Visual Studio2008教程
Visual Studio2008发布后，有大量的VB爱好者抛弃原来的Visual Studio2005平台转向现在流行的Visual Studio2008平台。但是Visual Studio2008有一个缺点就是需要比较高的硬件配置才能正常平稳的运行，所以到现在为止还有一部分人处于观望中，并没有转向这个平台。然而Visual Studio2008的一些新的功能以及优化性比先前版本有了很大的进步。本篇文章将主要介绍怎样利用VB去编写一个计算器程序，程序虽然不复杂，但是其中所运用的知识和代码非常具有代表性，在平时开发中也是经常需要用到的。希望对VB2008的初学者带来帮助。
打开 Visual Studio 2008。在文件 (File) 菜单上，单击新建项目 (New Project)。 在新建项目 (New Project) 对话框的模板 (Templates) 窗格中，单击 Windows 应用程序(Windows Application)。单击确定 (OK)。
在Form1窗体中添加一个TextBox1控件和19个Button按钮，详细属性设置请查看以下的表格。
TextBox1 | 数据显示框 | |
Button1 | 0 | |
Button2 | . | |
Button3 | 归零 | |
Button4 | 无 | |
Button5 | ＝ | |
Button6 | 1 | |
Button7 | 2 | |
Button8 | 3 | |
Button9 | + | |
Button10 | - | |
Button11 | 4 | |
Button12 | 5 | |
Button13 | 6 | |
Button14 | * | |
Button15 | / | |
Button16 | 7 | |
visual studio代码大全Button17 | 8 | |
Button18 | 9 | |
Button19 | ON | |
Button20 | OFF | |
详细的界面请查看图1
图1
好了基本的界面已经设计好了，接下来我们来添加相应的代码了，首先进行必要的声明事件。
Public Class Form1
Dim strdx() As String = {"0", "0", "0"} '声明一个字符串，用以存取数值
Dim calcount1 As String = "0"
Dim calcount2 As String = "0"
Dim strvalue As Boolean = False
然后需要进入Button1.Click事件中.代码如下
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
If strdx(0) = "0" Then
TextBox1.Text = strdx(0) & "."
ElseIf strvalue = False Then
strdx(0) = strdx(0) & "0"
TextBox1.Text = strdx(0) & "."
Else
strdx(0) = strdx(0) & "0"
TextBox1.Text = strdx(0)
End If
End Sub
进入Button2.Click事件中.代码如下
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
strvalue = True
strdx(0) = strdx(0) & "."
TextBox1.Text = strdx(0)
End Sub
进入Button3.Click事件中.代码如下
Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
strdx(0) = "0"
strdx(1) = "0"
strdx(2) = "0"
calcount1 = "0"
calcount2 = "0"
strvalue = False
TextBox1.Text = "0."
End Sub
进入Button5.Click事件中.代码如下
Private Sub Button5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button5.Click
If strdx(2) = "0" Then
Select Case calcount1
Case "+"
TextBox1.Text = Str(Val(strdx(1)) + Val(strdx(0)))
Case "-"
TextBox1.Text = Str(Val(strdx(1)) - Val(strdx(0)))
Case "*"
TextBox1.Text = Str(Val(strdx(1)) * Val(strdx(0)))
Case "/"
If strdx(0) = "0" Then
TextBox1.Text = "error!"
Else
TextBox1.Text = Str(Val(strdx(1)) / Val(strdx(0)))
End If
End Select
ElseIf calcount2 = "*" Then
strdx(0) = Str(Val(strdx(0)) * Val(strdx(2)))
Select Case calcount1
Case "+"
TextBox1.Text = Str(Val(strdx(1)) + Val(strdx(0)))
Case "-"
TextBox1.Text = Str(Val(strdx(1)) - Val(strdx(0)))
Case "*"
TextBox1.Text = Str(Val(strdx(1)) * Val(strdx(0)))
Case "/"
If strdx(0) = "0" Then
TextBox1.Text = "error!"
Else
TextBox1.Text = Str(Val(strdx(1)) / Val(strdx(0)))
End If
End Select
Else : calcount2 = "/"
strdx(0) = Str(Val(strdx(2)) / Val(strdx(0)))
Select Case calcount1
Case "+"
TextBox1.Text = Str(Val(strdx(1)) + Val(strdx(0)))
Case "-"
TextBox1.Text = Str(Val(strdx(1)) - Val(strdx(0)))
Case "*"
TextBox1.Text = Str(Val(strdx(1)) * Val(strdx(0)))
Case "/"
If strdx(0) = "0" Then
TextBox1.Text = "error!"
Else
TextBox1.Text = Str(Val(strdx(1)) / Val(strdx(0)))
End If
End Select
End If
End Sub
进入Button6.Click事件中.代码如下
Private Sub Button6_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button6.Click
If strdx(0) = "0" Then
strdx(0) = "1"
TextBox1.Text = strdx(0) & "."
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