/// <summary>
/// Tries to find a Converter using its static resource name.
/// </summary>
/// <param name="converterName"></param>
/// <returns>The converter, or a NullConverter instance.</returns>
public static IValueConverter FindConverter(string converterName)
{
// Get instead of Find as we want to reproduce the Jupiter behavior : is the resource is missing we get an exception.
var converter = Registry.FindResource(converterName) as IValueConverter;
if (converter == null)
{
Registry.Log().ErrorFormat("Resource [{0}] does not implement IValueConverter.", converterName);
// Reproduce the beahvior on Jupiter : if the resource does not implements IValueConverter,
// nothing appear in the view.
converter = new NullConverter();
}
return(converter);
}
public void TestNullConverter()
{
var converter = new NullConverter();
converter.TreatEmptyStringAsNull = false;
Assert.AreEqual(true, converter.Convert(null, null, null, null));
Assert.AreEqual(false, converter.Convert(1, null, null, null));
Assert.AreEqual(false, converter.Convert(new object(), null, null, null));
Assert.AreEqual(false, converter.Convert(string.Empty, null, null, null));
converter.TreatEmptyStringAsNull = true;
Assert.AreEqual(true, converter.Convert(null, null, null, null));
Assert.AreEqual(false, converter.Convert(1, null, null, null));
Assert.AreEqual(false, converter.Convert(new object(), null, null, null));
Assert.AreEqual(true, converter.Convert(string.Empty, null, null, null));
}
private void WhenCreating()
{
ThenConverter = new NullConverter();
}
