c#读取oracle blob生成dwg

string connstring2 = “Data Source=(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=******)(PORT=1521))(CONNECT_DATA=(SERVICE_NAME=*)));User Id=;Password=*********”;
private void button3_Click(object sender, EventArgs e)
{
OracleConnection con = new OracleConnection(connstring2);
con.Open();
string sql = “select * from TEMP_001 t”;
OracleCommand com = new OracleCommand(sql, con);

OracleDataReader rs = com.ExecuteReader();

while (rs.Read())

{

byte[] File = (byte[])rs["MAP_FILE"];
string nm = (string)rs["ADDRESS"];

FileInfo fi=new FileInfo(“F://”+nm+".dwg");

FileStream fs=fi.OpenWrite();

fs.Write(File,0,File.Length);

fs.Flush();
fs.Close();

}

rs.Close();
com.Dispose();
con.Dispose();
con.Close();
this.label1.Text = “Ok”;

    }