IValueConverter: The Swiss Army Knife of Bindings [PropertyViewer sample is a WPF/Silverlight visualization and debugging aid!]

re: IValueConverter: The Swiss Army Knife of Bindings [PropertyViewer sample is a WPF/Silverlight visualization and debugging aid!]

vgsbs — Tue, 06 May 2008 11:57:12 GMT

Cool - I really appreciate you do everything for both Silverlight and WPF.

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Apologies for the sparseness of my posting the last few weeks - work and life have been busy here lately. 

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Readed By Wrocław NUG members — Sun, 15 Jun 2008 18:25:04 GMT

Apologies for the sparseness of my posting the last few weeks - work and life have been busy here lately

Question

Miguel Madero — Fri, 04 Jul 2008 18:20:56 GMT

It's a great example.

Just as a comment, I like the way Ruby On Rails simplify the binding to objects, letting you get friendly names using the Humanize method. That way using an attribute as [DisplayName("Eats Bugs")] is not need just to split the PropertyName based on the case. Altough the attribute gives you more control.

I can see how IValueConverter can be useful in certain escenarios, but most of the time using a FormString would be easier.

I dont know if there's something like that in SL or WPF. I did a trick to do something similar using ValueConverters, it work fine, but I think there should be a sexier solution.

Here's the XAML.

<UserControl.Resources>

<local:StringFormatConverter x:Name="stringFormatter"/>

</UserControl.Resources>

<StackPanel.DataContext>

<SilverlightApplication3:Person/>

</StackPanel.DataContext>

</StackPanel>

Here's de Code

public class StringFormatConverter:IValueConverter

{

#region IValueConverter Members

public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)

{

string formatString = parameter.ToString();

return String.Format("{0:" + formatString + "}", value);

}

public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)

{

throw new NotImplementedException("This Convert supports only OneWay binding");

}

#endregion

}

re: IValueConverter: The Swiss Army Knife of Bindings [PropertyViewer sample is a WPF/Silverlight visualization and debugging aid!]

Delay — Sat, 05 Jul 2008 10:01:20 GMT

Miguel,

Thanks for the kind words - and brief Ruby On Rails lesson! :) I think your approach to string formatting is totally reasonable and it's something I've done once or twice as well. For what it's worth, this scenario should be much easier in WPF 3.5 SP1 because they've added the Binding.StringFormat property (details here: http://blogs.msdn.com/vinsibal/archive/2008/05/16/new-wpf-sp1-feature-data-formatting.aspx). I'm not thinking that'll make it into Silverlight 2, but it sure would be nice!

Silverlight 文章收集

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(以下内容全部整理自博客堂Scottgu博客中文版)Silverlight技巧，诀窍，教程和链接【原文地址】SilverlightTips,Tricks,...

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