Null/Empty binding when getting DataTemplate from ResourceDictionary

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Hi all

I'm trying to get a DatatTemplate from a ResourceDictionary in code. The problem is when I'm trying to save it to string I get all the Binding location to be either empty or null.

Here is my piece of code

ResourceDictionary dictionary = new ResourceDictionary();
dictionary.Source = new Uri("WpfApplication1;component/Dict.xaml", UriKind.RelativeOrAbsolute);
DataTemplate template = (DataTemplate) dictionary["helloTextBox"];
string save = XamlWriter.Save(template.LoadContent());

I'd be happy for any insight.

Thanks

Posted 12-Sep-13 1:56am

Shahare

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Shahare · Accepted Answer · 2013-09-12T02:49:00

It turns out I need to register a binding converter for BindingExpression in TypeConverter in order for the serialize to work on bindings as by default they are not serialized.

Needs to add this class as the ExpressionConverter

public class BindingConverter : ExpressionConverter
{
public override bool CanConvertTo(System.ComponentModel.ITypeDescriptorContext context, Type destinationType)
{
return true;
}

public override object ConvertTo(System.ComponentModel.ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value, Type destinationType)
{
if (destinationType == typeof(MarkupExtension))
{
BindingExpression bindingExpression = value as BindingExpression;
if (bindingExpression == null)
{
throw new FormatException("Expected binding, but didn't get one");
}
return bindingExpression.ParentBinding;
}
return base.ConvertTo(context, culture, value, destinationType);
}
}

and then use this mehtod to register where I do the XamlWriter.Save part

private void Register()
{
Attribute[] attr = new Attribute[1];
TypeConverterAttribute vConv = new TypeConverterAttribute(typeof(BindingConverter));
attr[0] = vConv;
TypeDescriptor.AddAttributes(typeof(BindingExpression), attr);
}