WPF Binding String Formatting Question

Question

This is probably pretty simple but I'm trying to take the value from an element in XML and put it in my DataGridTextColumn formatted to 3 decimal places but I can't get it to work...it just leaves it unformatted at like 20. Here is the line I am using. What am I doing wrong?

<DataGridTextColumn Header="Avg" Binding="{Binding Path=Element[avg].Value, StringFormat=0:0.###}"></DataGridTextColumn>

Reed Copsey · Accepted Answer · 2011-02-11 17:30:09Z

3

You need to change your string format specification a bit. This should work:

<DataGridTextColumn Header="Avg" 
    Binding="{Binding Path=Element[avg].Value, StringFormat={}{0:0.###}}">

Note that {} is required at the beginning, since { causes the first part of the StringFormat specifier to be treated as a markup extension.

answered Feb 11, 2011 at 17:30

Reed Copsey

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6 Comments

novacara Over a year ago

Actually, the exact same thing happens with this solution...it remains unformatted.

Reed Copsey Over a year ago

@novacara: What type is it being treated as? Is it an int value or a string? If so, the format string won't work, and you'd need to use an IValueConverter to make it a double or decimal value.

novacara Over a year ago

It is probably being treated as a string. Is there a way to specify the datatype in the xml or is my only option to make a class that implements IValueConverter?

Reed Copsey Over a year ago

@novacara: Value is always a string: msdn.microsoft.com/en-us/library/system.xml.xmlnode.value.aspx You'll need to either turn this into something more meaningful, or use an IValueConverter to change this to a double. The latter is probably nicest, as you could reuse it anywhere...

novacara Over a year ago

Alright, thanks for the nudge in the right direction. I am new to both XML and WPF.

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