Pass table-type object as input parameter to Stored Procedure in Oracle from C#

Question

I have stored procedure which accepts table-type as input parameter. How to pass object from c# code?

create or replace TYPE CUSTOM_TYPE AS OBJECT 
( 
  attribute1 VARCHAR(10),
  attribute2 VARCHAR(10)
);

create or replace TYPE CUSTOM_TYPE_ARRAY AS TABLE OF CUSTOM_TYPE;

PROCEDURE SP_TEST
(
  P_TABLE_IN IN CUSTOM_TYPE_ARRAY,
  P_RESULT_OUT OUT SYS_REFCURSOR 
) AS 
BEGIN
  OPEN P_RESULT_OUT FOR
    SELECT  ti.attribute1, ti.attribute2, ti.attribute3
    FROM  TABLE(P_TABLE_IN) ea inner join MYTABLE ti on ea.attribute1 = ti.attribute1 and ea.attribute2 = ti.attribute2;
END SP_TEST;

And trying to add parameter like this:

var oracleParam = new OracleParameter();
oracleParam.OracleDbType = OracleDbType.Array;
oracleParam.Direction = ParameterDirection.Input;
oracleParam.ParameterName = "P_TABLE_IN";
oracleParam.Value = entities;
oracleCommand.Parameters.Add(oracleParam); 

Where entities is an instance of custom collection of entities (with defined oracle attributes mapping)

public class EntityUdt
{
    [OracleObjectMappingAttribute("attribute1")]
    public string attribute1 {get;set;}
    [OracleObjectMappingAttribute("attribute2")]
    public string attribute2 {get;set;}
}

I followed this guide to define .net entity properly but still no luck with passing my list:

System.InvalidOperationException was unhandled by user code
HResult=-2146233079
Message='EntityUdt::attribute1::OracleObjectMappingAttribute' cannot be set to an invalid value of 'attribute1'
Source=Oracle.DataAccess StackTrace: at Oracle.DataAccess.Types.OracleUdtDescriptor.DescribeCustomType(Object customTypeFactory)

Answer 1

I spent hours trying to identify the issue and it turned out that mapping defined by oracle attributes should have different name than property name.

So I just make all the mapping attributes uppercase and it works now!

    [OracleObjectMappingAttribute("ATTRIBUTE1")]
    public string attribute1 { get; set; }
    [OracleObjectMappingAttribute("ATTRIBUTE2")]
    public string attribute2 { get; set; }