C# 单击按钮时动态发送id xamarin

我有一个动态生成的列表，显示发票编号和发票日期，还有一个“更多”按钮，当按下该按钮时，用户将深入查看发票

我正在努力确定如何绑定id，然后单击“更多”按钮发送id

我的代码：

    <?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="App1.LoggedIn">
    <ContentPage.Content>
        <StackLayout Padding="10">
            <Label x:Name="header" FontSize="25" Text="Invoices" 
           HorizontalOptions="Center" VerticalOptions="CenterAndExpand"
            />
            <ListView x:Name="BillView" ItemsSource="{Binding Bills}">
                <ListView.ItemTemplate>
                    <DataTemplate>
                        <ViewCell>
                            <Grid>
                                <Label YAlign="Center" XAlign="Center" Grid.Column="0" Text="{Binding InvoiceNumber}" />
                                <Label YAlign="Center" XAlign="Center" Grid.Column="1" Text="{Binding InvoiceDate}" />
                                <Button Grid.Column="2" Text="More" VerticalOptions="StartAndExpand" Clicked="GetInvoiceDetails(HELP!!)" />
                            </Grid>
                        </ViewCell>
                    </DataTemplate>
                </ListView.ItemTemplate>
            </ListView>
        </StackLayout>
    </ContentPage.Content>
</ContentPage>

---

尝试将命令设置为按钮，而不是单击事件

<Button Grid.Column="2" BindingContext="{Binding Source={x:Reference BillView}, Path=BindingContext}"   Command="{Binding YOUCOMMAND}"   CommandParameter="{Binding Source={x:Reference Item}, Path=BindingContext}"></Button>

---

由于您使用了列表视图，并且您的命令位于DataTemplate中，所以绑定将附加到ItemSource中每个单独模型的绑定上下文。

若您使用Mvvm，则可以单击按钮传输模型

您可以使用此命令来实现它

   <Button Grid.Column="2" Text="More" VerticalOptions="StartAndExpand" Command="{ Binding BindingContext.GetIdCommand, Source={x:Reference Name=BillView} }"  CommandParameter="{Binding .}"  />

这是MyBillViewModel的

  public class MyBillViewModel
{
    public ICommand GetIdCommand { protected set; get; }
    public ObservableCollection<Bill> Bills { get; set; }
    public INavigation Navigation { get; set; }

    public MyBillViewModel(INavigation navigation)
    {
        this.Navigation = navigation;
        Bills = new ObservableCollection<Bill>();
        Bills.Add(new Bill { InvoiceDate = "2020/2/23", InvoiceNumber = "1" });
        Bills.Add(new Bill { InvoiceDate = "2020/2/23", InvoiceNumber = "2" });
        Bills.Add(new Bill { InvoiceDate = "2020/2/23", InvoiceNumber = "3" });
        Bills.Add(new Bill { InvoiceDate = "2020/2/23", InvoiceNumber = "4" });
        Bills.Add(new Bill { InvoiceDate = "2020/2/23", InvoiceNumber = "5" });
        Bills.Add(new Bill { InvoiceDate = "2020/2/23", InvoiceNumber = "6" });
        Bills.Add(new Bill { InvoiceDate = "2020/2/23", InvoiceNumber = "7" });


        GetIdCommand = new Command<Bill>(async (key) => {
            Bill bill=(Bill)key;
            await Navigation.PushAsync(new Page2(bill));

        });
     }
}

这是我的跑步记录


我将我的演示更新到github，您可以参考它

不要单击事件，而是尝试
command
event当我放置断点时，它似乎没有点击命令。在哪里添加断点？没有断点，工作正常吗？我将断点放在YOUCOMMAND函数中，它永远不会被击中。让我自己再试一次，你能将演示更新到github吗？
    <StackLayout Padding="10">
        <Label x:Name="header" FontSize="25" Text="Invoices" 
       HorizontalOptions="Center" VerticalOptions="CenterAndExpand"
        />
        <ListView x:Name="BillView" ItemsSource="{Binding Bills}">
            <ListView.ItemTemplate>
                <DataTemplate>
                    <ViewCell>
                        <Grid>
                        <Label YAlign="Center" x:Name="MyInvoiceNumber" XAlign="Center" Grid.Column="0" Text="{Binding InvoiceNumber}" />
                            <Label YAlign="Center" XAlign="Center" Grid.Column="1" Text="{Binding InvoiceDate}" />

                        <Button Grid.Column="2" Text="More" VerticalOptions="StartAndExpand" Command="{ Binding BindingContext.GetIdCommand, Source={x:Reference Name=BillView} }"  CommandParameter="{Binding .}"  />
                        </Grid>
                    </ViewCell>
                </DataTemplate>
            </ListView.ItemTemplate>
        </ListView>
    </StackLayout>

 public partial class MainPage : ContentPage
{
    public MainPage()
    {
        InitializeComponent();
        BindingContext = new MyBillViewModel(Navigation);
    }
}

  public class MyBillViewModel
{
    public ICommand GetIdCommand { protected set; get; }
    public ObservableCollection<Bill> Bills { get; set; }
    public INavigation Navigation { get; set; }

    public MyBillViewModel(INavigation navigation)
    {
        this.Navigation = navigation;
        Bills = new ObservableCollection<Bill>();
        Bills.Add(new Bill { InvoiceDate = "2020/2/23", InvoiceNumber = "1" });
        Bills.Add(new Bill { InvoiceDate = "2020/2/23", InvoiceNumber = "2" });
        Bills.Add(new Bill { InvoiceDate = "2020/2/23", InvoiceNumber = "3" });
        Bills.Add(new Bill { InvoiceDate = "2020/2/23", InvoiceNumber = "4" });
        Bills.Add(new Bill { InvoiceDate = "2020/2/23", InvoiceNumber = "5" });
        Bills.Add(new Bill { InvoiceDate = "2020/2/23", InvoiceNumber = "6" });
        Bills.Add(new Bill { InvoiceDate = "2020/2/23", InvoiceNumber = "7" });


        GetIdCommand = new Command<Bill>(async (key) => {
            Bill bill=(Bill)key;
            await Navigation.PushAsync(new Page2(bill));

        });
     }
}

    public class Bill
{
    public  string InvoiceNumber { get; set; }
    public string InvoiceDate { get; set; }
}