2017-5-3 打印控件、MDI 窗体容器

打印控件：
要打印，第一步先要想到制作打印对象

PrintDocument - 默认事件

Font f = new Font("黑体",20);
Brush b = new SolidBrush(Color.Red);
e.Graphics.DrawString(textBox1.Text, f, b, 20, 50);

通过对于事件数据的绘制来制作要打印的内容

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MDI 窗体容器

 IsMdiContainer----------------确定该窗体是否是MDI容器

MenuStrip-------------------往MDI容器中放置的菜单

企业仓库，销售，财务三个模块的制作（用到MDI容器和唯一窗体）：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApplication5
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        List<Form> formlist = new List<Form>();
        private void 仓库模块ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            bool has = false;
            Form2 f2 = new Form2();
            foreach(Form f in formlist)
            {
                if(f is Form2)
                {
                    has = true;
                    f2 = f as Form2;
                }
            }
            if (has == false)
            {
                f2.MdiParent = this;
                f2.WindowState = FormWindowState.Maximized;
                f2.Parent = panel1;
                f2.Show();
                formlist.Add(f2);
            }
            else 
            {
                foreach (Form f in formlist) { f.Hide(); }
                f2.Show();
            }
        }

        private void 销售模块ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            bool has = false;
            Form3 f3 = new Form3();
            foreach (Form f in formlist)
            {
                if (f is Form3)
                {
                    has = true;
                    f3 = f as Form3;
                }
            }
            if (has == false)
            {
                f3.MdiParent = this;
                f3.WindowState = FormWindowState.Maximized;
                f3.Parent = panel1;
                f3.Show();
                formlist.Add(f3);
            }
            else
            {
                foreach (Form f in formlist) { f.Hide(); }
                f3.Show();
            }
        }

        private void 财务模块ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            bool has = false;
            Form4 f4 = new Form4();
            foreach (Form f in formlist)
            {
                if (f is Form4)
                {
                    has = true;
                    f4= f as Form4;
                }
            }
            if (has == false)
            {
                f4.MdiParent = this;
                f4.WindowState = FormWindowState.Maximized;
                f4.Parent = panel1;
                f4.Show();
                formlist.Add(f4);
            }
            else
            {
                foreach (Form f in formlist) { f.Hide(); }
                f4.Show();
            }
        }
    }
}