DataGrid的自动行列显示

新建wpf页面DataGridAutoView

引用空间： xmlns:ga="clr-namespace:WPFDemoMVVM.Helpers"

		<Window x:Class="WPFDemoMVVM.View.DataGridAutoView"
				xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
				xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
				xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
				xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
				xmlns:local="clr-namespace:WPFDemoMVVM.View"
				xmlns:ga="clr-namespace:WPFDemoMVVM.Helpers"
				mc:Ignorable="d"
				Title="DataGridAutoView" Height="450" Width="800">
			<Grid>

				<Grid ga:GridAssist.AutoRowColumn="_,2">
					<Grid.Resources>
						<Style TargetType="Label" BasedOn="{StaticResource {x:Type Label}}">
							<Setter Property="VerticalContentAlignment" Value="Center"></Setter>
							<Setter Property="Width" Value="120"></Setter>
							<Setter Property="Height" Value="40"></Setter>
						</Style>
						<Style TargetType="TextBox" BasedOn="{StaticResource {x:Type TextBox}}">
							<Setter Property="VerticalAlignment" Value="Center"></Setter>
							<Setter Property="Width" Value="180"></Setter>
						</Style>
					</Grid.Resources>


					<Label Content="IP Address"></Label>
					<TextBox Text="127.0.0.1"></TextBox>

					<Label Content="Port"></Label>
					<TextBox Text="8080"></TextBox>

					<Label Content="TimeOut"></Label>
					<TextBox Text="10000"></TextBox>

				</Grid>


			</Grid>
		</Window>

新建一个类GridAssist

在命名空间clr-namespace:WPFDemoMVVM.Helpers下，新建GridAssist类

		static class GridAssist
		{
			#region AutoRowColumn

			public static string GetAutoRowColumn(DependencyObject obj)
			{
				return (string)obj.GetValue(AutoRowColumnProperty);
			}

			public static void SetAutoRowColumn(DependencyObject obj, string value)
			{
				obj.SetValue(AutoRowColumnProperty, value);
			}

			/// <summary>
			/// 自动排列 Grid 容器中的所有控件
			/// </summary>
			/// <remarks>
			/// 值为一个逗号隔开的字符串，形如：<br/>
			/// - 2,3（2 行 3 列，列宽默认为 1*，行高为 Auto）<br/>
			/// - _,3（3 列，行数根据子控件而定）<br/>
			/// - 2,3,Auto（列的宽度为 Auto）<br/>
			/// Grid 中的所有控件将自动按照从左到右、从上到下的顺序进行排列<br/>
			/// 控件各自的 RowSpan 以及 ColumnSpan 也会被考虑
			/// </remarks>
			/// <example>
			/// <code>
			/// <![CDATA[
			/// <Window xmlns:ap="clr-namespace:NemoDemo.AttachedProperties">
			///     <Grid ap:GridHelper.AutoRowColumn="2,3">
			///         <Button />                     // 1,1
			///         <Label />                      // 1,2
			///         <TextBox />                    // 1,3
			///         <Button />                     // 2,1
			///         <Label Grid.ColumnSpan="2" />  // 2,2-3
			///     </Grid>
			/// </Window>
			/// ]]>
			/// </code>
			/// </example>
			public static readonly DependencyProperty AutoRowColumnProperty = DependencyProperty.RegisterAttached(
				"AutoRowColumn",
				typeof(string),
				typeof(GridAssist),
				new FrameworkPropertyMetadata("", FrameworkPropertyMetadataOptions.AffectsMeasure, OnAutoRowColumnChanged)
			);

			private static void OnAutoRowColumnChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
			{
				if (!(d is Grid grid))
					return;

				var value = e.NewValue as string;
				if (string.IsNullOrEmpty(value))
				{
					grid.RowDefinitions.Clear();
					grid.ColumnDefinitions.Clear();

					grid.Loaded -= OnGridLoaded;
					return;
				}

				grid.Loaded += OnGridLoaded;

				if (grid.IsLoaded)
					OnGridLoaded(grid, null);
			}

			private static void OnGridLoaded(object sender, RoutedEventArgs e)
			{
				var grid = sender as Grid;

				// 列宽，默认为 Star，即平均分布
				var width = new GridLength(1.0, GridUnitType.Star);
				var split = GridAssist.GetAutoRowColumn(grid).Split(',');
				var r = split[0] != "_" ? int.Parse(split[0]) : 1;
				var c = int.Parse(split[1]);
				// 如果有第三个参数且值为 auto，则宽度为 Auto
				if (split.Length == 3 && split[2].Equals("auto", StringComparison.OrdinalIgnoreCase))
					width = GridLength.Auto;
				grid.RowDefinitions.Clear();
				grid.ColumnDefinitions.Clear();
				for (int i = 0; i < r; i++)
					grid.RowDefinitions.Add(new RowDefinition { Height = GridLength.Auto });
				for (int i = 0; i < c; i++)
					grid.ColumnDefinitions.Add(new ColumnDefinition { Width = width });

				var cols = grid.ColumnDefinitions.Count;

				var map = new List<bool[]>();

				int x = 0,
					y = 0;
				foreach (UIElement item in grid.Children)
				{
					var rowSpan = Grid.GetRowSpan(item);
					var colSpan = Grid.GetColumnSpan(item);

					// 默认从上到下，从左到右，即任何时候控件的下方和右方都是空的
					// 可能会出现中途有一个 RowSpan > 1 导致其左下方的右侧不为空的情况，暂不处理
					// 同时默认当前的 (x, y) 位置是一个可用位置

					// 当前控件占据的格子
					for (int i = 0; i < rowSpan; i++)
					{
						// 如果 RowDefinition 不够用，则自动添加
						if (map.Count <= y + i)
						{
							while (map.Count <= y + i)
							{
								grid.RowDefinitions.Add(new RowDefinition { Height = GridLength.Auto });
								map.Add(new bool[cols]);
							}
						}

						map[y + i][x] = true;
					}

					for (int i = 0; i < colSpan; i++)
					{
						if (x + i >= cols)
							break;
						map[y][x + i] = true;
					}

					Grid.SetRow(item, y);
					Grid.SetColumn(item, x);

					// 寻找下一个可用的格子
					while (map[y][x])
					{
						x++;
						if (x >= cols)
						{
							x = 0;
							y++;
							if (y >= map.Count)
							{
								grid.RowDefinitions.Add(new RowDefinition { Height = GridLength.Auto });
								map.Add(new bool[cols]);
							}
						}
					}
				}
			}

			#endregion
		}

wpf项目：https://gitee.com/chenshibao/wpfdemo