public static bool ReadFieldsFromEventRecord(
EventRecord eventRecord,
EventDefinition eventDefinition,
TraceAggregationConfig traceAggregationConfig,
out List <KeyValuePair <string, double> > numericalFields,
out List <KeyValuePair <string, string> > stringFields,
out string diffFieldValueString,
string logSourceId)
{
numericalFields = new List <KeyValuePair <string, double> >();
stringFields = new List <KeyValuePair <string, string> >();
diffFieldValueString = string.Empty;
// Figure out how many fields the event has
int fieldCount = eventDefinition.Fields.Count;
if (0 == fieldCount)
{
Utility.TraceSource.WriteError(
logSourceId,
"No fields found in event of type {0}.{1}.",
eventDefinition.TaskName,
eventDefinition.EventName);
return(false);
}
// Get the field names and values
try
{
ApplicationDataReader reader = new ApplicationDataReader(
eventRecord.UserData,
eventRecord.UserDataLength);
foreach (FieldDefinition fieldDef in eventDefinition.Fields)
{
var fieldValue = TelemetryUtility.GetEtwEventRecordValue(reader, fieldDef, logSourceId);
if (traceAggregationConfig.FieldsAndAggregationConfigs.ContainsKey(fieldDef.Name))
{
if (null != fieldValue)
{
if (fieldValue is string)
{
stringFields.Add(new KeyValuePair <string, string>(fieldDef.Name, (string)fieldValue));
}
else
{
if (fieldValue is double)
{
numericalFields.Add(new KeyValuePair <string, double>(fieldDef.Name, (double)fieldValue));
}
else
{
Utility.TraceSource.WriteError(
logSourceId,
"Unexpected field value type read. TaskName : {0}, EventName : {1}, FieldName : {2}, FieldType : {3}",
eventDefinition.TaskName,
eventDefinition.EventName,
fieldDef.Name,
fieldDef.Type.ToString());
}
}
}
}
// look if field is the differentiator field
if (traceAggregationConfig.DifferentiatorFieldName == fieldDef.Name)
{
if (null != fieldValue)
{
diffFieldValueString = fieldValue.ToString();
}
}
}
}
catch (Exception e)
{
Utility.TraceSource.WriteError(
logSourceId,
"Failed to get all the fields of event of type {0}.{1}. Exception info: {2}.",
eventDefinition.TaskName,
eventDefinition.EventName,
e);
return(false);
}
return(true);
}
