DbParameter value cannot be converted to OracleRefCursor : C# error

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C#

Oracle

I am trying to create a reader from the given parameter object while trying to parse the 'ref cursor' output to property object in C#. _getDataReaderMethod as below becomes null and could't proceed.

Input: command.Parameters[readerCursorName] sent as dbParameter to GetDataReader method

private static MethodInfo _getDataReaderMethod;
...
...
public DbDataReader GetDataReader(DbParameter dbParameter)
...
...
// Get the value for the parameter ie the ref cursor
object refCursor = dbParameter.Value;
_getDataReaderMethod = refCursor.GetType().GetMethod("GetDataReader");

_getDataReaderMethod becomes 'null' and couldn't proceed further to return the DbDataReader.

returnValue = _getDataReaderMethod.Invoke(dbParameter.Value, null);

Note: An inner exception says 'base {System.SystemException} = {"Method may only be called on a Type for which Type.IsGenericParameter is true."}'

Any suggestions please. Thanks in advance.