CODEWITHSUNDEEP
c#winformsdata-binding
Coderer
Coderer

Reputation: 27294

How do I data bind Control.Enabled to !(field)?

I have a (varchar) field Foo which can only be specified if (bit) Bar is not true. I would like the textbox in which Foo is displayed to be disabled when Bar is true -- essentially, FooBox.Enabled = !isBar. I'm trying to do something like

FooBox.DataBindings.Add(new Binding("Enabled", source, "!isBar"));

but of course the bang in there throws an exception. I've also tried constructs like "isBar != true" or "isBar <> true", but none work. Am I barking up the wrong tree here?

Upvotes: 1

Views: 2055

Answers (3)

Jacob Adams
Jacob Adams

Reputation: 4004

I tried doing something like this a while ago and the best I could come up with was either

a) Changing the source class to also have a NotBar property and bind to that

b) Make a dumb wrapper class around source that has a NotBar property and bind to that.

Upvotes: 1

gcores
gcores

Reputation: 12656

if isBar is a property of the source class (otherwise you need a property of a class to do the binding) this should work:

FooBox.DataBindings.Add("Enabled", source, "isBar");

but remember that source.isBar must exist and be a boolean.

Upvotes: -1

FlySwat
FlySwat

Reputation: 175653

As far as I can tell, Databind uses reflection to find the member passed as the 3rd string argument. You cannot pass an expression there, just the member name.

Upvotes: 3

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