vb.net编程例子 vb教程编程实例详解pdf
用VB.NET编写以下程序。
using System;
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using System.Windows.Forms;
namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
Timer tm = new Timer();//实例化 timeer
static int timeS = 0; //设置静态变量记录秒数
TimeSpan ts = new TimeSpan(); //实例化 TimeSpan
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
tm.Interval = 1000; //设置 timeer 1000毫秒执行一次
tm.Tick += new EventHandler(timeer_Tick); //设置 timeer 运行事件
tm.Start(); // 启用 timeer
}
private void timeer_Tick(object sender, EventArgs e)
{
timeS += 1; //秒数 +1
ts = new TimeSpan(0, 0, timeS);
label1.Text = ts.Hours + ":" + ts.Minutes + ":" + ts.Seconds;
}
private void button2_Click(object sender, EventArgs e)
{
tm.Stop();
timeS = 0;
}
}
}
VB.net实例
1 生成txt文件。
DimSaveFileDialog1AsNewSaveFileDialog() '创建一个保存对话框
SaveFileDialog1.Filter ="txt files (*.txt)|*.txt" '设置扩展名
IfSaveFileDialog1.ShowDialog() = System.Windows.Forms.DialogResult.OKThen '如果确定保存
My.Computer.FileSystem.WriteAllText(SaveFileDialog1.Filename, Textbox1.Text,False) '保存文本,False表示不追加文本，直接覆盖其内容
EndIf
原文链接：
vb.net编程一个用键盘控制的东西
最简单的加速运动示例，直接拷贝代码，即可用方向键控制控件移动
Public Class 最简单的加速运动
Dim 左右, 上下 As Integer
Dim X, Y, VX, VY, VA As Double
Dim WithEvents 时钟 As New Timer
Dim WithEvents 移动控件 As New Label
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
Me.KeyPreview = True
VA = 0.5
X = 300.0
Y = 300.0
移动控件.BackColor = Color.MediumPurple
移动控件.Size = New Size(60, 60)
Controls.Add(移动控件)
时钟.Interval = 25
时钟.Enabled = True
End Sub
Private Sub Form1_KeyDown(sender As Object, e As KeyEventArgs) Handles MyBase.KeyDown
If e.KeyCode = Keys.Up Then 上下 = -1
If e.KeyCode = Keys.Down Then 上下 = 1
If e.KeyCode = Keys.Left Then 左右 = -1
If e.KeyCode = Keys.Right Then 左右 = 1
End Sub
Private Sub Form1_KeyUp(sender As Object, e As KeyEventArgs) Handles MyBase.KeyUp
If e.KeyCode = Keys.Up Then 上下 = 0
If e.KeyCode = Keys.Down Then 上下 = 0
If e.KeyCode = Keys.Left Then 左右 = 0
If e.KeyCode = Keys.Right Then 左右 = 0
End Sub
Private Sub 时钟_Tick(sender As Object, e As EventArgs) Handles 时钟.Tick
VX = Math.Min(VX + 左右 * VA, 10)
VY = Math.Min(VY + 上下 * VA, 10)
X += VX
Y += VY
If X 0 Then X = 2 : VX = -VX
If Y 0 Then Y = 2 : VY = -VY
If X Width - 移动控件.Width Then X = Width - 移动控件.Width - 2 : VX = -VX
If Y Height - 移动控件.Height Then Y = Height - 移动控件.Height - 2 : VY = -VY
移动控件.Location = New Point(X, Y)
End Sub
End Class
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