create or replace procedure proce_test(paramin in varchar2,paramout out varchar2,paraminout in out varchar2)
as
  varparam varchar2(28);
begin
  varparam:=paramin;
  paramout:=varparam|| paraminout; 
end;

OracleConnection conn = null;
OracleCommand cmd = null;

string strConn = "data source=clientag;user id=ay_plan;password=ayplan";  //连接数据库
conn = new OracleConnection(strConn);
try
{
 conn.Open();
 cmd = new OracleCommand();
 cmd.Connection = conn;
}
catch (Exception e)
{
 throw e;
}

OracleParameter[] parameters ={
 new OracleParameter("paramin",OracleType.VarChar,20),
 new OracleParameter("paramout",OracleType.VarChar,20),
 new OracleParameter("paraminout",OracleType.VarChar,20)
};
parameters[0].Value = "bjd";
parameters[2].Value = "cs";
parameters[0].Direction = ParameterDirection.Input;
parameters[1].Direction = ParameterDirection.Output;
parameters[2].Direction = ParameterDirection.InputOutput;
try
{
 cmd.CommandText = "proce_test";//声明存储过程名
 cmd.CommandType = CommandType.StoredProcedure;
 foreach (OracleParameter parameter in parameters)
 {
     cmd.Parameters.Add(parameter);
 }
 cmd.ExecuteNonQuery();//执行存储过程

 Console.WriteLine(parameters[1].Value.ToString());
 Console.Read();
}
catch (Exception e)
{
 throw e;
}