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Asp.Net 4 webforms clientid suffixed with `_0`

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Check out this, it explains some new functionality in asp.net 4.0 when it comes to id generation.

Onkelborg 2010-10-26 11:42:11

That's great - it looks like future WebForms programmers will be able to make it produce slightly less awful HTML (those that haven't already run for the MVC hills). Unfortunately it doesn't answer my question: why has it added `_0` to the client id and how can I remove it without rewriting everything?

Keith 2010-10-26 11:45:46

Try this: http://forums.asp.net/p/1305766/2558955.aspx :)

Onkelborg 2010-10-26 11:48:25

Thanks, but that describes a similar problem with a different cause - they were duplicating ids so the suffix was being automatically generated (on Asp.Net 2 too by the looks of it). I have a page that worked in Asp.Net 2, but in 4 the same code (recompiled) now has `_0` suffixed to the client ids and I want it to behave like it used to.

Keith 2010-10-26 11:54:15

Well, it's hard to say without a real world sample, but.. It's an effect of what the last link was about. Here's one more link that describes it: http://www.4guysfromrolla.com/articles/031710-1.aspx

Onkelborg 2010-10-26 13:03:15

Ah, that lead to something that appears to be the cause - the control is in a table, so stupid WebForms assumes that it will repeat the row content and adds the `_0` just in case. Unfortunately the question remains - how do I turn this breaking change off?

Keith 2010-10-26 13:45:47

Try this link: http://weblogs.asp.net/asptest/archive/2009/01/06/asp-net-4-0-clientid-overview.aspx If you set the id generation mode to Legacy then you should get the old behaviour

Onkelborg 2010-10-26 15:19:06

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Asp.Net 4 webforms clientid suffixed with `_0`

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