Variable Variables


Maybe the solution is very simple, but how do I create variable variables in I want to use the value of a variable as a part of the name of another variable. A very simple example below:
Dim a As String
a = "1"
Label a.Text = "hi"

<asp:Label id="Label1" runat="server">Label</asp:Label>

In need this to change a range of values by using just one loop. I can´t do that without creating a variable variable name.
3/11/2005 10:11:59 AM 91979 articles. 4 followers. Follow

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check out this little demo application I created for you:

<%@ Page Language="VB" %>
<script runat="server">
Sub LinkButton1_Click(sender As Object, e As EventArgs)
For i As Integer = 1 To 3
DirectCast(Page.FindControl("Label" & i.ToString), Label).Text = "Hello, World!"
End Sub
<form runat="server">
<asp:Label id="Label1" runat="server">Label</asp:Label>
<asp:Label id="Label2" runat="server">Label</asp:Label>
<asp:Label id="Label3" runat="server">Label</asp:Label>
<asp:LinkButton id="LinkButton1" onclick="LinkButton1_Click" runat="server">Change text</asp:LinkButton>

Especially, pay attention to the DirectCast. You have to find the correct control on the page which accepts as input parameter a string. Then you have to cast it to a certain class, in this case to the Label control class. Once it has been casted then you can access its properties. In this demo I set the Text property.
Hope this helps you out.
Grz, Kris.
Read my blog. Handy Firefox plugins for web developers.

Workaround for non working Mark as answer buttons.
3/11/2005 11:33:36 AM
Thanks! It works perfectly! I hope this feature will be supported in a much easier way in future versions of Was used to it in php, where it´s already easy (just $$var).
3/11/2005 12:35:17 PM

it's not but ASP.NET. You'll also have to cast to the correct type after a FindControl in any other .NET enabled language (like C#).
Grz, Kris.
Read my blog. Handy Firefox plugins for web developers.

Workaround for non working Mark as answer buttons.
3/11/2005 2:51:34 PM
Hi, I'm back again ;)

I used the casting as shown above, it works very well, but now I want to set a variable and not a value of control property.
The new problem is that I want to set a range of html properties by using a loop in the code. Each html property has a string variable as value. Al those variable names are the same, except the number at the end is different.
In the following example a loop should set each cell color one by one. String selectedcell will contain the name of the cellcolor that gets another color than the rest.
Sub setcellcolors (selectedcell As String)
For i As Integer = 0 To 2
Dim tmpcell As String
tmpcell = "cellcolor" & i.ToString
If (tmpcell = selectedcell)
>>>"cellcolor" & i.ToString<<< = "#c9dfdb"
>>>"cellcolor" & i.ToString<<< = "#ffffff"
End If
End Sub

<td bgcolor="<%=cellcolor0%>"
<td bgcolor="<%=cellcolor1%>"
<td bgcolor="<%=cellcolor2%>"
Ofcourse it doesn´t work, this: >>>"cellcolor" & i.ToString<<< should be replaced by something else. I already searched how to cast a string to a variable name, but didn´t find anything. CType and DirectCast can´t do that if I´m right.
Anyway, the example in this post may not be completely correct, and the solution for this example could also be easier than using variable variables, but I just need to know how I do it this way because I will have to use it in other situations as well.
3/11/2005 3:22:25 PM
Still didn´t find out myself how to do this. Can somebody please look at the code in my previous post?

BTW, sorry the code isn´t between code tags, forgot it and couldn´t change it anymore.
3/18/2005 9:43:00 AM

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