Scenario: User wants to see audit trail of record in email for some particular account notifications.

Solution : Custom ribbon button calls plugin(I am only posting code relevant to retrieve Audit Logs) which has following functions:

//The below function returns single Audit Record detail

private static string DisplayAuditDetails(AuditDetail detail)

        {

            // Write out some of the change history information in the audit record.

            Audit record = (Audit)detail.AuditRecord;

 

            StringBuilder sb = new StringBuilder();

 

            sb.Append(“\nAudit record created on: {0}” + record.CreatedOn.Value.ToLocalTime());

            sb.Append(string.Format(“Entity: {0}, Action: {1}, Operation: {2}”,

                record.ObjectId.LogicalName, record.FormattedValues[“action”],

                record.FormattedValues[“operation”]));

 

            // Show additional details for certain AuditDetail sub-types.

            var detailType = detail.GetType();

            if (detailType == typeof(AttributeAuditDetail))

            {

                var attributeDetail = (AttributeAuditDetail)detail;

 

                // Display the old and new attribute values.

                foreach (KeyValuePair<String, object> attribute in attributeDetail.NewValue.Attributes)

                {

                    String oldValue = “(no value)”, newValue = “(no value)”;

 

                    //TODO Display the lookup values of those attributes that do not contain strings.

                    if (attributeDetail.OldValue.Contains(attribute.Key))

                        oldValue = attributeDetail.OldValue[attribute.Key].ToString();

 

                    newValue = attributeDetail.NewValue[attribute.Key].ToString();

 

                    sb.Append(string.Format(“Attribute: {0}, old value: {1}, new value: {2}”,

                        attribute.Key, oldValue, newValue));

                }

 

                foreach (KeyValuePair<String, object> attribute in attributeDetail.OldValue.Attributes)

                {

                    if (!attributeDetail.NewValue.Contains(attribute.Key))

                    {

                        String newValue = “(no value)”;

 

                        //TODO Display the lookup values of those attributes that do not contain strings.

                        String oldValue = attributeDetail.OldValue[attribute.Key].ToString();

 

                        sb.Append(string.Format(“Attribute: {0}, old value: {1}, new value: {2}”,

                            attribute.Key, oldValue, newValue));

                    }

                }

            }

            sb.Append(“”);

            return sb.ToString();

        }

      

        //The below function returns complete Audit Detail for a single record

        private static string GetAuditDetails(string entityLogicalName, Guid entityId,IOrganizationService service)

        {

 

            RetrieveRecordChangeHistoryRequest changeRequest = new RetrieveRecordChangeHistoryRequest();

            changeRequest.Target = new EntityReference(entityLogicalName, entityId);

 

            RetrieveRecordChangeHistoryResponse changeResponse =

                (RetrieveRecordChangeHistoryResponse)service.Execute(changeRequest);

 

            AuditDetailCollection details = changeResponse.AuditDetailCollection;

 

            StringBuilder final = new StringBuilder();

 

            for (int i = 0; i < details.AuditDetails.Count; i++)

            {

                // Display some of the detail information in each audit record.

                if (details.AuditDetails[i].GetType().ToString() == “Microsoft.Crm.Sdk.Messages.AttributeAuditDetail”)

                    final.Append(DisplayAuditDetails(details.AuditDetails[i]));

            }

 

            return final.ToString();

        }

 

Function call :

string auditText = GetAuditDetails(“account”, new Guid(“A3627A42-5994-E411-80E1-C4346BACCF7C”), service);

//auditText can than be embedded in emails.

 

Hope it helps!