Pass values to Guid collection/array parameter for anonymous pl/sql block

Question

The following code pops the System.ArgumentException: Invalid parameter binding
Parameter name: p_userguids
at Oracle.DataAccess.Client.OracleParameter.GetBindingSize_Raw(Int32 idx)
at Oracle.DataAccess.Client.OracleParameter.PreBind_Raw()
at Oracle.DataAccess.Client.OracleParameter.PreBind(OracleConnection conn, IntPtr errCtx, Int32 arraySize)
at Oracle.DataAccess.Client.OracleCommand.ExecuteNonQuery()
Any help or advice ?
anonymous pl/sql block text:
DECLARE
TYPE t_guidtable IS TABLE OF RAW(16);
p_userguids t_guidtable;
BEGIN
DELETE testTable where groupname=:groupname;
INSERT INTO testTable (userguid, groupname)
SELECT column_value, :groupname FROM TABLE(p_userguids);
END;
c# code:
public static void SetGroupUsers(string group, List<Guid> users)
OracleConnection conn = Database.ConnectionEssentus;
try
conn.Open();
OracleCommand sqlCmd = new OracleCommand();
sqlCmd.CommandText = sqls["SetGroupUsers"]; // above anonymous block
sqlCmd.Connection = conn;
sqlCmd.BindByName = true;
OracleParameter p_guidCollection = sqlCmd.Parameters.Add("p_userguids", OracleDbType.Raw);
p_guidCollection.Size = users.Count;
p_guidCollection.CollectionType = OracleCollectionType.PLSQLAssociativeArray;
p_guidCollection.UdtTypeName = "t_guidtable";
p_guidCollection.Value = users.ToArray();
sqlCmd.Parameters.Add("groupname", OracleDbType.Varchar2, 30).Value = group;
sqlCmd.ExecuteNonQuery();
catch(Exception ex)
System.Diagnostics.Debug.WriteLine(ex.ToString());
finally
conn.Close();
}

Answer 1

New question,
How can I select records using "in" condition clause likes the following sentence?
SELECT userguid, firstname, lastname FROM UserTable WHERE userguid in (SELECT column_value FROM TABLE(p_userguids))
I tried using PIPE ROW like this, but ORACLE said "PLS-00629: PIPE statement cannot be used in non-pipelined functions"
FOR i in p_userguids.first .. p_userguids.last
LOOP
SELECT userguid, firstname, lastname INTO l_userrecord FROM UserTable WHERE userguid=p_userguids(i);
PIPE ROW(l_userrecord);
END LOOP;