XamlCompiler error WMC1118,TwoWay binding target must be a dependency property

 <local:FolderPicker Grid.Row="0" HeaderText="Save Folder" Folder="{x:Bind Attributes.(local:WebUrlRetrieveData.Folder),Mode=TwoWay}"></local:FolderPicker>

XamlCompiler error WMC1118: TwoWay binding target ‘Folder’ must be a dependency property

idl

    [default_interface]
    runtimeclass FolderPicker : Microsoft.UI.Xaml.Controls.Control
    {
        FolderPicker();
        String HeaderText;
        String Folder;
        Microsoft.UI.Xaml.DependencyProperty Folder2;
    }

i don’t know why it throws such an error.

[ranjeshj]

@shelllet the dependency property needs to be written in a certain way. You can look at details here - https://docs.microsoft.com/en-us/windows/uwp/xaml-platform/custom-dependency-properties#dependency-property-name-conventions

[shelllet]

@shelllet the dependency property needs to be written in a certain way. You can look at details here - https://docs.microsoft.com/en-us/windows/uwp/xaml-platform/custom-dependency-properties#dependency-property-name-conventions

it’s my fault, I didn’t notice: folder and folderproperty must exist at the same time. thank you!