/// <summary>
/// Adds entries to the audit models and returns the RecentUpdateDb. As SaveChanges call is required to commit the changes from the caller.
/// </summary>
/// <param name="changeTracker"></param>
/// <param name="userId"></param>
/// <returns></returns>
public AuditModelContext AuditChanges(DbChangeTracker changeTracker, string userId)
{
//Record changes into the Audit DB.
AuditModelContext recentUpdateDb = new AuditModelContext();
//Create an exclusion list for audit
string[] excludedFromAudit = new string[] { "ModifiedById", "Modified", "CreatedById", "Created" };
IEnumerable <DbEntityEntry> auditEntries = changeTracker.Entries().Where(x => x.Entity is BaseBaseModel && (x.State == EntityState.Modified));
foreach (DbEntityEntry entry in auditEntries)
{
if (entry.GetType().GetCustomAttribute(typeof(NoAuditAttribute)) == null)
{
var currentValues = entry.CurrentValues;
var databaseValues = entry.GetDatabaseValues();
if (currentValues != null)
{
foreach (string propertyName in currentValues.PropertyNames.Except(excludedFromAudit))
{
if (!string.IsNullOrWhiteSpace(propertyName))
{
var propertyValue = databaseValues.GetValue <object>(propertyName);
//Use nullPlaceholder for equals Operation.
object originalValue = propertyValue;
object currentValue = currentValues[propertyName];
//Audit changes and non-ReadOnly Fields.
if (entry.Entity.GetType().GetProperty(propertyName).GetCustomAttribute(typeof(TFOF.Areas.Core.Attributes.ReadOnlyAttribute)) == null)
{
recentUpdateDb.Add(
ObjectContext.GetObjectType(entry.Entity.GetType()).Name,
((BaseBaseModel)entry.Entity).GetPrimaryKey(),
propertyName,
originalValue,
currentValue,
userId
);
}
}
}
}
}
}
return(recentUpdateDb);
}
