我正在尝试获取单击的行的值/ID。如果选择了该行,则效果很好。但如果我只是尝试单击里面的按钮,则所选客户为空。我如何在这里执行命令参数。
我尝试过查看以下问题的答案:
ListView 和 ListView 内的按钮 https://stackoverflow.com/questions/3045872/listview-and-buttons-inside-listview
WPF - 带按钮的列表视图 https://stackoverflow.com/questions/4921046/wpf-listview-with-button
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 输入。我想要这里的数据行(客户)。我该怎么做呢?
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。 (受到推崇的)
<Button Content="Address" Command="{Binding Path=DataContext.RunCommand, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ItemsControl}}}" CommandParameter={Binding} />
I think 命令参数={绑定}工作正常,因为每行的 DataContext 都是每个 Customer 对象。
需要修改 OnRun 方法才能获取参数作为参数。
private void OnRun(object o){
if(!(o is Customer)) return;
// Do something
}
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