我在FireBase中做了一个应用程序来测试一些东西，实际上我创建了一个聊天应用程序。但是我想在我发送消息时看右边显示消息。如果我收到消息看左边。实际上我不需要复杂化。所以我有聊天用户。这个用户可以登录并加入聊天。
所以基本上我的聊天页面XAML：

<Grid>
    <Grid.RowDefinitions>
    <RowDefinition Height="4*"/>
    <RowDefinition Height="*"/>
        </Grid.RowDefinitions>

        
    <ListView Grid.Row="0" ItemsSource="{Binding .}" x:Name="_lstChat"
            SeparatorVisibility="None">
    <ListView.ItemTemplate>
    <DataTemplate>
    <TextCell Text="{Binding UserName}" Detail="{Binding UserMessage}" DetailColor="Fuchsia" />                 
    </DataTemplate>

            </ListView.ItemTemplate>
    </ListView>

    <Grid Grid.Row="1" RowSpacing="5">

    <Grid.ColumnDefinitions>
    <ColumnDefinition Width="3*"/>
    <ColumnDefinition Width="*"/>
    </Grid.ColumnDefinitions>

            
    <Entry Placeholder="Write Message .." Grid.Column="0" x:Name="_etMessage"/>
    <Button Text="Send!" Grid.Column="1" Clicked="Button_Clicked"/>
    </Grid>
</Grid>

我不需要使用TextCell，我只需要左右位置。

public partial class ChattingPage : ContentPage
{
    Scripts.FireBase db = new Scripts.FireBase();
    Model.Room rm = new Model.Room();
    public ChattingPage()
    {
        InitializeComponent();
        if (Preferences.Get("AdminCheck", string.Empty)== "1")
        {
            MessagingCenter.Subscribe<ChatPage, Model.Room>(this, "RoomProp", async (page, data) =>
            {
                rm = data;

                _lstChat.BindingContext = await db.subChat(data.Name);
                

                MessagingCenter.Unsubscribe<ChatPage, Model.Room>(this, "RoomProp");

            });
        }else
        {
            SubList();
        }

    }

    void Button_Clicked(System.Object sender, System.EventArgs e)
    {
        var chatOBJ = new Model.Chat { UserMessage = _etMessage.Text, UserName = Preferences.Get("RandomText", string.Empty) };
        if(Preferences.Get("AdminCheck", string.Empty) == "1")
        {
            db.saveMessage(chatOBJ, rm.Name);
        }
        else
        {
            db.saveMessage(chatOBJ, Preferences.Get("RandomText", string.Empty));
        }

        _etMessage.Text = "";

    }

    async void SubList()
    {
        _lstChat.BindingContext = await db.subChat(Preferences.Get("RandomText", string.Empty));
    }
}