public static string ParseCheckpointTagCorrelationId(this string source)
{
try
{
if (string.IsNullOrEmpty(source))
return null;
var reader = new JsonTextReader(new StringReader(source));
if (!reader.Read()) return null;
if (reader.TokenType != JsonToken.StartObject) return null;
while (true)
{
CheckpointTag.Check(reader.Read(), reader);
if (reader.TokenType == JsonToken.EndObject)
break;
if (reader.TokenType != JsonToken.PropertyName) return null;
var name = (string) reader.Value;
switch (name)
{
default:
if (!reader.Read()) return null;
var jToken = JToken.ReadFrom(reader);
if (name == "$correlationId")
return jToken.ToString();
break;
}
}
return null;
}
catch (JsonReaderException)
{
return null;
}
}