WPF列表视图/数据网格内的按钮 [英] Button inside a WPF List view/data grid

问题描述

我正在尝试获取所单击行的值/ID.如果选择了该行，则可以正常工作.但是，如果我只是尝试单击其中的按钮，则所选客户为空.如何在此处执行命令参数.
我试着看到以下问题的答案:

I am trying to get the value/ID of the clicked row. If the row is selected, this works fine. But if I just try to click the button inside, the selected customer is null. How do I do Command Parameters here.
I tried this see the answers to the following questions:

ListView和ListView中的按钮

WPF-带按钮的列表视图

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输入为null.我想要这里的数据行(客户).我该怎么做?

in the OnRun Method, selected Customer is coming in as null. I want the data row(customer) here. How do I do this?

推荐答案

您可以选择三种可能的解决方案.

Three possible solutions that you can choose.

• 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)

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

我认为 CommandParameter = {Binding} 可以正常工作，因为每一行的DataContext是每个Customer对象.

I think CommandParameter={Binding} works fine because the DataContext of each row is each Customer object.

和OnRun方法需要修改才能获取参数作为参数.

and OnRun method needs to be modified in order to get a parameter as an argument.

    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. (不推荐)

  • Or, Write a little code-behind with SelectionChanged event handling. (not recommended)

    或者，在MVVM-light工具箱中使用EventToCommand. (不推荐)

    Or, Use EventToCommand in MVVM-light toolkit. (not recommended)

    这篇关于WPF列表视图/数据网格内的按钮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！