程序代码：

   /// <summary>
        /// 打印
        /// </summary>
        public void Print()
        {
            this.printdoc = new System.Drawing.Printing.PrintDocument();
            this.printdoc.PrintPage += new System.Drawing.Printing.PrintPageEventHandler(printdoc_PrintPage);
            this.printdoc.Print();
        }

        /// <summary>
        /// 绘制图形
        /// </summary>
private void printdoc_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
{
Font printFont = new Font("宋体", 11,FontStyle.Bold);//这里设置粗体就不行
//e.Graphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.ClearTypeGridFit;
e.Graphics.DrawString(printText, printFont, printFontColor, GetRect(point, drawW, drawH), mStringFormat);
}

程序代码：

using System;
using System.Collections.Generic;
using  System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {

        private System.Drawing.Printing.PrintDocument printdoc;
        public Form1()
        {
            InitializeComponent();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            this.printdoc = new System.Drawing.Printing.PrintDocument();
            //PrintPage事件处理器追加
            printdoc.PrintPage += new System.Drawing.Printing.PrintPageEventHandler(this.printdoc_PrintPage);

            PrintPreviewDialog printPreviewDialog1 = new PrintPreviewDialog();
            printPreviewDialog1.Document = printdoc;
            printPreviewDialog1.FormBorderStyle = FormBorderStyle.Fixed3D;
            printPreviewDialog1.PrintPreviewControl.AutoZoom = false;
            printPreviewDialog1.PrintPreviewControl.Zoom = 1;
            printPreviewDialog1.ShowIcon = false;
            printPreviewDialog1.ShowDialog();
        }

        private void printdoc_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
        {
            StringFormat mStringFormat = new StringFormat();
            mStringFormat.Alignment = StringAlignment.Near;
            mStringFormat.LineAlignment = StringAlignment.Center;
            Font printFont = new Font("宋体", 11, FontStyle.Bold);//这里加上粗体就不行,正常字体是可以的.....
            SolidBrush printFontColor = new SolidBrush(System.Drawing.Color.Blue);//字体颜色

            //e.Graphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.ClearTypeGridFit;//加这句也是不行的....

            e.Graphics.DrawString("测试测试", printFont, printFontColor, new RectangleF(20, 0, 200, 30), mStringFormat);
            e.Graphics.DrawString("测试测试", printFont, printFontColor, new RectangleF(20, 40, 200, 30), mStringFormat);
            e.Graphics.DrawString("测试测试", printFont, printFontColor, new RectangleF(20, 80, 200, 30), mStringFormat);
            e.Graphics.DrawString("测试测试", printFont, printFontColor, new RectangleF(20, 120, 200, 30), mStringFormat);
            e.Graphics.DrawString("测试测试", printFont, printFontColor, new RectangleF(20, 140, 200, 30), mStringFormat);
            e.Graphics.DrawString("测试测试", printFont, printFontColor, new RectangleF(120, 140, 200, 30), mStringFormat);
            e.Graphics.DrawString("测试测试", printFont, printFontColor, new RectangleF(120, 140, 200, 30), mStringFormat);
            e.Graphics.DrawString("测试测试", printFont, printFontColor, new RectangleF(120, 140, 200, 30), mStringFormat); 
        }

        private void button1_Click(object sender, EventArgs e)
        {
            this.printdoc = new System.Drawing.Printing.PrintDocument();
            //PrintPage事件处理器追加
            printdoc.PrintPage += new System.Drawing.Printing.PrintPageEventHandler(this.printdoc_PrintPage);
            printdoc.Print();
        }
    }
}