Entity Framework AuditDbContext
Definition
AuditDbContext provides entity change auditing for Entity Framework POCO entities. It lets you easily implement change auditing on your application entities.
Instead of using Entity Frameworks DbContext you derive your context from AuditDbContext, which will automatically write change audit records to the database for the registered audit types whenever SaveChanges is called.
Implementation
Implement IAuditableEntity on your entity, or use the AuditableEntity base class.
public class Customer : AuditableEntity { public virtual int CustomerId { get; protected set; } public virtual string CustomerName { get; set; } }
Define an audit history entity implementing IAuditEntity, or use the AuditEntry base class.
public class CustomerAudit : AuditEntity { public virtual int CustomerAuditId { get; protected set; } public virtual int CustomerId { get; private set; } public virtual string CustomerName { get; set; } }
Derive you context from AuditDbContext.
public class Context : AuditDbContext { public IDbSet<Customer> Customers { get; set; } public IDbSet<CustomerAudit> CustomerAudits { get; set; } public Context(string conn) : base(conn) { } }
Register the audit types either through app.config. Add each of you auditable classes with their audit entity to the config file.
<configSections> <section name="entityFramework.Audit" type="EntityFramework.Auditing.AuditConfigurationSection, EntityFramework.Auditing" /> </configSections> <entityFramework.Audit> <entities> <add name="EntityFramework.Auditing.Test.Customer, EntityFramework.Auditing.Test" audit="EntityFramework.Auditing.Test.CustomerAudit, EntityFramework.Auditing.Test" /> </entities> </entityFramework.Audit>
You can also register the audit entities in code using the AuditDbContext.RegisterAuditType method.
AuditDbContext.RegisterAuditType(typeof(Customer), typeof(CustomerAudit));
Requirements
Entity Framework Version
- Entity Framework 6.x
