WPF列表视图/数据网格内的按钮

Question

我想获取所点击行的值/ ID.如果选择该行,这可以正常工作.但是,如果我只是尝试单击内部按钮,则所选客户为空.我如何在此处执行命令参数.
我试过这个看到以下问题的答案:

ListView中的ListView和按钮

WPF - 带按钮的Listview

这是代码:

<Grid>
    <ListView ItemsSource="{Binding Path=Customers}"
          SelectedItem="{Binding Path=SelectedCustomer}"
          Width="Auto">
        <ListView.View>
            <GridView>
                <GridViewColumn Header="First Name">
                    <GridViewColumn.CellTemplate>
                        <DataTemplate>
                            <StackPanel Margin="6,2,6,2">
                                <TextBlock Text="{Binding Name}"/>
                            </StackPanel>
                        </DataTemplate>
                    </GridViewColumn.CellTemplate>
                </GridViewColumn>
                <GridViewColumn Header="Address">
                    <GridViewColumn.CellTemplate>
                        <DataTemplate>
                            <StackPanel Margin="6,2,6,2">
                                <Button Content="Address" Command="{Binding Path=DataContext.RunCommand, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ItemsControl}}}"/>
                            </StackPanel>
                        </DataTemplate>
                    </GridViewColumn.CellTemplate>
                </GridViewColumn>
            </GridView>
        </ListView.View>
    </ListView>

</Grid>

public class VM : ViewModelBase
{
    public RelayCommand RunCommand { get; private set; }
    private ObservableCollection<Customer> _Customers;
    public ObservableCollection<Customer> Customers
    {
        get { return _Customers; }
        set
        {
            if (value != _Customers)
            {
                _Customers = value;
                RaisePropertyChanged("Customers");
            }
        }
    }

    private Customer _SelectedCustomer;
    public Customer SelectedCustomer
    {
        get { return _SelectedCustomer; }
        set
        {
            if (value != _SelectedCustomer)
            {
                _SelectedCustomer = value;
                RaisePropertyChanged("SelectedCustomer");
            }
        }
    }

    public VM()
    {
        Customers = Customer.GetCustomers();
        RunCommand = new RelayCommand(OnRun);
    }

    private void OnRun()
    {
        Customer s = SelectedCustomer;
    }
}

在OnRun方法中,选定的Customer将作为null进入.我想要数据行(客户).我该怎么做呢？

Answer 1

您可以选择三种可能的解决方案.

• 将当前行对象作为CommandParameter传递.在这种情况下,您将稍微修改OnRun方法.(推荐的)

<Button Content="Address" Command="{Binding Path=DataContext.RunCommand, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ItemsControl}}}" CommandParameter={Binding} />

我认为CommandParameter = {Binding}工作正常,因为每行的DataContext都是Customer对象.

需要修改OnRun方法以获取参数作为参数.

    private void OnRun(object o){
        if(!(o is Customer)) return;
        // Do something
    }

• 或者,使用SelectionChanged事件处理编写一些代码隐藏.(不建议)

• 或者,在MVVM-light工具包中使用EventToCommand.(不建议)