CODEWITHSUNDEEP
c#xamldata-bindinguwpuwp-xaml
Daniel Santos
Daniel Santos

Reputation: 15958

Cannot resolve DataType MyApp.Model.Paper

I'm trying to bind a class to a template.

<UserControl
    x:Class="MyApp.Controls.PaperSelectControl"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:MyApp.Controls"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    d:DesignHeight="300"
    d:DesignWidth="400">

    <Grid>
        <ScrollViewer>
            <GridView x:Name="paperGrid" 
                      ItemsSource="{x:Bind Papers}"
                      Width="400" Height="300" >
                <GridView.ItemTemplate >
                    <DataTemplate x:DataType="MyApp.Model.Paper" >
                        <TextBlock Text="{x:Bind Color}"/>
                    </DataTemplate>
                </GridView.ItemTemplate>
            </GridView>
        </ScrollViewer>
    </Grid>
</UserControl>

the MyApp.Model.Paper is the class namespace. 

namespace MyApp.Model {
    public class Paper {
        public string Name { get; set; }
        public string Color { get; set; }
        public string Thumb { get; set; }
    }
}

But i always get the

Cannot resolve DataType MyApp.Model.Paper

error

I hope someone can help me to resolve this issue. Thank you.

Upvotes: 0

Views: 238

Answers (1)

Sunteen Wu
Sunteen Wu

Reputation: 10627

As far as I known we cannot set the x:DataType markup by namespace.class format. For accessing your own custom types you can map a XAML namespace, this mapping is made by defining an xmlns prefix. For example, xmlns:myTypes defines a new XAML namespace that is accessed by prefixing all usages with the token myTypes:.

So please add this mapping xmlns:model="using:MyApp.Model" to your header markup list. And updated the XAML code for x:DataType as follows: <DataTemplate x:DataType="model:Paper" >, then build your project it will work.

More details please reference Mapping custom types to XAML namespaces and prefixes.

Upvotes: 1

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