UWP绑定风格二传手不工作 [英] UWP Binding in Style Setter not working

问题描述

我有创建XAML控制问题。我在2015年VS在通用的应用程序编写新的项目。我想创建网格。在此网格我想有一个按钮。在模型中我specifi列（水平）和行。
这是我的code：

I have problem with creating xaml control. I'm writing new project in VS 2015 in universal app. I want create grid. In this grid I want to have a button. In model I specifi the column (Level) and Row. this is my code:

<ItemsControl Grid.Row="1" ItemsSource="{Binding Path=TechnologyList}">
    <ItemsControl.ItemsPanel>
        <ItemsPanelTemplate>
            <Grid>
                <Grid.RowDefinitions>
                    <RowDefinition Height="10*"/>
                    <RowDefinition Height="10*"/>
                    <RowDefinition Height="10*"/>
                    <RowDefinition Height="10*"/>
                    <RowDefinition Height="10*"/>
                    <RowDefinition Height="10*"/>
                    <RowDefinition Height="10*"/>
                    <RowDefinition Height="10*"/>
                    <RowDefinition Height="10*"/>
                    <RowDefinition Height="10*"/>
                </Grid.RowDefinitions>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="14*"/>
                    <ColumnDefinition Width="14*"/>
                    <ColumnDefinition Width="14*"/>
                    <ColumnDefinition Width="14*"/>
                    <ColumnDefinition Width="14*"/>
                    <ColumnDefinition Width="14*"/>
                    <ColumnDefinition Width="14*"/>
                </Grid.ColumnDefinitions>
            </Grid>
        </ItemsPanelTemplate>
    </ItemsControl.ItemsPanel>
    <ItemsControl.ItemContainerStyle>
        <Style TargetType="Control">
            <Setter Property="Grid.Column" Value="{Binding Level}" />
            <Setter Property="Grid.Row" Value="{Binding Row}" />
        </Style>
    </ItemsControl.ItemContainerStyle>
    <ItemsControl.ItemTemplate>
        <DataTemplate>
            <Button Content="{Binding Name}"/>
        </DataTemplate>
    </ItemsControl.ItemTemplate>
</ItemsControl>

我得到了行误差＆LT; setter属性=Grid.ColumnVALUE ={结合水平}/＆GT;
错误：从HRESULT异常：0x8000FFFF（E_UNEXPECTED）是edytor不是在运行code。
哪里不对？在老WPF一切OK，但通用的应用程序为Windows 10我有一个错误。
谁能帮我？

I get a error in line <Setter Property="Grid.Column" Value="{Binding Level}" /> The error: Exception from HRESULT: 0x8000FFFF (E_UNEXPECTED) was in edytor not in running code. What is wrong? In "old" WPF everything was OK but in Universal App for Windows 10 I have a error. Can anyone help me ?

推荐答案

在风格二传手绑定在UWP / Store应用程序不支持。

Bindings in Style Setters are not supported in UWP/Store Apps.

一个解决办法可能是一个辅助类与绑定的源路径附加属性。它有一些辅助的财产PropertyChangedCallback创建于code绑定背后：

A workaround could be a helper class with attached properties for the source paths of the bindings. It creates the bindings in code behind in a PropertyChangedCallback of the helper property:

public class BindingHelper
{
    public static readonly DependencyProperty GridColumnBindingPathProperty =
        DependencyProperty.RegisterAttached(
            "GridColumnBindingPath", typeof(string), typeof(BindingHelper),
            new PropertyMetadata(null, GridBindingPathPropertyChanged));

    public static readonly DependencyProperty GridRowBindingPathProperty =
        DependencyProperty.RegisterAttached(
            "GridRowBindingPath", typeof(string), typeof(BindingHelper),
            new PropertyMetadata(null, GridBindingPathPropertyChanged));

    public static string GetGridColumnBindingPath(DependencyObject obj)
    {
        return (string)obj.GetValue(GridColumnBindingPathProperty);
    }

    public static void SetGridColumnBindingPath(DependencyObject obj, string value)
    {
        obj.SetValue(GridColumnBindingPathProperty, value);
    }

    public static string GetGridRowBindingPath(DependencyObject obj)
    {
        return (string)obj.GetValue(GridRowBindingPathProperty);
    }

    public static void SetGridRowBindingPath(DependencyObject obj, string value)
    {
        obj.SetValue(GridRowBindingPathProperty, value);
    }

    private static void GridBindingPathPropertyChanged(
        DependencyObject obj, DependencyPropertyChangedEventArgs e)
    {
        var propertyPath = e.NewValue as string;

        if (propertyPath != null)
        {
            var gridProperty =
                e.Property == GridColumnBindingPathProperty
                ? Grid.ColumnProperty
                : Grid.RowProperty;

            BindingOperations.SetBinding(
                obj,
                gridProperty,
                new Binding { Path = new PropertyPath(propertyPath) });
        }
    }
}

您将使用它们在XAML是这样的：

You would use them in XAML like this:

<ItemsControl.ItemContainerStyle>
    <Style TargetType="ContentPresenter">
        <Setter Property="local:BindingHelper.GridColumnBindingPath" Value="Level"/>
        <Setter Property="local:BindingHelper.GridRowBindingPath" Value="Row"/>
    </Style>
</ItemsControl.ItemContainerStyle>

这篇关于UWP绑定风格二传手不工作的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！