流：

1         private void 打开OToolStripMenuItem_Click(object sender, EventArgs e) 2         { 3             openFileDialog1.Filter = "文本文件|*.txt|全部文件|*.*";//规定文件格式，固定写法。 4             DialogResult dr = openFileDialog1.ShowDialog(); 5             if (dr == DialogResult.OK) 6             { 7                 label1.Text = openFileDialog1.FileName; 8                 StreamReader sr = new StreamReader(openFileDialog1.FileName);//stream就是流，用来文件传输，streamreader是读取文件 9                 textBox1.Text = sr.ReadToEnd();//读到最后10                 //richTextBox1.Text = sr.ReadToEnd();11                 sr.Close();//流只有一条，用完要关闭12             }13         }14         string path = "";15         private void 保存SToolStripMenuItem_Click(object sender, EventArgs e)16         {17             if (path == "")//判断文件保存路径是否存在，如果存在直接保存。18             {19                 saveFileDialog1.FileName = "新建文本文件.txt";20                 saveFileDialog1.ShowDialog();21                 path = saveFileDialog1.FileName;22             }23             StreamWriter sw = new StreamWriter(path);//保存文件24             sw.Write(textBox1.Text);25             sw.Close();26         }

打印控件用法：

1  private void printDocument1_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e) 2         { 3             Font f = new Font("宋体",14); 4             Brush b = new SolidBrush(Color.Black); 5             PointF p = new PointF(10,10); 6             e.Graphics.DrawString(textBox1.Text, f, b, p);//如果要打印，首先要创建一个printDocument来绘制打印对象 7         } 8  9 10 11  private void 打印设置ToolStripMenuItem_Click(object sender, EventArgs e)12         {13             pageSetupDialog1.Document = printDocument1;//制定打印的对象是自己创建的打印对象14             pageSetupDialog1.ShowDialog();15         }16 private void 打印预览VToolStripMenuItem_Click(object sender, EventArgs e)17         {18             //printPreviewControl1.Document = printDocument1;19             printPreviewDialog1.Document = printDocument1;20             printPreviewDialog1.ShowDialog();21         }22 23         private void 打印PToolStripMenuItem_Click(object sender, EventArgs e)24         {25             printDialog1.Document = printDocument1;26             printDialog1.ShowDialog();27         }