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When creating a custom field in SharePoint 2010, what method do I need to override to control what is rendered for the custom field type in the list where it is used?

I tried overriding GetFieldValue to no effect.

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I have the same problem but using sharepoint services 3.0 who can help me, I need run querys in custum fields when the list view or load. I dont know how run a custom handler for list event. tks. JosePa. – user6035 Dec 15 '11 at 18:02

@Marek is right in his assertion that you should use XSLT. However, in 2010 (only) there are functions you can override to alter a field's output:

Each of these accepts an Object value input, which is either the raw data directly from the list, or the output from the <RenderPattern Name="DisplayPattern"> in the fldTypes...xml (if you're using <Field Name="CAMLRendering">TRUE</Field>).

The output from whichever of these functions is used is then pushed through the XSLT (if you've provided any) and rendered.

I haven't seen any examples of this method being used in the wild, however (we don't use it due to 2007 incompatibility) so I'd advise caution.

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Unless I've missed something, these aren't actually called when rendering to a regular list view. – Rawling Aug 16 '12 at 7:38
@Rawling: I'm guessing you're using 2007, or possibly a 2007 site migrated to 2010? – Stuart Pegg Aug 16 '12 at 7:40
Nope, 2010 here. I don't -think- I've missed anything in my implementation - my constructors and BaseFieldControl overrides get hit - but these methods jsut don't get called. – Rawling Aug 16 '12 at 7:49
Could be to do with your field type. Which SPField derivative are you inheriting from? – Stuart Pegg Aug 16 '12 at 8:42
I'm inheriting SPMultiLineText - I'm trying to make a Markdown column :) I've got it rendering properly in item Display forms via a custom rendering control which calls GetFieldValueAsHTML but not in the list. – Rawling Aug 16 '12 at 8:44

SharePoint 2010 renders fields on a list view is with XSLT style sheets, so there is no method to override. If you want a your own way of rendering on list views, you need to create a custom XSLT style sheet named fldtypes_*.xsl and deployed it to (14 hive)\TEMPLATE\LAYOUTS\XSL.

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A field type's rendering can be controller by binding it to a BaseFieldControl derived custom control:

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I took "in the list" to mean "in the List View". Looks like we've covered both bases between us. :) – Stuart Pegg Jun 24 '11 at 21:53

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