private Task OnAfterSaveChanges(List <AuditEntry> auditEntries)
{
if (auditEntries == null || auditEntries.Count == 0)
{
return(Task.CompletedTask);
}
foreach (var auditEntry in auditEntries)
{
// Get the final value of the temporary properties
foreach (var prop in auditEntry.TemporaryProperties)
{
if (prop.Metadata.IsPrimaryKey())
{
auditEntry.KeyValues[prop.Metadata.Name] = prop.CurrentValue;
}
else
{
auditEntry.NewValues[prop.Metadata.Name] = prop.CurrentValue;
}
}
// Save the Audit entry
TblAudit.Add(auditEntry.ToAudit());
}
return(SaveChangesAsync());
}
public TblAudit ToAudit()
{
var audit = new TblAudit
{
TableName = TableName,
DateTime = DateTime.UtcNow,
Action = Action,
UserId = UserId,
KeyValues = KeyValues.First().Value.ToString(),
OldValues = OldValues.Count == 0 ? null : JsonConvert.SerializeObject(OldValues),
NewValues = NewValues.Count == 0 ? null : JsonConvert.SerializeObject(NewValues),
};
List <AuditDelta> DeltaList = new List <AuditDelta>();
JObject sourceJObject = JsonConvert.DeserializeObject <JObject>(audit.OldValues);
if (audit.Action == "Modified")
{
JObject targetJObject = JsonConvert.DeserializeObject <JObject>(audit.NewValues);
foreach (KeyValuePair <string, JToken> sourceProperty in sourceJObject)
{
JProperty targetProp = targetJObject.Property(sourceProperty.Key);
if (!JToken.DeepEquals(sourceProperty.Value, targetProp.Value))
{
AuditDelta delta = new AuditDelta
{
FieldName = sourceProperty.Key,
ValueBefore = Convert.ToString(sourceProperty.Value),
ValueAfter = Convert.ToString(targetProp.Value)
};
DeltaList.Add(delta);
}
}
}
else
{
foreach (KeyValuePair <string, JToken> sourceProperty in sourceJObject)
{
AuditDelta delta = new AuditDelta
{
FieldName = sourceProperty.Key,
ValueBefore = Convert.ToString(sourceProperty.Value),
ValueAfter = string.Empty
};
DeltaList.Add(delta);
}
}
audit.Changes = JsonConvert.SerializeObject(DeltaList);
return(audit);
}
private List <AuditEntry> OnBeforeSaveChanges()
{
ChangeTracker.DetectChanges();
var auditEntries = new List <AuditEntry>();
foreach (var entry in ChangeTracker.Entries())
{
if (IsAuditDisabled(entry))
{
continue;
}
var auditEntry = new AuditEntry(entry)
{
TableName = entry.Metadata.Relational().TableName
};
auditEntries.Add(auditEntry);
foreach (var property in entry.Properties)
{
if (property.IsTemporary)
{
// value will be generated by the database, get the value after saving
auditEntry.TemporaryProperties.Add(property);
continue;
}
string propertyName = property.Metadata.Name;
if (property.Metadata.IsPrimaryKey())
{
auditEntry.KeyValues[propertyName] = property.CurrentValue;
continue;
}
switch (entry.State)
{
//case EntityState.Added:
// auditEntry.NewValues[propertyName] = property.CurrentValue;
// break;
case EntityState.Deleted:
auditEntry.OldValues[propertyName] = property.OriginalValue;
auditEntry.Action = "Deleted";
auditEntry.UserId = CommonHelper.UserId;
break;
case EntityState.Modified:
if (property.IsModified)
{
auditEntry.Action = "Modified";
auditEntry.OldValues[propertyName] = entry.GetDatabaseValues().GetValue <object>(propertyName);
auditEntry.NewValues[propertyName] = property.CurrentValue;
auditEntry.UserId = CommonHelper.UserId;
}
break;
}
}
}
// Save audit entities that have all the modifications
foreach (var auditEntry in auditEntries.Where(_ => !_.HasTemporaryProperties))
{
TblAudit.Add(auditEntry.ToAudit());
}
// keep a list of entries where the value of some properties are unknown at this step
return(auditEntries.Where(_ => _.HasTemporaryProperties).ToList());
}
