Avalonia TreeDataGrid 示例代码

参考文档1
http://docs.avaloniaui.net/docs/reference/controls/detailed-reference/treedatagrid/

参考文档2，英文版
http://avaloniachina.gitbook.io/avalonia/docs/controls/treedatagrid/creating-a-hierarchical-treedatagrid

参考文档3，中文版
http://pwangs-organization.gitbook.io/avaloniachinese/docs/controls/treedatagrid/creating-a-hierarchical-treedatagrid

一，新建一个avalonia MVVM工程AvaloniaAppTreeDataGrid，删掉MainWindow.xaml里的 ，

二，NuGet 安装TreeDataGrid（valonia.Controls.TreeDataGrid）

三，在App.axaml里添加data grid样式

   
    <StyleInclude 
        Source=”avares://Avalonia.Controls.TreeDataGrid/Themes/Fluent.axaml”/>

四，按照参考文档2，或参考文档3的操作，添加类或修改代码，

以下是修改后的相关代码

1, Person.cs

using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace AvaloniaAppTreeDataGrid.Models
{
    public class Person
    {
        public string? FirstName { get; set; }
        public string? LastName { get; set; }
        public int Age { get; set; }
        public ObservableCollection Children { get; } = new();
    }
}

2,MainWindowViewModel.cs

using Avalonia.Controls;
using Avalonia.Controls.Models.TreeDataGrid;
using AvaloniaAppTreeDataGrid.Models;
using System.Collections.ObjectModel;

namespace AvaloniaAppTreeDataGrid.ViewModels
{
    public class MainWindowViewModel : ViewModelBase
    {
#pragma warning disable CA1822 // Mark members as static
        //public string Greeting => “Welcome to Avalonia!”;

        private ObservableCollection _people = new()
    {
        new Person
        {
            FirstName = “Eleanor”,
            LastName = “Pope”,
            Age = 32,
            Children =
            {
                new Person { FirstName = “Marcel”, LastName = “Gutierrez”, Age = 4 },
            }
        },
        new Person
        {
            FirstName = “Jeremy”,
            LastName = “Navarro”,
            Age = 74,
            Children =
            {
                new Person
                {
                    FirstName = “Jane”,
                    LastName = “Navarro”,
                    Age = 42 ,
                    Children =
                    {
                        new Person { FirstName = “Lailah “, LastName = “Velazquez”, Age = 16 }
                    }
                },
            }
        },
        new Person { FirstName = “Jazmine”, LastName = “Schroeder”, Age = 52 },
    };

        public MainWindowViewModel()
        {
            Source = new HierarchicalTreeDataGridSource(_people)
            {
                Columns =
            {
                new HierarchicalExpanderColumn(
                    new TextColumn(“First Name”, x => x.FirstName),
                    x => x.Children),
                new TextColumn(“Last Name”, x => x.LastName),
                new TextColumn(“Age”, x => x.Age),
            },
            };
        }

        public HierarchicalTreeDataGridSource Source { get; }

#pragma warning restore CA1822 // Mark members as static
    }
}

3,MainWindow.axaml

<Window xmlns="http://github.com/avaloniaui"
        xmlns:x=”http://schemas.microsoft.com/winfx/2006/xaml”
        xmlns:vm=”using:AvaloniaAppTreeDataGrid.ViewModels”
        xmlns:d=”http://schemas.microsoft.com/expression/blend/2008″
        xmlns:mc=”http://schemas.openxmlformats.org/markup-compatibility/2006″
        mc:Ignorable=”d” d:DesignWidth=”800″ d:DesignHeight=”450″
        x:Class=”AvaloniaAppTreeDataGrid.Views.MainWindow”
        x:DataType=”vm:MainWindowViewModel”
        Icon=”/Assets/avalonia-logo.ico”
        Title=”AvaloniaAppTreeDataGrid”>
    
    
    
   
        <!– This only sets the DataContext for the previewer in an IDE,
             to set the actual DataContext for runtime, set the DataContext property in code (look at App.axaml.cs) –>
       
   

4,App.axaml

             xmlns:x=”http://schemas.microsoft.com/winfx/2006/xaml”
             x:Class=”AvaloniaAppTreeDataGrid.App”
             xmlns:local=”using:AvaloniaAppTreeDataGrid”
             RequestedThemeVariant=”Default”>
             

   
       
   
  
   
       
        <StyleInclude
        Source=”avares://Avalonia.Controls.TreeDataGrid/Themes/Fluent.axaml”/>