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VB编程的七个优良习惯01
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作者：木子
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1、"&"替换"+"
在很多人的编程语言中，用“+”来连接字符串，这样容易导致歧义。良好的习惯是用“&”来连接字符串.
不正确:
Dim sMessage As String
sMessage = "1" + "2"
正确:
Dim sMessage As String
sMessage = "1" & "2"
注意："&"的后面有个空格
2、变量命名大小写，语句错落有秩，源代码维护方面
下面大家比较一下以下两段代码:
读懂难度很大的代码：
Dim SNAME As String
Dim NTURN As Integer
If NTURN = 0 Then
If SNAME = "vbeden" Then
Do While NTURN < 4
NTURN = NTURN + 1
Loop
End If
End If
容易读懂的代码：
Dim sName As String
Dim nTurn As Integer
If nTurn = 0 Then
If sName = "vbeden" Then
Do While nTurn < 4
nTurn = nTurn + 1
Loop
End If
End If
3、请养成以下的“对象命名约定”良好习惯
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推荐使用的控件前缀
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| 控件类型 |
前缀 |
例子 |
| 3D Panel |
pnl |
pnlGroup |
| ADO Data |
ado |
adoBiblio |
| Animated button |
ani |
aniMailBox |
| Check box |
chk |
chkReadOnly |
| Combo box, drop-down list box |
cbo |
cboEnglish |
| Command button |
cmd |
cmdExit |
| Common dialog |
dlg |
dlgFileOpen |
| Communications |
com |
comFax |
| Control （当特定类型未知时，在过程中所使用的） |
ctr |
ctrCurrent |
| Data |
dat |
datBiblio |
| Data-bound combo box |
dbcbo |
dbcboLanguage |
| Data-bound grid |
dbgrd |
dbgrdQueryResult |
| Data-bound list box |
dblst |
dblstJobType |
| Data combo |
dbc |
dbcAuthor |
| Data grid |
dgd |
dgdTitles |
| Data list |
dbl |
dblPublisher |
| Data repeater |
drp |
drpLocation |
| Date picker |
dtp |
dtpPublished |
| Directory list box |
dir |
dirSource |
| Drive list box |
drv |
drvTarget |
| File list box |
fil |
filSource |
| Flat scroll bar |
fsb |
fsbMove |
| Form |
frm |
frmEntry |
| Frame |
fra |
fraLanguage |
| Gauge |
gau |
gauStatus |
| Graph |
gra |
graRevenue |
| Grid |
grd |
grdPrices |
| Hierarchical flexgrid |
flex |
flexOrders |
| Horizontal scroll bar |
hsb |
hsbVolume |
| Image |
img |
imgIcon |
| Image combo |
imgcbo |
imgcboProduct |
| ImageList |
ils |
ilsAllIcons |
| Label |
lbl |
lblHelpMessage |
| Lightweight check box |
lwchk |
lwchkArchive |
| Lightweight combo box |
lwcbo |
lwcboGerman |
| Lightweight command button |
lwcmd |
lwcmdRemove |
| Lightweight frame |
lwfra |
lwfraSaveOptions |
| Lightweight horizontal scroll bar |
lwhsb |
lwhsbVolume |
| Lightweight list box |
lwlst |
lwlstCostCenters |
| Lightweight option button |
lwopt |
lwoptIncomeLevel |
| Lightweight text box |
lwtxt |
lwoptStreet |
| Lightweight vertical scroll bar |
lwvsb |
lwvsbYear |
| Line |
lin |
linVertical |
| List box |
lst |
lstPolicyCodes |
| ListView |
lvw |
lvwHeadings |
| MAPI message |
mpm |
mpmSentMessage |
| MAPI session |
mps |
mpsSession |
| MCI |
mci |
mciVideo |
| Menu |
mnu |
mnuFileOpen |
| Month view |
mvw |
mvwPeriod |
| MS Chart |
ch |
chSalesbyRegion |
| MS Flex grid |
msg |
msgClients |
| MS Tab |
mst |
mstFirst |
| OLE container |
ole |
oleWorksheet |
| Option button |
opt |
optGender |
| Picture box |
pic |
picVGA |
| Picture clip |
clp |
clpToolbar |
| ProgressBar |
prg |
prgLoadFile |
| Remote Data |
rd |
rdTitles |
| RichTextBox |
rtf |
rtfReport |
| Shape |
shp |
shpCircle |
| Slider |
sld |
sldScale |
| Spin |
spn |
spnPages |
| StatusBar |
sta |
staDateTime |
| SysInfo |
sys |
sysMonitor |
| TabStrip |
tab |
tabOptions |
| Text box |
txt |
txtLastName |
| Timer |
tmr |
tmrAlarm |
| Toolbar |
tlb |
tlbActions |
| TreeView |
tre |
treOrganization |
| UpDown |
upd |
updDirection |
| Vertical scroll bar |
vsb |
vsbRate |
推荐使用的数据访问对象 (DAO) 的前缀
用下列前缀来指示数据访问对象 |
| 数据库对象 |
前缀 |
例子 |
| Container |
con |
conReports |
| Database |
db |
dbAccounts |
| DBEngine |
dbe |
dbeJet |
| Document |
doc |
docSalesReport |
| Field |
fld |
fldAddress |
| Group |
grp |
grpFinance |
| Index |
ix |
idxAge |
| Parameter |
prm |
prmJobCode |
| QueryDef |
qry |
qrySalesByRegion |
| Recordset |
rec |
recForecast |
| Relation |
rel |
relEmployeeDept |
| TableDef |
tbd |
tbdCustomers |
| User |
usr |
usrNew |
| Workspace |
wsp |
wspMine |
应用程序频繁使用许多菜单控件，对于这些控件具备一组唯一的命名约定很实用。除了最前面 "mnu" 标记以外，菜单控件的前缀应该被扩展：对每一级嵌套增加一个附加前缀，将最终的菜单的标题放在名称字符串的最后。下表列出了一些例子。
| 推荐使用的菜单前缀 |
| 菜单标题序列 |
菜单处理器名称 |
| File Open |
mnuFileOpen |
| File Send Email |
mnuFileSendEmail |
| File Send Fax |
mnuFileSendFax |
| Format Character |
mnuFormatCharacter |
| Help Contents |
mnuHelpContents |
当使用这种命名约定时，一个特定的菜单组的所有成员一个接一个地列在 Visual Basic 的“属性”窗口中。而且，菜单控件的名字清楚地表示出它们所属的菜单项。
为其它控件选择前缀
对于上面没有列出的控件，应该用唯一的由两个或三个字符组成的前缀使它们标准化，以保持一致性。只有当需要澄清时，才使用多于三个字符的前缀。
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on 星期六, 11月 25th, 2006 at 3:55 pm and is filed under 未分类.
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