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XAML - Convert Value to Specific String?

Answer 1

A:

You need a ValueConverter - check out the Binding.Coverter property which should get you started on the right path.

You'd have something like this...

<UserControl.Resources>
    <local:BoolToVisibilityConverter x:Key="BoolToVisibilityConverter" />
</UserControl.Resources>

...then when using...

Converter={StaticResource BoolToVisibilityConverter}

...and you can reuse wherever you like within the same project.

Will A 2010-08-30 16:56:53

I've tried that, but all the code examples show it as part of the code behind for the specific page. Any way for me to locate this in a seperate class as I may need to call this from a number of different locations and I don't want to copy-and-paste.

Sonny Boy 2010-08-30 17:00:40

You can easily create this in a separate class and reuse it on various XAMLs throughout your project.

Will A 2010-08-30 17:02:29

How do I then access it from the XAML in my page? What would that code look like?

Sonny Boy 2010-08-30 17:03:23

Edited to include sample code. Note that `BoolToVisibilityConverter` in my example is a class that implements `IValueConverter`.

Will A 2010-08-30 17:19:46

@Will - I've added a class to the code behind that implments IValueConverter and also tried to add a local resource to my page. I'm getting an error in the XAML when I try to use this:`<local:CourtEventConverter x:Key="CourtEventConverter" />`The error is `The type 'local:CourtEventConverter' was not found. Verify that you are not missing an assembly reference and that all referenced assemblies have been built.`

Sonny Boy 2010-08-30 17:34:18

You'll need to have added `xmlns:local="clr-namespace:namespace-of-your-DLL"` at the top of the XAML, where all the other xmlns reside.

Will A 2010-08-30 17:37:03

@Will - Thank you, sir. All is good in the land of conversion.

Sonny Boy 2010-08-30 18:02:37

Answer 2

A:

Since the value is defined by the users and can't be an enum const, are the user defined values in the database? Maybe you want to make your SQL join the tables and return the column from the joined table with the string.

Jimmy Hoffa 2010-08-30 16:58:40

This defeats the purpose of having a business or presentation layer. I don't want presentation logic in with my objects.

Sonny Boy 2010-08-30 17:02:07

@Sonny Boy: Having a dal object represent an int column as an enum is no more presentation logic than representing an xml column as an xdocument. You wouldn't represent it as a string would you?

Jimmy Hoffa 2010-08-30 17:13:51

@Jimmy - CourtEventStatusCode is a class which can represent any number of user-defined values. While I would prefer to have it defined as an enum which is determined at design-time, I'm afraid that isn't an option.

Sonny Boy 2010-08-30 17:16:23

@Sonny Boy: Ah, you didn't specify it was design time defined, then yes a ValueConverter is what you want. Sorry for assuming it was an enum..

Jimmy Hoffa 2010-08-30 17:18:21

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XAML - Convert Value to Specific String?

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