BeginArray method is a low-level method, which allows to de-serialize array like data manually. Every call to BeginArray method should be matched by a call to NG.Serialization.TDeserializer.EndArray method.

To de-serialize array data, usually there are no need to use BeginArray method, the real Delphi array can be de-serialized using a single call to Value method:

However, there are cases, when the data is not physically stored in array. In such cases its possible to de-serialize array like data manually, using BeginArray/NG.Serialization.TDeserializer.EndArray low-level methods. After a call to BeginArray, all array elements should be read one by one; when array elements was read, a call to NG.Serialization.TDeserializer.EndArray must be made.  An array element can be read using one of the following ways:

• Calling Value method.
• Calling NG.Serialization.TDeserializer.TryNull method, to check, whether the element is Null.
• Calling NG.Serialization.TDeserializer.BeginObject(string)/NG.Serialization.TDeserializer.EndObject methods, if an object element value is expected.
• Calling BeginArray/NG.Serialization.TDeserializer.EndArray methods, if an array element value is expected.

Reference

• NG.Serialization.TDeserializer.EndArray
• NG.Serialization.TDeserializer.HasNext
• Value
• TDeserializer Class
• NG.Serialization Namespace