我有一个类“CellularInfo”,我试图在可观察集合中显示项目,但绑定(bind)了Rssi
、Rsrp
和Rsrq
未显示。
我知道 LTEInfo 正在 CellularInfo.xaml.cs 中填充,但它没有绑定(bind)。
Cellularinfo.xaml:
<?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:local="clr-namespace:CellularSignal1"
x:Class="CellularSignal1.CellularInfo"
Title="Signal">
<VerticalStackLayout>
<ListView BackgroundColor="Red" ItemsSource="{x:Reference lteStrengths}">
<ListView.ItemTemplate>
<DataTemplate>
<Grid>
<Grid.RowDefinitions>
<RowDefinition/>
<RowDefinition/>
<RowDefinition/>
</Grid.RowDefinitions>
<Label Grid.Row="0" Text="{Binding Rssi}" HeightRequest="50"/>
<Label Grid.Row="1" Text="{Binding Rsrp}" HeightRequest="50"/>
<Label Grid.Row="2" Text="{Binding Rsrq}" HeightRequest="50"/>
</Grid>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</VerticalStackLayout>
</ContentPage>
CellularInfo.xaml.cs:
namespace CellularSignal1;
using Android.Content;
using Android.OS;
using Android.Telephony;
using Java.Util.Logging;
using Microsoft.Maui.Controls;
using Microsoft.Maui.Controls.Internals;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;
public partial class CellularInfo : ContentPage
{
public ObservableCollection<LTEInfo> lteStrengths { get; set; } = new ObservableCollection<LTEInfo>();
public CellularInfo()
{
InitializeComponent();
}
protected override async void OnAppearing()
{
addSignalStrengths();
}
public void addSignalStrengths()
{
LTEInfo lte = new LTEInfo
{
Rssi = 3,
Rsrp = 2,
Rsrq = 7,
Level = 8
};
lteStrengths.Add(lte);
}
}
LTEInfo.cs:
using CommunityToolkit.Mvvm.ComponentModel;
namespace CellularSignal1
{
public class LTEInfo : ObservableObject
{
public int Rssi { get; set; }
public int Rsrp { get; set; }
public int Rsrq { get; set; }
public int Level { get; set; }
}
}
最佳答案
将您的ItemsSource
更改为
<ListView BackgroundColor="Red" ItemsSource="{Binding lteStrengths}">
并在构造函数中设置您的BindingContext
public CellularInfo()
{
InitializeComponent();
BindingContext = this;
}
关于c# - .NET MAUI - 为什么绑定(bind)不能与 ObservableCollection 一起使用?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/75636558/