ORA-01084: OCI 調用中的參數無效

clob,nclob當值為“”空字符串時，就會出現這個錯誤

 

    OracleParameter op = new OracleParameter("CONTENTclog", OracleType.Clob);
            if (model.CONTENT == ""||model.CONTENT==null)
            {
                op.Value = " ";
            }
            else
            {
                op.Value = model.CONTENT;
               
            }
            OracleParameter[] o = { op };