通过控件的引用迭代 [英] Iterate through a reference of controls

问题描述

如果我有3个带有txtBox1，txtBox2，txtBox3的ID的文本框，如何为文本值引用它们？


Dim varStart as integer = 1

Dim varEnd as integer = 3

Dim myUID As TextBox


for i = varStart to varEnd

myUID。 ID =（" txtUID"& i.ToString）

如果（修剪（CType（myUID，TextBox）.Text）<>""）那么

做点什么

结束如果

next

If I have 3 text boxes with ids of txtBox1, txtBox2, txtBox3, how does one reference them for the text values?

Dim varStart as integer=1
Dim varEnd as integer=3
Dim myUID As TextBox

for i = varStart to varEnd
myUID.ID = ("txtUID" & i.ToString)
If (Trim(CType(myUID, TextBox).Text) <> "") then
do something
End if
next

推荐答案

我对你的问题感到有些困惑。一般来说，你只需要引用它们txtBox1.Text，txtBox2.Text等等......

你能详细说明一下吗？

I''m a bit confused by your question. Generally you would just reference them txtBox1.Text, txtBox2.Text and so on...

Can you elaborate a bit more?

你如果您在网页上，则需要使用.FindControl（字符串ID）。

如果您使用的是Windows窗体，则需要创建.FindControl的功能

You would need to use .FindControl(string id) if you are on a webpage.
If you are in a windows form, you will need to create the functionality of .FindControl

Plater，

感谢您的回复。关于确切的语法仍然有点困惑。


将myUID作为字符串调整

myUID =" txtUID" &安培; i.ToString

Page.FindControl（CType（myUID，TextBox））


以上告诉我字符串无法转换为文本框

Dim myUID As TextBox

myUID.ID =" txtUID" &安培; i.ToString


在我使用.findControl引用Object引用未设置为对象的实例之前阻止了我。


你能告诉我你的意思吗？非常感谢。

Plater,
Thanks for the reply. Still a bit confused about the exact syntax.

Dim myUID As String
myUID = "txtUID" & i.ToString
Page.FindControl(CType(myUID, TextBox))

above tells me string cannot be converted to textbox

Dim myUID As TextBox
myUID.ID = "txtUID" & i.ToString

above stops me before I can reference using .findControl that the Object reference not set to an instance of an object.

Can you tell me what you mean? Thanks so much.

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