C#—实验9.1、9.2、9.3和9.4

/*
* 设计电子时钟。要求：启动窗体后，在窗体的标签上显示系统当前日期和时间；单机结束按钮，则停止显示。
*/
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

private void Form1_Load(object sender, EventArgs e)
{
button1.Text = "结束";
timer1.Enabled = true;
timer1.Interval = 1000;
}

private void timer1_Tick(object sender, EventArgs e)
{
label1.Text = DateTime.Now.ToString();
}

private void button1_Click(object sender, EventArgs e)
{
label1.Visible = false;
}
}
}

运行结果：



/*
* 利用Timer和图片框控件，编写一个图片不断向左移动的小动画。
* 要求：
* （1）改变图片的Left值，图片向左（右）移动；改变图片的Top值，图片向下（上）左移动；同时改变图片的Left和Top值，图片斜向移动；
* （2）利用Random类的Next方法产生一定范围的数据作为Left值和Top值，可以使图片随意移动；
* （3）图片不要移出窗体，如果Left值或者Top值超出窗体的范围，能控制图片回到窗体的最左端或最上端。
*/
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication3
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private int num1;
private int num2;
private void Form1_Load(object sender, EventArgs e)
{
button1.Text = "左右移动";
button2.Text = "斜向移动";
button3.Text = "随机";
button4.Text = "结束";
pictureBox1.SizeMode = PictureBoxSizeMode.StretchImage;
pictureBox1.Image = Image.FromFile(Application.StartupPath + @"\g.png");
pictureBox1.Left = 0;
pictureBox1.Top = 0;
timer1.Enabled = false;
timer1.Interval = 50;
timer2.Enabled = false;
timer2.Interval = 50;
timer3.Enabled = false;
timer3.Interval = 50;
}

private void button1_Click(object sender, EventArgs e)
{
timer1.Start();
timer2.Stop();
timer3.Stop();
}

private void button2_Click(object sender, EventArgs e)
{
timer2.Start();
timer1.Stop();
timer3.Stop();
}

private void button3_Click(object sender, EventArgs e)
{
timer1.Stop();
timer2.Stop();
timer3.Start();

}

private void button4_Click(object sender, EventArgs e)
{
timer1.Stop();
timer2.Stop();
timer3.Stop();
}

private void timer1_Tick(object sender, EventArgs e)
{
pictureBox1.Left += 10;
if (pictureBox1.Left > this.ClientSize.Width-150)
{
pictureBox1.Left = 1;
}
}

private void timer2_Tick(object sender, EventArgs e)
{
pictureBox1.Left += 10;
pictureBox1.Top += 10;
if (pictureBox1.Left > this.ClientSize.Width - 150)
{
pictureBox1.Left = 1;
}
if (pictureBox1.Top > this.ClientSize.Height)
{
pictureBox1.Top = 1;
}
}

private void timer3_Tick(object sender, EventArgs e)
{
Random rd = new Random();
num1 = rd.Next(0, 255);
num2 = rd.Next(0, 255);
pictureBox1.Left = num1;
pictureBox1.Top = num2;

}
}
}
运行结果：

/*
* 该窗体中有一个图片框，显示一副图片。
* 要求：
* （1）该窗体打开时，动态加载图片；
* （2）设置图片显示模式为根据图片框大小缩放图片；
* （3）当鼠标留在图片框时，显示如“蛋糕”的文本提示（使用ToolTip控件）；
* （4）在窗体上添加一个按钮，并设置按钮显示文字为“结束程序”。
*/
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

private void Form1_Load(object sender, EventArgs e)
{
button1.Text = "加载";
button2.Text = "结束程序";
}

private void button1_Click(object sender, EventArgs e)
{
this.pictureBox1.Image = Image.FromFile("g.png");   //动态加载
this.pictureBox1.SizeMode = PictureBoxSizeMode.StretchImage;
toolTip1.SetToolTip(pictureBox1, "this is a cat");
}

private void button2_Click(object sender, EventArgs e)
{
DialogResult rs = MessageBox.Show("确定要结束程序吗？[Yes|No]", "提示", MessageBoxButtons.YesNo, MessageBoxIcon.Warning, MessageBoxDefaultButton.Button2);
if (rs == DialogResult.Yes)
Application.Exit();
}
}
}

运行结果：