可以限制中文輸入的文本框
2024-07-21 02:21:09
供稿:網友
 
根據網友提的意見,大家都需要限制中文輸入,今天,我試驗了一下,找了一個辦法限制中文輸入,測試已經通過,大家也自己試一下吧,有什么意見繼續提,如果愿意加我的qq:36745349
 
這個是在昨天的基礎上做的更改,測試已經滿足大家的要求,如果誰有更好的辦法也請交流一下
下面是代碼:
'sunnyxing2004-04-01最后修改
public class mytextbox
 inherits system.windows.forms.textbox
 private m_strvalidtext as string = "0123456789.+-" & chr(13).tostring
 private m_blneditable as boolean = true
#region " windows 窗體設計器生成的代碼 "
 public sub new()
 mybase.new()
 '該調用是 windows 窗體設計器所必需的。
 initializecomponent()
 '在 initializecomponent() 調用之后添加任何初始化
 end sub
 'usercontrol1 重寫 dispose 以清理組件列表。
 protected overloads overrides sub dispose(byval disposing as boolean)
 if disposing then
 if not (components is nothing) then
 components.dispose()
 end if
 end if
 mybase.dispose(disposing)
 end sub
 'windows 窗體設計器所必需的
 private components as system.componentmodel.icontainer
 '注意: 以下過程是 windows 窗體設計器所必需的
 '可以使用 windows 窗體設計器修改此過程。
 '不要使用代碼編輯器修改它。
 <system.diagnostics.debuggerstepthrough()> private sub initializecomponent()
 components = new system.componentmodel.container
 end sub
#end region
 private sub mytextbox_keypress(byval sender as object, byval e as system.windows.forms.keypresseventargs) handles mybase.keypress
 dim strlocalstring as string
 if editable then
 strlocalstring = m_strvalidtext & chr(8).tostring
 else
 strlocalstring = m_strvalidtext
 end if
 if ucase(strlocalstring).indexof(ucase(e.keychar)) < 0 then
 e.handled = true
 beep()
 else
 end if
 end sub
 public property validtext() as string
 get
 return m_strvalidtext
 end get
 set(byval value as string)
 m_strvalidtext = value
 end set
 end property
 public property editable() as boolean
 get
 return m_blneditable
 end get
 set(byval value as boolean)
 m_blneditable = value
 end set
 end property
 public sub checktext(byval sender as object, byval e as system.eventargs) handles mybase.textchanged
 dim cha as char
 try
 cha = ctype(me.text.substring(me.selectionstart - 1, 1), char)
 if m_strvalidtext.indexof(cha) < 0 then
 me.text = me.text.remove(me.selectionstart - 1, 1)
 end if
 catch ex as exception
 end try
 end sub
end class