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vb.net常用代码集,VB常用代码
求VB.NET对任一excel表格查找替换的代码。
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
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'On Error GoTo EXIT_ERROR
Dim strErrorPos As String = "F_TreatOne"
Dim strFileName As String
strFileName = "d:\test.xlsx"
Dim objExcelApp As New Microsoft.Office.Interop.Excel.Application
Dim objWorkBook As Microsoft.Office.Interop.Excel.Workbook
Dim objSheet As Microsoft.Office.Interop.Excel.Worksheet
objWorkBook = objExcelApp.Workbooks.Open(strFileName)
objSheet = objWorkBook.Worksheets(1)
objSheet.UsedRange.Replace("aaa", "bbb")
objWorkBook.Save()
objWorkBook.Close()
objExcelApp.Quit()
objWorkBook = Nothing
objExcelApp = Nothing
End Sub
需要的话,自已再适当修改修改.
项目中需要加对Microsoft.Office.Interop.Excel的引用.
用vb.net编写记事本源代码
Dim sFileName As String
Dim Search
Private Sub dateTimeMenu_Click()
Text1.Text = Now
End Sub
Private Sub deleteMenu_Click()
Text1.Text = Left(Text1.Text, Text1.SelStart) + Mid(Text1.Text, Text1.SelStart + Text1.SelLength + 1)
End Sub
Private Sub findMenu_Click()
Search = InputBox("请输入要查找的字词：")
Dim Where1 '获取需要查找的字符串变量
Text1.SetFocus '文本框获得焦点，以显示所找到的内容Search = InputBox("请输入要查找的字词：")
Where1 = InStr(Text1.Text, Search) '在文本中查找字符串
If Where1 Then
'若找到则设置选定的起始位置并使找到的字符串高亮
Text1.SelStart = Where1 - 1
Text1.SelLength = Len(Search)
' Me.Caption = Where1 '测试用
'否则给出提示
Else: MsgBox "未找到所要查找的字符串。", vbInformation, "提示"
End If
End Sub
Private Sub findNextMenu_Click()
Dim Where2
Dim StartMe As Integer '查找的起始位置变量
Text1.SetFocus '文本框获得焦点
StartMe = Text1.SelLength + Text1.SelStart + 1 '给变量赋值
Where2 = InStr(StartMe, Text1.Text, Search) '令其从上次找到的地方找起
If Where2 Then
Text1.SelStart = Where2 - 1
Text1.SelLength = Len(Search)
Else: MsgBox "未找到所要查找的字符串.", vbInformation, "提示"
End If
End Sub
Private Sub aboutMenu_Click()
MsgBox Space(2) "文本编辑器版本号1.0" Chr(13) "由西南财经大学天府学院" Chr(13) Space(5) "肖忠 开发" Chr(13) Space(2) "copyright:天府学院"
End Sub
Private Sub allMenu_Click()
Text1.SelStart = 0
Text1.SelLength = Len(Text1.Text)
End Sub
Private Sub backcolorMenu_Click() '设置背景色代码
Form1.CommonDialog1.Action = 3
Text1.BackColor = Form1.CommonDialog1.Color
End Sub
Private Sub colorMenu_Click() '改变文字颜色代码
Form1.CommonDialog1.Action = 3
Text1.ForeColor = Form1.CommonDialog1.Color
End Sub
Private Sub cutMenu_Click()
Clipboard.SetText Text1.SelText
Text1.Text = Left(Text1.Text, Text1.SelStart) + Mid(Text1.Text, Text1.SelStart + Text1.SelLength + 1)
End Sub
Private Sub exitMenu_Click()
End
End Sub
Private Sub fontMenu_Click() '字体菜单代码
Form1.CommonDialog1.Flags = 3 Or 256
Form1.CommonDialog1.Action = 4
If Len(Form1.CommonDialog1.FontName) = 0 Then
Form1.Text1.FontName = "宋体"
Else
Form1.Text1.FontName = Form1.CommonDialog1.FontName
End If
Form1.Text1.FontSize = Form1.CommonDialog1.FontSize
If Form1.CommonDialog1.FontBold = True Then
Form1.Text1.FontBold = True
Else
Form1.Text1.FontBold = False
End If
If Form1.CommonDialog1.FontItalic = True Then
Form1.Text1.FontItalic = True
Else
Form1.Text1.FontItalic = False
End If
Text1.ForeColor = Form1.CommonDialog1.Color
End Sub
Private Sub Form_Load()
Form1.Text1.Width = Form1.Width - 130
Form1.Text1.Height = Form1.Height
End Sub
Private Sub Form_Resize()
Form1.Text1.Width = Form1.Width - 130
Form1.Text1.Height = Form1.Height
End Sub
Private Sub help1Menu_Click()
Form1.CommonDialog1.HelpCommand = cdlHelpForceFile
Form1.CommonDialog1.HelpFile = "c:\windows\system32\winhelp.hlp"
CommonDialog1.ShowHelp
End Sub
Private Sub newMenu_Click()
If Len(Trim(Text1.Text)) = 0 Then
Form1.Caption = "我的记事本" "--" "未命名"
sFileName = "未命名"
Text1.FontSize = 15
Text1.FontName = "宋体"
Text1.Text = ""
Else
Call saveAsMenu_Click
Form1.Caption = "我的记事本" "--" "未命名"
sFileName = "未命名"
Text1.FontSize = 15
Text1.FontName = "宋体"
Text1.Text = ""
End If
End Sub
Private Sub openMenu_Click() '打开文件代码
If Len(Trim(Text1.Text)) = 0 Then
Form1.Caption = "我的记事本"
Form1.CommonDialog1.Filter = "文本文件|*.txt"
Form1.CommonDialog1.Flags = 4096
Form1.CommonDialog1.Action = 1
If Len(Form1.CommonDialog1.FileName) 0 Then
sFileName = Form1.CommonDialog1.FileName
Form1.Caption = Form1.Caption "--" Form1.CommonDialog1.FileTitle
Open sFileName For Input As #1
Text1.FontSize = 15
Text1.FontName = "宋体"
Do While Not EOF(1)
Line Input #1, Text$
All$ = All$ + Text$ + Chr(13) + Chr(10)
Loop
Text1.Text = All
Close #1
End If
Else
Call saveAsMenu_Click
Form1.Caption = "我的记事本"
Form1.CommonDialog1.Filter = "文本文件|*.txt"
Form1.CommonDialog1.Flags = 4096
Form1.CommonDialog1.Action = 1
If Len(Form1.CommonDialog1.FileName) 0 Then
sFileName = Form1.CommonDialog1.FileName
Form1.Caption = Form1.Caption "--" Form1.CommonDialog1.FileTitle
Open sFileName For Input As #1
Text1.FontSize = 15
Text1.FontName = "宋体"
Do While Not EOF(1)
Line Input #1, Text$
All$ = All$ + Text$ + Chr(13) + Chr(10)
Loop
Text1.Text = All
Close #1
End If
End If
End Sub
Private Sub pasteMenu_Click() '粘贴菜单代码
Text1.Text = Left(Text1.Text, Text1.SelStart) + Clipboard.GetText() + Mid(Text1.Text, Text1.SelStart + Text1.SelLength + 1)
End Sub
Private Sub printMenu_Click()
Form1.CommonDialog1.ShowPrinter
For i = 1 To CommonDialog1.Copies
Printer.Print Text1.Text
Printer.Print Text1.Text
Next
Printer.EndDoc
End Sub
Private Sub saveAsMenu_Click() '另存为菜单代码
If Len(Trim(Text1.Text)) 0 Then
Form1.CommonDialog1.DialogTitle = "保存文件"
Form1.CommonDialog1.InitDir = "D:\"
Form1.CommonDialog1.Filter = "文本文件|*.txt"
Form1.CommonDialog1.Flags = 2
Form1.CommonDialog1.ShowSave
If Len(Form1.CommonDialog1.FileName) 0 Then
sFileName = Form1.CommonDialog1.FileName
Open sFileName For Output As #1
whole$ = Text1.Text
Print #1, whole
Close #1
End If
End If
End Sub
Private Sub saveMenu_Click()
If Len(Trim(Text1.Text)) 0 Then
Form1.CommonDialog1.DialogTitle = "保存文件"
Form1.CommonDialog1.InitDir = "D:\"
Form1.CommonDialog1.FileName = "新建文本"
Form1.CommonDialog1.Filter = "文本文件|*.txt"
Form1.CommonDialog1.Flags = 2
Form1.CommonDialog1.ShowSave
If Len(Form1.CommonDialog1.FileName) 0 Then
sFileName = Form1.CommonDialog1.FileName
Open sFileName For Output As #1
whole$ = Text1.Text
Print #1, whole
Close #1
End If
End If
End Sub
Private Sub statusMenu_Click()
End Sub
vb.net vs2008中，如何把常用代码编写成一个模块，然后在不同的窗体中调用？
我的思路是，新建一个“类库”项目，在项目里编写一个类，然后生成，就会得到dll文件。在别的项目里，添加对这个dll文件的引用，就可以使用我们编写的类了。
求vb.net的源代码，最好说明其解决问题，越多越好，满意加50分。
下面这段代码，是我用来计算每个月存500元进银行，连续30年，最后连本带利能有多少钱。这里面涉及复利计算。界面中右边的文本框用来输出每一次计算的结果。
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim nianxian As Integer '年限变量
Dim dingcun As Integer '定存变量
Dim fuli_big As Long '大复利
Dim fuli_small As Long '小复利
Dim i As Integer '循环变量
Dim DATAstring As String '数据字符串
nianxian = Val(年限_TextBox.Text)
dingcun = Val(定存_TextBox.Text)
DATAstring = ""
For i = 1 To nianxian
fuli_small = dingcun * (1 + 0.1875)
dingcun = fuli_small
fuli_big = fuli_big + fuli_small
DATAstring = DATAstring + "[" + Trim(Str(i)) + "]" + Str(fuli_big) + Chr(13) + Chr(10)
'DATAstring = DATAstring + "[" + Trim(Str(i)) + "]" + Str(fuli_small) + Chr(13) + Chr(10)
Next
'fuli_big = fuli_small
TextBox1.Text = DATAstring
结果_TextBox.Text = Str(fuli_big) + "元"
End Sub
vb.net编写的贪吃蛇游戏，带代码的
需用VB实现，代码如下
'定义蛇的运动速度枚举值
Private Enum tpsSpeed
QUICKLY = 0
SLOWLY = 1
End Enum
'定义蛇的运动方向枚举值
Private Enum tpsDirection
D_UP = 38
D_DOWN = 40
D_LEFT = 37
D_RIGHT = 39
End Enum
'定义运动区域4个禁区的枚举值
Private Enum tpsForbiddenZone
FZ_TOP = 30
FZ_BOTTOM = 5330
FZ_LEFT = 30
FZ_RIGHT = 5730
End Enum
'定义蛇头及身体初始化数枚举值
Private Enum tpsSnake
SNAKEONE = 1
SNAKETWO = 2
SNAKETHREE = 3
SNAKEFOUR = 4
End Enum
'定义蛇宽度的常量
Private Const SNAKEWIDTH As Integer = 100
'该过程用于显示游戏信息
Private Sub Form_Load()
Me.Show
Me.lblTitle = "BS贪食蛇 — (版本 " App.Major "." App.Minor "." App.Revision ")"
Me.Caption = Me.lblTitle.Caption
frmSplash.Show 1
End Sub
'该过程用于使窗体恢复原始大小
Private Sub Form_Resize()
If Me.WindowState 1 Then
Me.Caption = ""
Me.Height = 6405 '窗体高度为 6405 缇
Me.Width = 8535 '窗体宽度为 8535 缇
Me.Left = (Screen.Width - Width) \ 2
Me.Top = (Screen.Height - Height) \ 2
End If
End Sub
'该过程用于重新开始开始游戏
Private Sub cmdGameStart_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)
Beep
msg = MsgBox("您确认要重新开始游戏吗？", 4 + 32, "BS贪食蛇")
If msg = 6 Then Call m_subGameInitialize
End Sub
'该过程用于暂停/运行游戏
Private Sub chkPause_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)
If Me.chkPause.Caption = "暂停游戏(P)" Then
Me.tmrSnakeMove.Enabled = False
Me.tmrGameTime.Enabled = False
Me.picMoveArea.Enabled = False
Me.lblPauseLab.Visible = True
Me.chkPause.Caption = "继续游戏(R)"
Else
Me.tmrSnakeMove.Enabled = True
Me.tmrGameTime.Enabled = True
Me.picMoveArea.Enabled = True
Me.lblPauseLab.Visible = False
Me.chkPause.Caption = "暂停游戏(P)"
End If
End Sub
'该过程用于显示游戏规则
Private Sub cmdGameRules_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)
Beep
MsgBox " BS贪食蛇：一个规则最简单的趣味游戏，您将用键盘" Chr(13) _
"上的4个方向键来控制蛇的运动方向。在运动过程中蛇" Chr(13) _
"不能后退，蛇的头部也不能接触到运动区域的边线以外" Chr(13) _
"和蛇自己的身体，否则就游戏失败。在吃掉随机出现的" Chr(13) _
"果子后，蛇的身体会变长，越长难度越大。祝您好运！！", 0 + 64, "游戏规则"
End Sub
'该过程用于显示游戏开发信息
Private Sub cmdAbout_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)
Beep
MsgBox "BS贪食蛇" "(V-" App.Major "." App.Minor "版本)" Chr(13) Chr(13) _
"" Chr(13) Chr(13) _
"由PigheadPrince设计制作" Chr(13) _
"CopyRight(C)2002,BestSoft.TCG", 0, "关于本游戏"
End Sub
'该过程用于退出游戏
Private Sub cmdExit_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)
Beep
msg = MsgBox("您要退出本游戏吗？", 4 + 32, "BS贪食蛇")
Select Case msg
Case 6
End
Case 7
Me.chkWindowButton(2).Value = 0
Exit Sub
End Select
End Sub
'该过程用于拖动窗体_(点击图标)
Private Sub imgWindowTop_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)
ReleaseCapture
SendMessage Me.hwnd, WM_SYSCOMMAND, SC_MOVE, 0
End Sub
'该共用过程用于处理窗体控制按钮组的相关操作_(锁定、最小化、退出)
Private Sub chkWindowButton_MouseUp(Index As Integer, Button As Integer, Shift As Integer, X As Single, Y As Single)
If Button 1 Then Exit Sub
Select Case Index
Case 0 '锁定窗体
If Me.chkWindowButton(0).Value = 1 Then
Me.imgWindowTop.BorderStyle = 0
Me.imgWindowTop.Enabled = False
Else
Me.imgWindowTop.BorderStyle = 1
Me.imgWindowTop.Enabled = True
End If
Case 1 '最小化
Me.WindowState = 1
Me.chkWindowButton(1).Value = 0
Me.Caption = "BS贪食蛇 — (V-" App.Major "." App.Minor "版本)"
Case 2 '退出
Beep
msg = MsgBox("您要退出本游戏吗？", 4 + 32, "BS贪食蛇")
Select Case msg
Case 6
End
Case 7
Me.chkWindowButton(2).Value = 0
Exit Sub
End Select
End Select
End Sub
'该过程用于设置蛇运动速度的快慢
Private Sub hsbGameSpeed_Change()
Me.tmrSnakeMove.Interval = Me.hsbGameSpeed.Value
End Sub
'该过程用于通过键盘的方向键改变蛇的运动方向
Private Sub picMoveArea_KeyDown(KeyCode As Integer, Shift As Integer)
Select Case g_intDirection
Case D_UP
If KeyCode = D_DOWN Then Exit Sub
Case D_DOWN
If KeyCode = D_UP Then Exit Sub
Case D_LEFT
If KeyCode = D_RIGHT Then Exit Sub
Case D_RIGHT
If KeyCode = D_LEFT Then Exit Sub
End Select
g_intDirection = KeyCode
End Sub
'该计时循环过程用于计算游戏耗费的秒数并显示
Private Sub tmrGameTime_Timer()
g_lngGameTime = g_lngGameTime + 1
Me.lblGameTime.Caption = g_lngGameTime "秒"
End Sub
'该计时循环过程用于控制蛇的行动轨迹
Private Sub tmrSnakeMove_Timer()
Dim lngSnakeX As Long, lngSnakeY As Long, lngSnakeColor As Long
Dim lngPointX As Long, lngPointY As Long, lngPointColor As Long
Randomize
Me.picMoveArea.SetFocus
Me.picMoveArea.Cls
'确认蛇头的运动方向并获取新的位置
Select Case g_intDirection
Case D_UP '向上运动
g_udtSnake(SNAKEONE).Snake_CurX = g_udtSnake(SNAKEONE).Snake_OldX
g_udtSnake(SNAKEONE).Snake_CurY = g_udtSnake(SNAKEONE).Snake_OldY
g_udtSnake(SNAKEONE).Snake_CurY = g_udtSnake(SNAKEONE).Snake_CurY - SNAKEWIDTH
Case D_DOWN '向下运动
g_udtSnake(SNAKEONE).Snake_CurX = g_udtSnake(SNAKEONE).Snake_OldX
g_udtSnake(SNAKEONE).Snake_CurY = g_udtSnake(SNAKEONE).Snake_OldY
g_udtSnake(SNAKEONE).Snake_CurY = g_udtSnake(SNAKEONE).Snake_CurY + SNAKEWIDTH
Case D_LEFT '向左运动
g_udtSnake(SNAKEONE).Snake_CurX = g_udtSnake(SNAKEONE).Snake_OldX
g_udtSnake(SNAKEONE).Snake_CurX = g_udtSnake(SNAKEONE).Snake_CurX - SNAKEWIDTH
g_udtSnake(SNAKEONE).Snake_CurY = g_udtSnake(SNAKEONE).Snake_OldY
Case D_RIGHT '向右运动
g_udtSnake(SNAKEONE).Snake_CurX = g_udtSnake(SNAKEONE).Snake_OldX
g_udtSnake(SNAKEONE).Snake_CurX = g_udtSnake(SNAKEONE).Snake_CurX + SNAKEWIDTH
g_udtSnake(SNAKEONE).Snake_CurY = g_udtSnake(SNAKEONE).Snake_OldY
End Select
'根据新的位置绘制蛇头
lngSnakeX = g_udtSnake(SNAKEONE).Snake_CurX
lngSnakeY = g_udtSnake(SNAKEONE).Snake_CurY
lngSnakeColor = g_udtSnake(SNAKEONE).Snake_Color
Me.picMoveArea.PSet (lngSnakeX, lngSnakeY), lngSnakeColor
'移动蛇身体其他部分的位置
For i = 2 To g_intSnakeLength
g_udtSnake(i).Snake_CurX = g_udtSnake(i - 1).Snake_OldX
g_udtSnake(i).Snake_CurY = g_udtSnake(i - 1).Snake_OldY
lngSnakeX = g_udtSnake(i).Snake_CurX
lngSnakeY = g_udtSnake(i).Snake_CurY
lngSnakeColor = g_udtSnake(i).Snake_Color
Me.picMoveArea.PSet (lngSnakeX, lngSnakeY), lngSnakeColor
Next i
'更新蛇旧的坐标位置
For j = 1 To g_intSnakeLength
g_udtSnake(j).Snake_OldX = g_udtSnake(j).Snake_CurX
g_udtSnake(j).Snake_OldY = g_udtSnake(j).Snake_CurY
Next j
'判断蛇在移动中是否到了禁区而导致游戏失败
If m_funMoveForbiddenZone(g_udtSnake(SNAKEONE).Snake_CurX, g_udtSnake(SNAKEONE).Snake_CurY) Then
Beep
MsgBox "您的蛇移动到了禁区，游戏失败！", 0 + 16, "BS贪食蛇"
Me.tmrSnakeMove.Enabled = False
Me.tmrGameTime.Enabled = False
Me.picMoveArea.Visible = False
Exit Sub
End If
'判断蛇在移动中是否碰到了自己的身体而导致游戏失败
If m_funTouchSnakeBody(g_udtSnake(SNAKEONE).Snake_CurX, g_udtSnake(SNAKEONE).Snake_CurY) Then
Beep
MsgBox "您的蛇在移动中碰到了自己的身体，游戏失败！", 0 + 16, "BS贪食蛇"
Me.tmrSnakeMove.Enabled = False
Me.tmrGameTime.Enabled = False
Me.picMoveArea.Visible = False
Exit Sub
End If
'判断蛇是否吃到了果子
If m_funEatPoint(g_udtSnake(SNAKEONE).Snake_CurX, g_udtSnake(SNAKEONE).Snake_CurY) Then
'累加玩家的得分并刷新得分显示
g_intPlayerScore = g_intPlayerScore + 1
Me.lblYourScore.Caption = g_intPlayerScore "分"
Call m_subAddSnake '加长蛇的身体
Call m_subGetPoint '获取下一个果子的位置和颜色
Else
'绘制果子
lngPointX = g_udtPoint.Point_X
lngPointY = g_udtPoint.Point_Y
lngPointColor = g_udtPoint.Point_Color
Me.picMoveArea.PSet (lngPointX, lngPointY), lngPointColor
End If
End Sub
'该私有子过程用于初始化游戏
Private Sub m_subGameInitialize()
Erase g_udtSnake '清空蛇的结构数组
g_intPlayerScore = 0 '清空玩家的得分
g_lngGameTime = 0 '清空游戏耗费的秒数
g_intDirection = D_DOWN '设定蛇的初始运动方向为下
g_intSnakeLength = 4 '设定蛇的初始长度
ReDim g_udtSnake(1 To g_intSnakeLength) '重新定义蛇的长度
'定义蛇头部的数据
With g_udtSnake(SNAKEONE)
.Snake_OldX = 530
.Snake_OldY = 530
.Snake_Color = vbBlack
End With
'定义蛇身第2节的数据
With g_udtSnake(SNAKETWO)
.Snake_OldX = 530
.Snake_OldY = 430
.Snake_Color = vbGreen
End With
'定义蛇身第3节的数据
With g_udtSnake(SNAKETHREE)
.Snake_OldX = 530
.Snake_OldY = 330
.Snake_Color = vbYellow
End With
'定义蛇身第4节的数据
With g_udtSnake(SNAKEFOUR)
.Snake_OldX = 530
.Snake_OldY = 230
.Snake_Color = vbRed
End With
Me.picMoveArea.Visible = True
Me.lblYourScore.Caption = g_intPlayerScore "分"
Me.lblGameTime.Caption = g_lngGameTime "秒"
Me.tmrSnakeMove.Interval = Me.hsbGameSpeed.Value
Me.tmrSnakeMove.Enabled = True
Me.tmrGameTime.Enabled = True
Call m_subGetPoint '获取第一个果子的位置和颜色
End Sub
vb.net 四则运算代码
Dim s1!, s2!, a$ '为小数点的叠加，s1,s2必须定义为单精度型
Dim flag As Boolean 'flag它是过程及的变量，在通用里必须声明
'在数字按钮控件单击数组单击事件中获取操作数（没有区分是哪一个操作数）
Private Sub Command1_Click(Index As Integer)
x = Text1.Text
If flag = True Or x = "0" Then '查看数字是否输入完毕或者是否清零了
Text1.Text = CStr(Index) 'CStr将数值转换字符
Else
Text1.Text = Text1.Text + CStr(Index) '"+"在这里这个是对字符串的操作的叠加，CStr(Index)是接的数据
End If
flag = False '时刻准备数字的输入
End Sub
'2.单击运算符，确定s1，并且要选定运算
Private Sub Command2_Click(Index As Integer)
flag = True
s1 = Val(Text1.Text)
Select Case Index
Case 0
a = "+"
Case 1
a = "-"
Case 2
a = "*"
Case 3
a = "/"
End Select
End Sub
'3."="的单击事件
Private Sub Command3_Click()
flag = True
s2 = Val(Text1.Text)
Select Case a
Case "+"
Text1.Text = s1 + s2
Case "-"
Text1.Text = s1 - s2
Case "*"
Text1.Text = s1 * s2
Case "/"
Text1.Text = s1 / s2 '分母不能为0
End Select
s1 = 0: s2 = 0: a = ""
End Sub
'4.清屏
Private Sub Command4_Click()
Text1.Text = "0"
s1 = 0
s2 = 0
a = ""
flag = False
End Sub
'5.删除最后输入的一个字符，换句话说，将本文框中的字符串取字符（从左往右取left(string,length)），将最后一个字符不取就先行
Private Sub Command5_Click()
If Text1.Text = "" Then
Else
Command5.Enabled = True
Text1.Text = Left(Text1.Text, Len(Text1.Text) - 1)
'len求字符串的长度，left(text1.len(text1)-1减1是取字符串从左往右减去一个字符串
End If
End Sub
'小数点 1）显示出"."(注意前面输入过的整数必须显示) 2）小数后能继续接受数字的输入
Private Sub Command6_Click()
Text1 = Text1 "."
End Sub
'7加入正负号--单击“+、-”,产生一个"-"，而且处于一种等待数字输入的一种状态
Private Sub Command7_Click()
Dim temp As Double
temp = -Val(Text1.Text)
Text1.Text = temp
If d = " " Then s1 = temp Else s2 = temp
End Sub
Private Sub Command8_Click() '退出
End
End Sub
Private Sub Form_Load() '窗体初始化
Text1.Text = 0
Text1.Locked = True
End Sub
本文题目：vb.net常用代码集,VB常用代码
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