Question

我尝试通过“行为”命令打开“抽屉”菜单（“融合”控件）

Xaml

<Button x:Name="hamburgerButton" 
                                HeightRequest="50" WidthRequest="50" 
                                HorizontalOptions="Start" FontSize="20"
                                BackgroundColor="#1aa1d6" >
                            <Button.Behaviors>
                                <b:EventToCommandBehavior EventName="Clicked" 
                                      Command="{Binding HamburgerButton}" />
                            </Button.Behaviors>

VM CS

    public DelegateCommand HamburgerButton { get; private set; }   
 public QuickPartViewModel(INavigationService navigationService)
{ 
    HamburgerButton = new DelegateCommand(HamburgerButton_Clicked);
}
    public void HamburgerButton_Clicked(object sender, EventArgs e)
            {            
                navigationDrawer.ToggleDrawer();
            }

如果HamburgerButton_Clicked（对象发送方，EventArgs e）带有参数，则我有错误-//聚合：无法从“方法组”转换为操作

如果我要删除Argumments，它将无法正常工作

Answer 1

您想得太多。只需将命令绑定到按钮即可。

在页面中：

<Button Command="{Binding HamburgerCommand}" />

在视图模型中：

public QuickPartViewModel()
{ 
    HamburgerCommand = new DelegateCommand(OnHamburger);
}

public DelegateCommand HamburgerCommand { get; }   

private void OnHamburger()
{            
     navigationDrawer.ToggleDrawer();
}

尝试the docs ...

棱镜按钮单击命令

1 个答案: