Useful WPF Data Converters
May 31st, 2012
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Just sharing the most common WPF data binding converters that I encounter on day to day basis. This should be beneficial for every WPF developer.
Usage
Usage in XAML should be as follows:
- Define the XAML namespace to point to the common namespace where you would store your common converters. For example:
- Use converter like this:
<window ...
xmlns:converters="clr-namespace:MyCompany.MyProject.MyConverters" >
xmlns:converters="clr-namespace:MyCompany.MyProject.MyConverters" >
<button Content="Push Me" Click="ButtonConvertToBool_Click"
Visibility="{Binding Path=Something, Converter={x:Static converters:BoolToVisibleConverter.Instance}}"
IsEnabled="{Binding Path=SomeOtherThing, Converter={x:Static converters:IsNotNullConverter.Instance}}"></button>
Visibility="{Binding Path=Something, Converter={x:Static converters:BoolToVisibleConverter.Instance}}"
IsEnabled="{Binding Path=SomeOtherThing, Converter={x:Static converters:IsNotNullConverter.Instance}}"></button>
Common Converters
IsNullConverter
Gets an object as an input and returns true if the object is not null; otherwise returns false.
public class IsNullConverter : IValueConverter
{
private static readonly IsNullConverter _instance = new IsNullConverter();
public static IsNullConverter Instance
{
get { return IsNullConverter._instance; }
}
private IsNullConverter()
{
}
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
try
{
return (value == null);
}
catch
{
return null;
}
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
return Binding.DoNothing;
}
}
{
private static readonly IsNullConverter _instance = new IsNullConverter();
public static IsNullConverter Instance
{
get { return IsNullConverter._instance; }
}
private IsNullConverter()
{
}
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
try
{
return (value == null);
}
catch
{
return null;
}
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
return Binding.DoNothing;
}
}
