怎样可以dynamic dim object type 在 .NET

bee002

对不起因为我在别的网站type 的很多，也不懂要如何用 话语解释，希望版主可以通融一下我参英文来发文和解释 :handshake:


for each xxx as web.ui.control in contentplaceholder.controls
    Dim bbb as xxx.gettype() <--- got error
    bbb = xxx
    bbb.visible = false
    ...
    ...
next
p/s: because XXX can be textbox , label , chekcbox... any kind of webcontrol


i wish to dim a temporary object as same type as the xxx then assign the xxx to the temporary then only i can access it property like label control got text property , check box got chekced property....

current my alternative solution is


for each xxx as web.ui.control in contentplaceholder.controls

select case true
    case if typeof(xxx) = label then
         dim tempcontrol as lable
          tempcontrol = ctype( xxx , label)
          if tempcontrol.attribute("SGrounp") = "group1" then
                    tempcontrol.visible = "false"
          End if

     case if typeof(xxx) = textbox then
          dim tempcontrol as textbox
          tempcontrol = ctype( xxx , textbox)
          if tempcontrol.attribute("SGrounp") = "group1" then
                    tempcontrol.visible = "false"
          End if

     case if typeof(xxx) = gridview then
          dim tempcontrol as gridview
          tempcontrol = ctype( xxx , gridview )
          if tempcontrol.attribute("SGrounp") = "group1" then
                    tempcontrol.visible = "false"
          End if
     ........
      End select
next




in web page there are can be any kind of web control like panel , check box , table, dropdownlist ......

no way i can use so many select case to cater all kind of web control type

that is why i wish can do soemthing like

for each xxx as web.ui.control in contentplaceholder.controls

dim tempcontrol as typeof (xxx)
tempcontrol = ctype( xxx , typeof (xxx))
if tempcontrol.attribute("SGrounp") = "group1" then
          tempcontrol.visible = "false"
End if

next



but i not able to dim a tempcontrol with dynamically when see what the xxx control is

dim an tempcontrol as typrof(XXX)
dim an tempcontrol as XXX.getype()


有什么方法么？

[ 本帖最后由 bee002 于 21-8-2009 11:39 AM 编辑 ]

richardsssb

关于你第一个 error [gettype]，当然你只可以把他们 cast 去 web.ui.controls，因为那是 base class。

过后，通过 looping 每个 control，才来看它的 gettype 是不是你要的 control。

bee002

其实要gettype不难， 最大的问题是要如何跟据gettype时拿到的control type 来dim 一个新的object... 不想用 select case 一个个来matching

=〉 dim tempcontrol as typeof (xxx)

不过还是谢谢你的帮忙其实我已经找到解决方法了。

[ 本帖最后由 bee002 于 3-10-2009 12:14 PM 编辑 ]