C# Windows 程序设计 学习笔记2 Paint事件

程序一：

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Drawing;using System.Windows.Forms;namespace PaintEvent{    class Program    {        static void Main(string[] args)        {            Form form = new Form();            form.Text = "PaintEvent";            form.Paint +=new PaintEventHandler(MyPaintHander);            Application.Run(form);        }        static void MyPaintHander(object objSender , PaintEventArgs pea)        {            Graphics gl = pea.Graphics;            Console.WriteLine("PaintEvent");            gl.Clear(Color.Chocolate);        }    }}

程序二：

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Drawing;using System.Windows.Forms;namespace PaintHello{    class Program    {        static void Main(string[] args)        {            Form form = new Form();            form.Text = "PaintHello";            form.BackColor = Color.White;            form.Paint += new PaintEventHandler(MyPaintHander);                        Application.Run(form);        }        static void MyPaintHander(object objSender, PaintEventArgs pea)        {            Form form = (Form)objSender;            Graphics gl = pea.Graphics;            gl.DrawString("PaintHello",form.Font,Brushes.Black,0,0);        }    }}

 程序三：

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Drawing;using System.Windows.Forms;namespace PaintTwoForms{    class Program    {        static Form form1 = new Form();        static Form form2 = new Form();                static void Main(string[] args)        {                      form1.Text = "First Form";            form1.BackColor = Color.White;            form1.Paint += new PaintEventHandler(MyPaintHander);            form2.Text = "Second Form";            form2.BackColor = Color.White;            form2.Paint += new PaintEventHandler(MyPaintHander);            form2.Show();            Application.Run(form1);        }        static void MyPaintHander(object objSender, PaintEventArgs pea)        {            Form form = (Form)objSender;            Graphics gl = pea.Graphics;            string str;            if (form == form1)            {                str = "Hello From the form1";            }            else                str = "Hello From the form2";            gl.DrawString(str, form.Font, Brushes.Black, 0, 0);        }    }}

 程序四：

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Drawing;using System.Windows.Forms;namespace TwoPaintHanders{    class Program    {        static void Main(string[] args)        {            Form form1 = new Form();            form1.Text = "TwoPaintHanders";            form1.BackColor = Color.White;            form1.Paint += new PaintEventHandler(MyPaintHander1);            form1.Paint += new PaintEventHandler(MyPaintHander2);            Application.Run(form1);        }        static void MyPaintHander1(object objSender, PaintEventArgs pea)        {            Form form = (Form)objSender;            Graphics gl = pea.Graphics;            gl.DrawString("First PaintEventHandler", form.Font, Brushes.Black, 0, 0);        }        static void MyPaintHander2(object objSender, PaintEventArgs pea)        {            Form form = (Form)objSender;            Graphics gl = pea.Graphics;            gl.DrawString("Second PaintEventHandler", form.Font, Brushes.Black, 0, 100);        }    }}

 程序五：

using System;using System.Drawing;using System.Windows.Forms;class HelloWorld: Form{    static void Main(string[] args)    {        Application.Run(new HelloWorld());    }    public HelloWorld()    {        Text = "HelloWorld";        BackColor = Color.Write;    }    protected override void OnPaint(PaintEventArgs pea)    {        Graphics gl = pea.Graphics;        gl.DrawString("Hello Windows Forms!", Font, Brushes.Black, 0, 0);    }}

 程序六：

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Drawing;using System.Windows.Forms;namespace inHeritHelloWorld{    class inHeritHelloWorld : HelloWorld    {        public new static void Main(string[] args)        {            Application.Run(new inHeritHelloWorld());        }        public inHeritHelloWorld()        {            Text = "inHerit" + Text;        }        protected override void OnPaint(PaintEventArgs pea)        {            Graphics gl = pea.Graphics;            gl.DrawString("Hello From inHeritHelloWorld!", Font, Brushes.Black, 0, 0);        }    }}