Maui .net绑定中继命令到单选按钮

Question

我正在制作一个带有两个单选按钮的视图，唯一的问题是CheckedChanged属性不能绑定到带有RelayCommand注释的方法。根据Visual Studio上的错误显示，它只能绑定到一个属性或值。是否有任何方法可以将此属性绑定到视图模型上的方法?

这是单选按钮:

<RadioButton Value="Player1"
Grid.Row="1"
Grid.ColumnSpan="2"
Content="{Binding Name1}" 
BorderColor="#FF1111"
BorderWidth="20"
VerticalOptions="Center"
IsChecked= "False"
CheckedChanged= "{Binding ChangeCurrentPlayer2Command}"
/>

和中继命令:

void ChangeCurrentPlayer2()
{
if (currentPlayer == Player1)
{
currentPlayer = this.Player2;
}
else
{
currentPlayer = this.Player1;
}
}

Answer 1

我想要的是绑定一个viewmodel方法到事件checkedChanged的单选按钮，我知道如何做到这一点使用一个正常的按钮，通过使用RelayCommand注释。

正如Jason所说，你可以使用。net MAUI Community Toolkit中的EventToCommandBehavior来实现它。

Page.xaml:

<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:toolkit="http://schemas.microsoft.com/dotnet/2022/maui/toolkit"
             xmlns:viewmodel="clr-namespace:MauiApp1.ViewModels"
             x:Class="MauiApp1.NewPage2"
             Title="NewPage2">
    <ContentPage.BindingContext>
        <viewmodel:VM/>
    </ContentPage.BindingContext>
    
    <VerticalStackLayout>
        <RadioButton Value="Player1"
                     x:Name="this"
                 Content="{Binding Name1}"
                 VerticalOptions="Center"
                 IsChecked= "False">
            <RadioButton.Behaviors>
                <toolkit:EventToCommandBehavior
                    EventName="CheckedChanged"
                    Command="{Binding ChangeCurrentPlayer2Command}"
                    CommandParameter="{Binding Source={Reference this}}"/>
            </RadioButton.Behaviors>
        </RadioButton>
        
    </VerticalStackLayout>
</ContentPage>

ViewModel:

namespace MauiApp1.ViewModels
{
    public class VM : INotifyPropertyChanged
    {
       public string name1;
       public string Name1
       {
           get => name1;
           set
           {
               name1 = value;
               OnPropertyChanged(nameof(Name1));
           }
       }
       public event PropertyChangedEventHandler PropertyChanged;
       void OnPropertyChanged(string propertyName)
       {
           PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
       }
        public ICommand ChangeCurrentPlayer2Command { get; set; }
       public VM()
       {
           Name1 = "Player1";
           ChangeCurrentPlayer2Command = new Command<object>(ChangeCurrentPlayer2);
       }
       public void ChangeCurrentPlayer2(object content)
       {
           var radiobutton = content as RadioButton;
           if (Name1 != radiobutton.Value.ToString())
           {
               Name1 = radiobutton.Value.ToString();
           }
           else
           {
               Name1 = "Player2";
           }
       }
    }
}

单击RadioButton时，如果Value与Content绑定的值相同，则改变Content。