Avalonia TreeDataGrid 示例代码

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

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

参考文档3，中文版
https://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<TextBlock Text="{Binding Greeting}" HorizontalAlignment="Center" VerticalAlignment="Center"/> ，

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

三，在App.axaml里添加data grid样式
<Application.Styles>
<FluentTheme/>
<StyleInclude
Source="avares://Avalonia.Controls.TreeDataGrid/Themes/Fluent.axaml"/>
</Application.Styles>

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<Person> 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<Person> _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<Person>(_people)
{
Columns =
{
new HierarchicalExpanderColumn<Person>(
new TextColumn<Person, string>("First Name", x => x.FirstName),
x => x.Children),
new TextColumn<Person, string>("Last Name", x => x.LastName),
new TextColumn<Person, int>("Age", x => x.Age),
},
};
}

public HierarchicalTreeDataGridSource<Person> Source { get; }

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

3,MainWindow.axaml

</Window>

4,App.axaml

<Application.DataTemplates>
<local:ViewLocator/>
</Application.DataTemplates>

<Application.Styles>
<FluentTheme />
<StyleInclude
Source="avares://Avalonia.Controls.TreeDataGrid/Themes/Fluent.axaml"/>
</Application.Styles>
</Application>

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