显示网格中的按钮列表

Question

我试图创建一个按钮网格，每行显示5个按钮。我尝试使用nuget Xamarin.Forms.Datagrid。但它并没有真正起作用。我在部分单声道代码中获得空引用说错误。数据网格的工作方式对我来说很难理解。这是我的代码。

XAML

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="CashRegisterApp.Pages.InventoryPage"
             xmlns:dg="clr-namespace:Xamarin.Forms.DataGrid;assembly=Xamarin.Forms.DataGrid">
    <ContentPage.Content>
        <ScrollView>
            <dg:DataGrid ItemsSource="{Binding Buttons}" SelectionEnabled="True" RowHeight="250" Columns="5">
                <dg:DataGrid></dg:DataGrid>
            </dg:DataGrid>
        </ScrollView>
    </ContentPage.Content>
</ContentPage>

类

using System.Collections.Generic;
using System.ComponentModel;
using System.Runtime.CompilerServices;
using CashRegisterApp.Annotations;
using CashRegisterApp.Pages.Components;
using FreshMvvm;
using Xamarin.Forms;

namespace CashRegisterApp.ViewModels
{
    public class InventoryViewModel : FreshBasePageModel, INotifyPropertyChanged
    {
        private List<Button> _buttons;
        public List<Button> Buttons
        {
            get { return _buttons; }
            set { _buttons = value; OnPropertyChanged(nameof(Buttons)); }
        }

        public InventoryViewModel()
        {
            Buttons = LoadInventory();
        }
        public List<Button> LoadInventory()
        {
            var buttons = new List<Button>();

            buttons.Add(new AddFolderButton());
            buttons.Add(new AddItemButton());

            return buttons;
        }

        public void OnItemSelect()
        {

        }

        public new event PropertyChangedEventHandler PropertyChanged;

        [NotifyPropertyChangedInvocator]
        protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }
    }
}