使用“时，我无法运行applicaton <ViewCell.ContextActions> 在Xamarin表格（PCL）上？

Question

严重性代码说明项目文件行抑制状态错误位置37:61。 在xmlns http://schemas.microsoft.com/winfx/2009/xaml Course_3中找不到类型Regerence

<ViewCell>
                        <Grid>
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition Width="100"></ColumnDefinition>
                                <ColumnDefinition Width="*"></ColumnDefinition>
                            </Grid.ColumnDefinitions>

                            <Grid Grid.Column="0">
                                <Image Source="{Binding PhotoUrl}" HeightRequest="70"></Image>
                            </Grid>

                            <StackLayout Grid.Column="1" Padding="5">
                                <Label Text="{Binding FullName}" FontSize="15" TextColor="Black" Margin="0,5"></Label>
                                <Label Text="{Binding City}" FontSize="10" TextColor="Black" Margin="0,5"></Label>
                                <Label Text="{Binding JobTitle}" FontSize="10" TextColor="#CCCCCC" Margin="0,5"></Label>
                            </StackLayout>
                            <ViewCell.ContextActions>
                                <MenuItem Text="Edit" Command="{Binding Source={x:Reference Root}, Path=BindingContext.EditCommand}"
                                          CommandParameter="{Binding}"></MenuItem>
                                <MenuItem Text="Delete" Command="{Binding Source={x:Regerence Root},Path=BindingContext.DeleteCommand}"
                                          CommandParameter="{Binding}"></MenuItem>
                            </ViewCell.ContextActions>
                        </Grid>

                    </ViewCell>

Answer 1

您应该将<ViewCell.ContextActions>部分移到Grid控件之外。 它必须是ViewCell的直接ViewCell 。 不知道这是否也是您在代码中创建的类型，但是将第二个菜单项的{x:Regerence Root}更改为{x:Reference Root} 。 同样，您的问题可能会受益于某些编辑以提高其总体质量。

<ViewCell> 
    <ViewCell.ContextActions>
        <MenuItem Text="Edit" Command="{Binding Source={x:Reference Root}, Path=BindingContext.EditCommand}"
                  CommandParameter="{Binding}"></MenuItem>
        <MenuItem Text="Delete" Command="{Binding Source={x:Reference Root},Path=BindingContext.DeleteCommand}"
                  CommandParameter="{Binding}"></MenuItem>
    </ViewCell.ContextActions>
    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="100"></ColumnDefinition>
            <ColumnDefinition Width="*"></ColumnDefinition>
        </Grid.ColumnDefinitions>

        <Grid Grid.Column="0">
            <Image Source="{Binding PhotoUrl}" HeightRequest="70"></Image>
        </Grid>

        <StackLayout Grid.Column="1" Padding="5">
            <Label Text="{Binding FullName}" FontSize="15" TextColor="Black" Margin="0,5"></Label>
            <Label Text="{Binding City}" FontSize="10" TextColor="Black" Margin="0,5"></Label>
            <Label Text="{Binding JobTitle}" FontSize="10" TextColor="#CCCCCC" Margin="0,5"></Label>
        </StackLayout>
    </Grid>

</ViewCell>