CODEWITHSUNDEEP
wpfbindingheightunits-of-measurement
Ant
Ant

Reputation: 31

Binding the Height of a Control to a unit specific measurement

I am aware that in WPF you can specify the Height of a Control in different units.

For example:

<Setter Property="Height" Value="0.35cm"></Setter>

I want to bind the Height of a Control to a property in my ViewModel. How do I specify that the height is in centimeters when using a binding? I have tried to set the Height property in the ViewModel to a String and append "cm" behind the height measurement:

The ViewModel is created in XAML as follows:

<local:HeadingViewModel Height="0.35cm"></local:HeadingViewModel>

The Height of the Control is set via a binding in the style:

<Setter Property="Height" Value="{Binding Height, RelativeSource={RelativeSource Mode=TemplatedParent}}"></Setter>

This sets the height, but it is not in centimeters. It seems to be set in the default units of WPF. Nothing happens when I change the height from "0.35cm" to "0.35in". It seems to stay in the default unit of WPF.

How can I set the Height property of a Control via Binding in a different measurement unit than the default unit?

Upvotes: 2

Views: 352

Answers (1)

Tim Rogers
Tim Rogers

Reputation: 21713

There isn't really a concept of binding using different units in WPF - all there is, is a TypeConverter - LengthConverter - which converts a string as provided by XAML into a double. Depending on the units you enter, it multiplies the result by a certain factor.

So if you want to bind to a double, you have to make sure you convert that double in code to WPF's units of 1/94th of an inch. Or you could make an IValueConverter to do it for you.

If you want to bind to a string, you could write an IValueConverter and call LengthConverter from within.

Upvotes: 1

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