C#打印预览中文显示不正常

Question

怎么才能正常打印中文？// The PrintPage event is raised for each page to be printed.
        private void pd_PrintPage(object sender, PrintPageEventArgs ev)
        {
            float linesPerPage = 0;
            float yPos = 0;
            int count = 0;
            float leftMargin = ev.MarginBounds.Left;
            float topMargin = ev.MarginBounds.Top;
            string line = null;            // Calculate the number of lines per page.
            linesPerPage = ev.MarginBounds.Height /
               printFont.GetHeight(ev.Graphics);            // Print each line of the file.
            while (count < linesPerPage &&
               ((line = streamToPrint.ReadLine()) != null))
            {
                yPos = topMargin + (count *
                   printFont.GetHeight(ev.Graphics));
                ev.Graphics.DrawString(line, printFont, Brushes.Black,
                   leftMargin, yPos, new StringFormat());
                count++;
            }            // If more lines exist, print another page.
            if (line != null)
                ev.HasMorePages = true;
            else
                ev.HasMorePages = false;
        }        private void buttonPreview_Click(object sender, EventArgs e)
        {
            try
            {
                streamToPrint = new StreamReader(textBoxFile.Text);
                try
                {
                    PrintPreviewDialog ppd = new PrintPreviewDialog();
                    printFont = new Font("Fixedsys", 12);
                    PrintDocument pd = new PrintDocument();
                    pd.PrintPage += new PrintPageEventHandler
                       (this.pd_PrintPage);
                    ppd.Document = pd;
                    ppd.ShowDialog();
                }
                finally
                {
                    streamToPrint.Close();
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }