/// <summary>
/// ConvertTo - Attempt to convert an instance of ImageSource to the given type
/// </summary>
/// <returns>
/// The object which was constructoed.
/// </returns>
/// <exception cref="NotSupportedException">
/// A NotSupportedException is thrown if "value" is null or not an instance of ImageSource,
/// or if the destinationType isn't one of the valid destination types.
/// </exception>
/// <param name="context"> The ITypeDescriptorContext for this call. </param>
/// <param name="culture"> The CultureInfo which is respected when converting. </param>
/// <param name="value"> The object to convert to an instance of "destinationType". </param>
/// <param name="destinationType"> The type to which this will convert the ImageSource instance. </param>
public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType)
{
if (destinationType != null && value is ImageSource)
{
ImageSource instance = (ImageSource)value;
if (destinationType == typeof(string))
{
// When invoked by the serialization engine we can convert to string only for some instances
if (context != null && context.Instance != null)
{
#pragma warning disable 6506
if (!instance.CanSerializeToString())
{
throw new NotSupportedException(SR.Get(SRID.Converter_ConvertToNotSupported));
}
#pragma warning restore 6506
}
// Delegate to the formatting/culture-aware ConvertToString method.
return(instance.ConvertToString(null, culture));
}
}
// Pass unhandled cases to base class (which will throw exceptions for null value or destinationType.)
return(base.ConvertTo(context, culture, value, destinationType));
}
/// <summary>
/// Converts a transform into a string.
/// </summary>
public override string ConvertToString(object value, IValueSerializerContext context)
{
ImageSource imageSource = value as ImageSource;
if (imageSource != null)
{
return(imageSource.ConvertToString(null, System.Windows.Markup.TypeConverterHelper.InvariantEnglishUS));
}
else
{
return(base.ConvertToString(value, context));
}
}