如何解决“索引在数组的边界之外”

Question

我正在使用一项功能来将pdf或word文件上载和下载到SQL Server中。我在下载Blob文件并将其另存为Word文件到PC时遇到问题。

我试图单独下载文件而不进行转换，因此它可以正常工作。但是我无法将其另存为普通的word或pdf文件。

        string constring = "datasource=localhost;database=swiftdb;username=root;password=;SslMode=none;";
        MySqlConnection con = new MySqlConnection(constring);
        FileStream fs;                          // Writes the BLOB to a file (*.bmp).
        BinaryWriter bw;                        // Streams the BLOB to the FileStream object.
        int bufferSize = 100;
        byte[] outbyte = new byte[bufferSize];
        long retval;
        long startIndex = 0;
        string id = "";
        int c = 0; ;

        MySqlCommand cmd = new MySqlCommand("Select Resume from swiftdb.employee where Employeeid=@id", con);
        id = dataGridView1.CurrentRow.Cells[5].Value.ToString();
        cmd.Parameters.AddWithValue("id",id  );
        con.Open();
        MySqlDataReader myReader = cmd.ExecuteReader(CommandBehavior.SequentialAccess);

    while(myReader.Read())
        {
            c++;
            fs = new FileStream("Resume" + id + ".pdf", FileMode.OpenOrCreate, FileAccess.Write);
            bw = new BinaryWriter(fs);
            // Reset the starting byte for the new BLOB.
            startIndex = 0;

            // Read the bytes into outbyte[] and retain the number of bytes returned.
            retval = myReader.GetBytes(1, startIndex, outbyte, 0, bufferSize);

            MessageBox.Show(c.ToString());
            // Continue reading and writing while there are bytes beyond the size of the buffer.
            while (retval == bufferSize)
            {
                bw.Write(outbyte);
                bw.Flush();

                // Reposition the start index to the end of the last buffer and fill the buffer.
                startIndex += bufferSize;
                retval = myReader.GetBytes(1, startIndex, outbyte, 0, bufferSize);
            }

            // Write the remaining buffer.
            bw.Write(outbyte, 0, (int)retval);
            bw.Flush();

            // Close the output file.
            bw.Close();
            fs.Close();
        }

        // Close the reader and the connection.
        myReader.Close();
        con.Close();

我收到错误消息：“索引超出了数组的范围。”  在“ retval = myReader.GetBytes（1，startIndex，outbyte，0，bufferSize）;”。