流和打印控件用法

流：

        private void 打开OToolStripMenuItem_Click(object sender, EventArgs e)
        {
            openFileDialog1.Filter = "文本文件|*.txt|全部文件|*.*";//规定文件格式，固定写法。
            DialogResult dr = openFileDialog1.ShowDialog();
            if (dr == DialogResult.OK)
            {
                label1.Text = openFileDialog1.FileName;
                StreamReader sr = new StreamReader(openFileDialog1.FileName);//stream就是流，用来文件传输，streamreader是读取文件
                textBox1.Text = sr.ReadToEnd();//读到最后
                //richTextBox1.Text = sr.ReadToEnd();
                sr.Close();//流只有一条，用完要关闭
            }
        }
        string path = "";
        private void 保存SToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (path == "")//判断文件保存路径是否存在，如果存在直接保存。
            {
                saveFileDialog1.FileName = "新建文本文件.txt";
                saveFileDialog1.ShowDialog();
                path = saveFileDialog1.FileName;
            }
            StreamWriter sw = new StreamWriter(path);//保存文件
            sw.Write(textBox1.Text);
            sw.Close();
        }

打印控件用法：

 private void printDocument1_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
        {
            Font f = new Font("宋体",14);
            Brush b = new SolidBrush(Color.Black);
            PointF p = new PointF(10,10);
            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
        }



 private void 打印设置ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            pageSetupDialog1.Document = printDocument1;//制定打印的对象是自己创建的打印对象
            pageSetupDialog1.ShowDialog();
        }
private void 打印预览VToolStripMenuItem_Click(object sender, EventArgs e)
        {
            //printPreviewControl1.Document = printDocument1;
            printPreviewDialog1.Document = printDocument1;
            printPreviewDialog1.ShowDialog();
        }

        private void 打印PToolStripMenuItem_Click(object sender, EventArgs e)
        {
            printDialog1.Document = printDocument1;
            printDialog1.ShowDialog();
        }