Question

我有一个计算器样式网格。如何在Xamarin Forms中将按钮的文本作为命令参数传递：

内容资源

<ContentPage.Resources>
    <ResourceDictionary>
        <Style x:Key="PhoneKeys" TargetType="Button">
            <Setter Property="BackgroundColor" Value="White"/>
            <Setter Property="FontSize" Value="36"/>
            <Setter Property="Command" Value="{Binding Source={x:Reference contactsListView}, Path=BindingContext.TapCommand1}"/>
            <Setter Property="CommandParameter" Value="Pass Button Text"/>
        </Style>
    </ResourceDictionary>
</ContentPage.Resources>

网格布局

<Button Style="{StaticResource PhoneKeys}" Text="1" Grid.Row="1" Grid.Column="0" />
<Button Style="{StaticResource PhoneKeys}" Text="1" Grid.Row="1" Grid.Column="0" />
<Button Style="{StaticResource PhoneKeys}" Text="2" Grid.Row="1" Grid.Column="1" />
<Button Style="{StaticResource PhoneKeys}" Text="3" Grid.Row="1" Grid.Column="2" />
<Button Style="{StaticResource PhoneKeys}" Text="4" Grid.Row="2" Grid.Column="0" />
<Button Style="{StaticResource PhoneKeys}" Text="5" Grid.Row="2" Grid.Column="1" />
<Button Style="{StaticResource PhoneKeys}" Text="6" Grid.Row="2" Grid.Column="2" />
<Button Style="{StaticResource PhoneKeys}" Text="7" Grid.Row="3" Grid.Column="0" />
<Button Style="{StaticResource PhoneKeys}" Text="8" Grid.Row="3" Grid.Column="1" />
<Button Style="{StaticResource PhoneKeys}" Text="9" Grid.Row="3" Grid.Column="2" />
<Button Style="{StaticResource PhoneKeys}" Text="*" Grid.Row="4" Grid.Column="0" />
<Button Style="{StaticResource PhoneKeys}" Text="0" Grid.Row="4" Grid.Column="1" />
<Button Style="{StaticResource PhoneKeys}" Text="#" Grid.Row="4" Grid.Column="2" />

Answer 1

使用此语法获取控件“ {x：Reference myButton}” 的属性您可以发送自己的按钮参考以获取完整的按钮对象

样式

    <Setter Property="CommandParameter" Value="{x:Reference myButton}" />

XAML

<Button x:Name="myButton" Style="{StaticResource PhoneKeys}" Text="#" Grid.Row="4" Grid.Column="2" />

定义每个按钮的按钮名称，并获取该按钮的对象引用。

public ICommand TapCommand1 => new Command((obj) =>
{
        var button = obj as Button;
        var text = button.Text;
});

或用每个按钮名称在每个按钮中定义命令参数的最佳方法

        <Button x:Name="myButton" Style="{StaticResource PhoneKeys}" CommandParameter="{x:Reference myButton}" Text="#" Grid.Row="4" Grid.Column="2" />

将按钮值作为命令参数传递

1 个答案: