C#向ORACLE數據庫BLOB字段存入時報 ORA-01008: 並非所有變量都已綁定

代碼：

OleDbCommand?cmd?=?new?OleDbCommand(cnnstr,?con);

cmd.CommandType?=?CommandType.Text;

cmd.CommandText?=?cnnstr;

string?imgPath?=?@"d:/image.jpg";?

FileStream?file?=?new?FileStream(imgPath,?FileMode.Open,?FileAccess.Read);

Byte[]?imgByte?=?new?Byte[file.Length];?

file.Read(imgByte,?0,?imgByte.Length);

file.Close();

cmd.CommandText?=?"?insert?into?imgtable(id,img?)?values?('17',:img)?";

cmd.Parameters.Add("img",?System.Data.OleDb.OleDbType.Binary,?imgByte.Length);

cmd.Parameters[0].Value?=?imgByte;連接字符串：

strConn?=?"Provider=OraOLEDB.Oracle;pools=true;User?ID="?+?uName?+?";Data?Source="?+?linkStr?+?";Password="?+?uPwd?+?";";

並非：Provider=MSDAORA