如何从ODP.NET中存储为BLOB的Oracle表中检索Word / PDF文档

Question

我在检索存储的BLOB文档（Word文档存储为字节）和在Microsoft Word中打开该文档的原始副本时遇到问题。我通过使用DataGridView中列出的数据行的ID号，通过Oracle查询选择blob列。到目前为止，我的代码是读取BLOB文件：

private void btnOpenCV_Click（object sender，EventArgs e）

    { 

        string fileName = Path.GetTempFileName() + ".docx";
        int id = 0;

        OracleConnection con = new OracleConnection(oradb);
        con.Open();
        OracleCommand cmd = new OracleCommand();
        cmd.Connection = con;

        try
        {
            foreach (DataGridViewCell selectedCell in dgvSearchJob.SelectedCells)
            {
                if (selectedCell.Selected)
                    id = Convert.ToInt32(dgvSearchJob.CurrentRow.Cells[0].Value);

                    cmd.CommandText = "SELECT CandidateCV FROM Candidate WHERE CandidateID like '" + id + "'";
                    cmd.CommandType = CommandType.Text;

                    using(OracleDataReader oradr = cmd.ExecuteReader())
                    {
                        while (oradr.Read())
                        {
                            int size = 1024 * 1024;
                            byte[] buffer = new byte[size];
                            int readBytes = 0;
                            int index = 0;

                            using (FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
                            {
                                while ((readBytes = (int)oradr.GetBytes(0, index, buffer, 0, size)) >0)
                                {
                                    fs.Write(buffer, 0, readBytes);
                                    index += readBytes;
                                }
                            }                               
                        }                            
                        oradr.Close();
                    }                                                
            }

            Process prc = new Process();
            prc.StartInfo.FileName = fileName;
            prc.Start();
        }
        catch (ArgumentException ex)
        {
            MessageBox.Show("Error: " + ex.Message);
        }
        catch (OracleException ex1)
        {
            MessageBox.Show("Error: " + ex1.Message);
        }
        catch (Exception ex2)
        {
            MessageBox.Show("Error: " + ex2.Message);
        }
        finally
        {
            cmd.Dispose();
            con.Dispose();
        }
    }

此执行返回异常“系统找不到指定的文件”，我不知道为什么。欢迎任何建议。