/// <summary>
/// Converts a string into a transform.
/// </summary>
public override object ConvertFromString(string value, IValueSerializerContext context)
{
if (!string.IsNullOrEmpty(value))
{
UriHolder uriHolder = TypeConverterHelper.GetUriFromUriContext(context, value);
return(BitmapFrame.CreateFromUriOrStream(
uriHolder.BaseUri,
uriHolder.OriginalUri,
null,
BitmapCreateOptions.None,
BitmapCacheOption.Default,
null
));
}
return(base.ConvertFromString(value, context));
}
public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
{
try
{
if (value == null)
{
throw GetConvertFromException(value);
}
if (((value is string) && (!string.IsNullOrEmpty((string)value))) || (value is Uri))
{
UriHolder uriHolder = TypeConverterHelper.GetUriFromUriContext(context, value);
return(BitmapFrame.CreateFromUriOrStream(
uriHolder.BaseUri,
uriHolder.OriginalUri,
null,
BitmapCreateOptions.None,
BitmapCacheOption.Default,
null
));
}
else if (value is byte[])
{
byte[] bytes = (byte[])value;
if (bytes != null)
{
Stream memStream = null;
//
// this might be a magical OLE thing, try that first.
//
memStream = GetBitmapStream(bytes);
if (memStream == null)
{
//
// guess not. Try plain memory.
//
memStream = new MemoryStream(bytes);
}
return(BitmapFrame.Create(
memStream,
BitmapCreateOptions.None,
BitmapCacheOption.Default
));
}
}
else if (value is Stream)
{
Stream stream = (Stream)value;
return(BitmapFrame.Create(
stream,
BitmapCreateOptions.None,
BitmapCacheOption.Default
));
}
return(base.ConvertFrom(context, culture, value));
}
catch (Exception e)
{
if (!CriticalExceptions.IsCriticalException(e))
{
if (context == null && CoreAppContextSwitches.OverrideExceptionWithNullReferenceException)
{
throw new NullReferenceException();
}
IProvideValueTarget ipvt = context?.GetService(typeof(IProvideValueTarget)) as IProvideValueTarget;
if (ipvt != null)
{
IProvidePropertyFallback ippf = ipvt.TargetObject as IProvidePropertyFallback;
DependencyProperty dp = ipvt.TargetProperty as DependencyProperty;
// We only want to call IPPF.SetValue if the target can handle it.
// We need to check for non DP scenarios (This is currently an internal interface used
// only by Image so it's okay for now)
if (ippf != null && dp != null && ippf.CanProvidePropertyFallback(dp.Name))
{
return(ippf.ProvidePropertyFallback(dp.Name, e));
}
}
}
// We want to rethrow the exception in the case we can't handle it.
throw;
}
}