XAML 如何在集合视图中显示类对象列表?

cvxl0en2  于 2022-12-16  发布在  其他
关注(0)|答案(1)|浏览(152)

我想在我的视图中显示一个BleDevice类型的列表(可观察的集合)。我在.net maui(.net 7)中使用mvvm模式。
产品型号:

public class BleDevice
    {
        public BleDevice(){}
        public BleDevice(string name, string mac) 
        {
            Name = name;
            MacAddress = mac;
        }
        public string Name {  get; set; }
        public string MacAddress { get; set; }
    }

视图模型:

public partial class MainViewModel: ObservableObject
    {
        
        public MainViewModel()
        {
            devices = new ObservableCollection<BleDevice>();
            devices.Add(new BleDevice("Mystronics Winder", "00:00:00:00:00"));
            devices.Add(new BleDevice("Living Room TV", "25:e7:aa:05:84"));
        }

        [ObservableProperty]
        ObservableCollection<BleDevice> devices;
    }

视图(xaml):(已编辑)

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="MauiApp2.MainPage"
             xmlns:viewmodel="clr-namespace:MauiApp2.ViewModel"
             xmlns:model="clr-namespace:MauiApp2.Model"
             x:DataType="viewmodel:MainViewModel">

    <VerticalStackLayout>
        <CollectionView ItemsSource="{Binding Devices}">
            <CollectionView.ItemTemplate>
                <DataTemplate  x:DataType="{model:BleDevice}">
                    <Grid>
                        <Label Text="{Binding Name}"/>
                        <Label Text="{Binding MacAddress}"/>
                    </Grid>
                </DataTemplate>
            </CollectionView.ItemTemplate>
        </CollectionView>
    </VerticalStackLayout>
</ContentPage>

错误:XFC0045 Binding: Property "Name" not found on "MauiApp2.ViewModel.MainViewModel". MauiApp2 \source\repos\MauiApp2\MauiApp2\View\MainPage.xaml
为什么它能识别"{Binding Devices}",但不能识别"{Binding Name}""{Binding MacAddress}"

pn9klfpd

pn9klfpd1#

ViewModel删除[ObservableProperty]属性并更改为:

public partial class MainViewModel : ObservableObject
    {
        public MainViewModel()
        {
            Devices = new ObservableCollection<BleDevice>();
            Devices.Add(new BleDevice("Mystronics Winder", "00:00:00:00:00"));
            Devices.Add(new BleDevice("Living Room TV", "25:e7:aa:05:84"));
        }

      public ObservableCollection<BleDevice> Devices { get; set; }
    }

**查看(xaml)**删除x:DataType="xxx"

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="MauiApp2.MainPage"
             xmlns:viewmodel="clr-namespace:MauiApp2.ViewModel"
             xmlns:model="clr-namespace:MauiApp2.Model"
             >
    <VerticalStackLayout>
        <CollectionView ItemsSource="{Binding Devices}">
            <CollectionView.ItemTemplate>
                <DataTemplate>
                    <StackLayout>
                        <Label Text="{Binding Name}"/>
                        <Label Text="{Binding MacAddress}"/>
                    </StackLayout>
                </DataTemplate>
            </CollectionView.ItemTemplate>
        </CollectionView>
    </VerticalStackLayout>
</ContentPage>

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