xamarin BindingContext 與 ViewModel

Question

我有數據綁定問題我有一個標簽頁包含兩個標簽聊天和組。

<TabbedPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="bashal.MainPage" Title="Bashal"
             xmlns:local="clr-namespace:bashal.Views"
             xmlns:xct="http://xamarin.com/schemas/2020/toolkit"
            
             xmlns:android="clr-namespace:Xamarin.Forms.PlatformConfiguration.AndroidSpecific;assembly=Xamarin.Forms.Core"
            
            android:TabbedPage.ToolbarPlacement="Bottom" >


    <local:chatPage Title="chats" />
    <local:groupsPage Title="Groups" NavigationPage.HasBackButton="False" />




</TabbedPage>

第一個名為聊天的選項卡包含此頁面。

<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"  x:Class="bashal.Views.chatPage"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" xmlns:ViewModels="clr-namespace:bashal.ViewModels" 
             Title="home" >
    
    <ContentPage.BindingContext>
        <ViewModels:chatPageViewModel/>
    </ContentPage.BindingContext>
    
        
        <StackLayout>
            <CollectionView 
                >
                <CollectionView.ItemTemplate>
                    <DataTemplate>
                    <Label Text="{Binding name}"/>
                        
                </DataTemplate>
                </CollectionView.ItemTemplate>
            </CollectionView>

        </StackLayout>
</ContentPage>

我正在嘗試使用名為 vaiewModels 的文件夾中的 ViewModel class 進行數據綁定

namespace bashal.ViewModels
{
    class chatPageViewModel
    {   ObservableCollection<rooms> rooms;
        public chatPageViewModel()
        {
            rooms = new ObservableCollection<rooms>
            {
                new rooms {name = "user1", discrbtion= "welcome"},
                new rooms {name = "user2", discrbtion= "welcome"},
                new rooms {name = "user3", discrbtion= "welcome"},
                new rooms {name = "user4", discrbtion= "welcome"},
                new rooms {name = "user5", discrbtion= "welcome"},
                new rooms {name = "user6", discrbtion= "welcome"}
              

        };
             
        }
    }
}

這個房間 class

 public  class rooms
    {
        public string name { get; set; }
        public string discrbtion { get; set; }
    }

但數據沒有顯示我做錯了什么？ 提前致謝

Answer 1

首先，您需要分配一個ItemsSource

<CollectionView ItemSource="{Binding rooms}" >

你只能綁定到公共屬性，所以rooms需要是公共屬性

public ObservableCollection<rooms> rooms { get; set; }