A Choice element cannot follow a Fallback element in an AlternateContent element

A Choice element cannot follow a Fallback element in an AlternateContent element. Move the Fallback element to be last.

The child elements of an AlternateContent element must appear in the following order:

1. Choice elements

2. Fallback element

This error is raised when the file is a valid XML document, but is not a well-formed XAML document.

Error ID: XAML0410

To correct this error

• Move the Fallback element to be the last child of the AlternateContent element.

Example

The following code example shows how to define fallback content with the AlternateContent element. The Fallback element follows the Choice element.

        <DockPanel xmlns:mc='https://schemas.openxmlformats.org/markup-compatibility/2006'
        xmlns:v1='assembly.v1'
        xmlns:v2='assembly.v2'
        mc:Ignorable="v2" >

            <mc:AlternateContent>
                <mc:Choice Requires='v2'>
                    <Button Content='V2' />
                </mc:Choice>
                <mc:Fallback>
                    <Button Content='V1'/>
                </mc:Fallback>
            </mc:AlternateContent>

        </DockPanel>

See Also

Concepts

XAML Errors and Help

Other Resources

XAML in WPF

XAML in Silverlight

Markup Compatibility (mc:) Language Features