseDefaultValueSql attributes.
    public class YourEntity { [DatabaseGenerated(DatabaseGeneratedOption.Computed)] [DatabaseDefaultValueSql("GETUTCDATE()")] public DateTime CreatedOn { get; set; } // Other properties }

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