如何在Xamarin.Forms中将参数从一页传递到另一页? [英] How to pass a parameter from one Page to another Page in Xamarin.Forms?

问题描述

我想通过 MVVM模式将表单中的按钮按下到另一个表单时发送一个值.

I want to send a value when I press a button in a form to another form through the MVVM pattern.

这是XAML文件

 <Button x:Name="myButton"
            Text="RandomButton"
            TextColor="#000000"
            BackgroundColor="{x:Static local:FrontEndConstants.ButtonBackground}"
            Grid.Row="2" Grid.Column="0"
            Grid.ColumnSpan="3"
            Command="{Binding NewPage}"
            CommandParameter="100">     
</Button>

这是我的ModelView class，将我重定向到其他表单.

And this is my ModelView class where I get redirected to another form.

class JumpMVVM :INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;

        private INavigation _navigation;

        public ICommand NewPage
        {
            get
            {
                return new Command(async () =>
                { 
                    await _navigation.PushAsync(new Page2()); // HERE
                });
            }
        }

        public JumpMVVM() { }

        public JumpMVVM(INavigation navigation)
        {                
            _navigation = navigation;                
        }

跳转有效.如何将"CommandParameter"发送到"Page2"?

The jump works. How can I send that "CommandParameter" to "Page2" ?

谢谢， 德拉戈斯

推荐答案

最简单的方法是将值作为参数传递给Page2的构造函数.或者，您也可以在Page2上创建一个公共属性，并在创建属性后为其分配值.

The easiest approach would be to pass the value as a parameter to the constructor of Page2. Or you could create a public property on Page2 and assign the value to it after you create it.

await _navigation.PushAsync(new Page2(argument_goes_here)); // HERE

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