我正在 VS 22 中使用 .Net MAUI 制作一个应用程序，我设置了一个简单的页面，在其中显示项目列表，但是当我尝试运行代码时，出现此错误：
严重性代码描述项目文件行抑制状态详细信息 错误（活动）XFC0045 绑定：在“ProjectName .ViewModels.ParkingSistemiViewModel”上找不到属性“DodatniNaziv”。项目名称 (net8.0-windows10.0.19041.0) C:*** epos\项目名称\项目名称\Views\MainDashboard.xaml 64
我花了好几个小时才弄清楚，但我就是不明白问题是什么，如果有人可以提供帮助，我将不胜感激
这是我的代码： 1.) XAML 页面
<?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"
xmlns:viewModels="clr-namespace:ProjectName.ViewModels"
x:Class="ProjectName.Views.MainDashboard"
xmlns:models="ProjectName.Models"
x:DataType="viewModels:ParkingSistemiViewModel"
Shell.NavBarIsVisible="false">
<ContentPage.BindingContext>
<viewModels:ParkingSistemiViewModel />
</ContentPage.BindingContext>
<ScrollView>
<StackLayout>
<!-- Header Stranice -->
<StackLayout BackgroundColor="#744fa0" Padding="20,40,20,20">
<Button x:Name="odjavaBtn"
HorizontalOptions ="End"
WidthRequest="100"
FontSize="16"
FontAttributes="Bold"
Text="ODJAVA"
FontFamily="Bahnschrift"
Clicked="OnOdjavaClicked"
Margin="0,0,0,20"/>
<Label Text="PAMETNI PARKING"
FontSize="25"
FontAttributes="Bold"
FontFamily="Bahnschrift"
VerticalOptions="Center"
HorizontalOptions="Start" FontAutoScalingEnabled="False" />
<Label Text="Pregled dostupnih sistema"
VerticalOptions="Center"
FontFamily="Bahnschrift"
HorizontalOptions="Start" />
</StackLayout>
<!-- Body Stranice (Lista svih Sistema)-->
<CollectionView x:Name="listaParkingSistema" SelectionMode="Single" SelectionChanged="OpenElement">
<CollectionView.ItemTemplate>
<DataTemplate>
<Border StrokeShape="RoundRectangle 20"
Padding="5"
Margin="20,5,20,0"
BackgroundColor="White">
<Grid BackgroundColor="White">
<Grid.RowDefinitions>
<RowDefinition Height="30"/>
<RowDefinition Height="30"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="60"/>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="60"/>
</Grid.ColumnDefinitions>
<Image Source="parking.png"
Grid.RowSpan="2"
Grid.Column="0"
HorizontalOptions="CenterAndExpand"
VerticalOptions="CenterAndExpand"/>
<Label x:Name="Additional"
Margin="10,0,0,0"
Text="{Binding DodatniNaziv}"
FontSize="15"
FontFamily="Bahnschrift"
HorizontalTextAlignment="Start"
VerticalTextAlignment="Center"
TextColor="#404040"
Grid.Row="0"
Grid.Column="1"/>
<Label x:Name="Title"
Margin="10,0,0,0"
Text="{Binding Naziv}"
FontSize="20"
FontFamily="Bahnschrift"
FontAttributes="Bold"
CharacterSpacing="1"
HorizontalTextAlignment="Start"
VerticalTextAlignment="Center"
TextColor="#404040"
Grid.Row="1"
Grid.Column="1"/>
<Image x:Name="StatusBtn"
Source="{Binding Connection}"
Grid.RowSpan="2"
Grid.Column="2"
HorizontalOptions="CenterAndExpand"
VerticalOptions="CenterAndExpand"/>
</Grid>
</Border>
</DataTemplate>
</CollectionView.ItemTemplate>
</CollectionView>
</StackLayout>
</ScrollView>
</ContentPage>
2.) 背后的代码：
namespace ProjectName.Views;
public partial class MainDashboard : ContentPage
{
public MainDashboard()
{
InitializeComponent();
}
//Metoda koja odjavljuje korisnika sa aplikacije
private async void OnOdjavaClicked(object sender, EventArgs e)
{
await Navigation.PopAsync();
}
//Metoda koja Vodi na sljedeci screen
private async void OpenElement(object sender, SelectionChangedEventArgs e)
{
await Navigation.PushAsync(new ParkingSistemDashboard());
3.) ViewModel 类
using ProjectName.Entities;
using CommunityToolkit.Mvvm.ComponentModel;
using System.Collections.ObjectModel;
namespace ProjectName.ViewModels
{
class ParkingSistemiViewModel : ObservableObject
{
private ObservableCollection<ParkingSistemiModel> _parkingSitemi;
public ObservableCollection<ParkingSistemiModel> ParkingSitemi
{
get => _parkingSitemi;
set => SetProperty(ref _parkingSitemi, value);
}
public ParkingSistemiViewModel()
{
ParkingSitemi = new ObservableCollection<ParkingSistemiModel>
{
new ParkingSistemiModel{ParkingId = Guid.Parse("5177bbc1-c96a-473b-af8b-fc4a5bc7ed91"), Naziv = "Test Parking 1", DodatniNaziv = "Najbolji Parking mjkm", Ip = "8.8.8.8"},
new ParkingSistemiModel{ParkingId = Guid.Parse("43cde37a-c097-4eee-b320-1a5edd30ffe8"), Naziv = "Test Parking 2", DodatniNaziv = "Najbolji Parking mjkm", Ip = "8.8.8.8"},
new ParkingSistemiModel{ParkingId = Guid.Parse("810c76c7-094f-4d92-8c31-ec9a98415678"), Naziv = "Test Parking 3", DodatniNaziv = "Najbolji Parking mjkm", Ip = "8.8.8.8"},
new ParkingSistemiModel{ParkingId = Guid.Parse("276431a4-6f70-4b64-9520-fd42110a790c"), Naziv = "Test Parking 4", DodatniNaziv = "Najbolji Parking mjkm", Ip = "8.8.8.8"},
new ParkingSistemiModel{ParkingId = Guid.Parse("1debd0c6-0fb0-4bc7-b324-5b15ad185b40"), Naziv = "Test Parking 5", DodatniNaziv = "Najbolji Parking mjkm", Ip = "0.0.0.0"},
new ParkingSistemiModel{ParkingId = Guid.Parse("11a58136-2058-4194-8e48-c3e64de90088"), Naziv = "Test Parking 6", DodatniNaziv = "Najbolji Parking mjkm", Ip = "8.8.8.8"},
new ParkingSistemiModel{ParkingId = Guid.Parse("14f1e1fb-db63-4b8d-9601-f99988890467"), Naziv = "Test Parking 7", DodatniNaziv = "Najbolji Parking mjkm", Ip = "8.8.8.8"},
new ParkingSistemiModel{ParkingId = Guid.Parse("8a6d818e-8839-43a9-9bed-e0afae0c38c1"), Naziv = "Test Parking 8", DodatniNaziv = "Najbolji Parking mjkm", Ip = "8.8.8.8"},
new ParkingSistemiModel{ParkingId = Guid.Parse("56b610e4-bb71-49b8-b0f7-444a6c6b2f53"), Naziv = "Test Parking 9", DodatniNaziv = "Najbolji Parking mjkm", Ip = "8.8.8.8"},
};
}
}
}
4.) 模型类
using System.Net.NetworkInformation;
namespace ProjectName.Entities
{
public class ParkingSistemiModel
{
public Guid ParkingId { get; set; }
public string Naziv { get; set; }
public string DodatniNaziv { get; set; }
public string Ip { get; set; }
public string Connection { get; private set; }
public ParkingSistemiModel()
{
Connection = CheckConnection();
}
//Method that is used to check the connection to the server
public string CheckConnection()
{
if (string.IsNullOrWhiteSpace(Ip))
{
return "cancel.png";
}
using (Ping ping = new Ping())
{
try
{
PingReply reply = ping.Send(Ip);
return reply.Status == IPStatus.Success
? "checked.png"
: "cancel.png";
}
catch
{
return "cancel.png";
}
}
}
}
}
诚实不知道从哪里开始
如果您不打算动态添加/删除项目，您可以这样做：
[ObservableProperty]
List<ParkingSistemiModel> _parkingSitemi;
（这将自动生成 ParkingSitemi，您可以重新分配）
ItemsSource={Binding ParkingSitemi}（这告诉您的集合视图显示此列表）
x:DataType="ParkingSistemiModel"（这表明集合视图的每个“行”正在显示 ParkingSistemiModel 类型的对象）
您应该在页面事件中执行此操作。我的理解是，普遍的共识是，这是“OnNavigedTo”事件。但页面生命周期的其他事件也是可以接受的。 （在某种程度上，它们不会导致页面构建过程中繁重操作导致的相同问题）