How would I implement this?
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daljv wrote: So I want to use a switch statement. The problem is, how? Why not just do soomething like this:
ControlCollection col = (ControlCollection)this.Controls;
foreach(Control t in col)
{
if(t is TextBox)
{
if(t.Text != String.Empty)
{
// Do something here.
break;
}
}
}-Nick Parker
this won't work - t is TextBox, t would still be a Control which does not have a .Text field so use "as". also why are you casting this.Controls? its a ControlCollection already...
foreach(Control t in this.Controls) { TextBox tb = t as TextBox; if(tb != null && tb.Text == String.Empty) { // Do something here break; } }
"When the only tool you have is a hammer, a sore thumb you will have."
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this won't work - t is TextBox, t would still be a Control which does not have a .Text field so use "as". also why are you casting this.Controls? its a ControlCollection already...
foreach(Control t in this.Controls) { TextBox tb = t as TextBox; if(tb != null && tb.Text == String.Empty) { // Do something here break; } }
"When the only tool you have is a hammer, a sore thumb you will have."
Philip Fitzsimons wrote: this won't work Yes, it will, try it. Philip Fitzsimons wrote: also why are you casting this.Controls? its a ControlCollection already... Test your code, it will fail if you don't cast it, mine did, I previously wasn't casting it. :) -Nick Parker
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Roland Bär wrote: This argument lacks, if there are more text boxes in th esame form... Show me an example please. -Nick Parker
Sorry, not precice enough ... :-O if you have the 20 textboxes, that should be tested, and then also other textboxes in the same form, that should not be checked, it is better to have the 20 textboxes in an own collection. Like this you can iterate over your collection without checking if it is a textbox to be checked or not. Hope it is clear what I mean. :~ greets Roland
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Philip Fitzsimons wrote: this won't work Yes, it will, try it. Philip Fitzsimons wrote: also why are you casting this.Controls? its a ControlCollection already... Test your code, it will fail if you don't cast it, mine did, I previously wasn't casting it. :) -Nick Parker
I can't see who it would work - it won't work on my computer... "t" is a Control. "t.Text" is not valid on a Control. how does it compile?
"When the only tool you have is a hammer, a sore thumb you will have."
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Sorry, not precice enough ... :-O if you have the 20 textboxes, that should be tested, and then also other textboxes in the same form, that should not be checked, it is better to have the 20 textboxes in an own collection. Like this you can iterate over your collection without checking if it is a textbox to be checked or not. Hope it is clear what I mean. :~ greets Roland
Roland Bär wrote: if you have the 20 textboxes, that should be tested, and then also other textboxes in the same form, that should not be checked, it is better to have the 20 textboxes in an own collection. Like this you can iterate over your collection without checking if it is a textbox to be checked or not. There are other ways around your problem, however my answer still identifies how to accomplish what he was asking for. -Nick Parker
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I can't see who it would work - it won't work on my computer... "t" is a Control. "t.Text" is not valid on a Control. how does it compile?
"When the only tool you have is a hammer, a sore thumb you will have."
Philip Fitzsimons wrote: how does it compile? Drop my code onto a form, it works. :-D -Nick Parker
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Nick Parker wrote: Because then he would have to maintain that collection where as the Form already maintains a collection of all controls applied to it hmm.. yes, I see what you mean. ...speaking of which, let me ask this: If I picked the TextBox object that gets added to the Form's Controls collection (say it is named tBox1), and simply add it to my own collection (say an Hashtable) like so: myTable.Add(myTable.Count, tBox1); Wouldn't I be adding just a reference? Thus the impact on the memory would be relatively small? Or am I missing something here?
There are many ways in which you can tackle this, depending on the exact circumstances you should consider using a specific method. My method is rather abstract. :) -Nick Parker
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Philip Fitzsimons wrote: how does it compile? Drop my code onto a form, it works. :-D -Nick Parker
no it does not: error CS0117: 'System.Web.UI.Control' does not contain a definition for 'Text'
"When the only tool you have is a hammer, a sore thumb you will have."
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no it does not: error CS0117: 'System.Web.UI.Control' does not contain a definition for 'Text'
"When the only tool you have is a hammer, a sore thumb you will have."
Philip Fitzsimons wrote: no it does not: Ah, I see you are doing this on an ASP.NET webform. This works on a Windows Form. ;) -Nick Parker
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Philip Fitzsimons wrote: no it does not: Ah, I see you are doing this on an ASP.NET webform. This works on a Windows Form. ;) -Nick Parker
:-D
"When the only tool you have is a hammer, a sore thumb you will have."