窗口不显示。 WPF

Question

我创建了一个带有按钮的DataGridTemplateColumn。我用Command 绑定了它，但是在我点击它之后，什么也没有发生。但是，如果我将按钮移到 DataGrid 的外部，它可以正常工作。

<DataGrid AutoGenerateColumns="False" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" ItemsSource="{Binding MedCards}">
    <DataGrid.Columns>
        <DataGridTextColumn Header="ID" Binding = "{Binding Id, Mode=TwoWay}"/>
        <DataGridTextColumn Header="ID клиента" Binding = "{Binding Client_Id, Mode = TwoWay}"/>
        <DataGridTextColumn Header="Вес" Binding = "{Binding Weight, Mode = TwoWay}"/>
      <!--  <DataGridTextColumn Header="Рекомендация" Binding = "{Binding Recommend, Mode = TwoWay}"/> -->
        <DataGridTemplateColumn Header="Рекомендация">
            <DataGridTemplateColumn.CellTemplate>
                <DataTemplate>
                    <Button Command="{Binding Path=ShowRecommendCommand}" CommandParameter="{Binding Recommend}" Content="Посмотреть"/>
                </DataTemplate>
            </DataGridTemplateColumn.CellTemplate>
        </DataGridTemplateColumn>
        <!-- -->
            <DataGridTextColumn Header="Рост" Binding = "{Binding Height, Mode = TwoWay}"/>
        <DataGridTextColumn Header = "Проблемы" Binding = "{Binding Problems, Mode = TwoWay}"/>
        <DataGridTextColumn Header = "BodyType" Binding = "{Binding BodyType, Mode = TwoWay}"/>
    </DataGrid.Columns>
</DataGrid>

命令：

 private RelayCommand showRecommendCommand;
    public RelayCommand ShowRecommendCommand
    {
        get
        {
            return showRecommendCommand ??
                (showRecommendCommand = new RelayCommand(obj =>
                {
                    RecommendViewModel viewModel = new RecommendViewModel();
                    viewModel.Recommend = Convert.ToString(obj);
                    RecommendWindow window = new RecommendWindow();
                    window.Show();
                }));
        }
    }

Answer 1

您的Button 位于DataTemplate 内部，因此无法直接访问外部数据上下文。试试这个。

给你的DataGrid 起个名字

<DataGrid Name="myGrid" AutoGenerateColumns="False" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" ItemsSource="{Binding MedCards}">

然后使用ElementName 访问绑定中的外部数据上下文。

<Button Command="{Binding Path=DataContext.ShowRecommendCommand, ElementName=myGrid}" CommandParameter="{Binding Recommend}" Content="Посмотреть"/>

另外，为了将来参考，调试时打开即时窗口以查看绑定错误。