C# WPF从后台代码生成行列可变的表格

z概述

WPF常用的表格控件是DataGrid，这个控件在前台XAML编写的话，一般列已经固定，然后给每个列去绑定数据，但是如果我的列不固定，随着运算结果变动呢？这时候DataGrid，就比较难实现这个需求，这节我就从后台代码去添加控件去实现这个功能.

效果演示

实现方法

-. 前台XAML:

<dxlc:LayoutControl><Grid HorizontalAlignment="Left" VerticalAlignment="Top" cal:Message.Attach="[Event Loaded]=[Grid_Loaded($source,$eventArgs)]" /></dxlc:LayoutControl>

这里我把grid放到了dxlc:LayoutControl中，这样可以实现grid尺寸超出界面分配的长宽时，横纵出现滑动条：如下图

-.后台代码：

数据模型：

public class WidthMetrologyDTO{/// <summary>/// /// </summary>public bool IsMeasureSuccess { get; set; }/// <summary>/// /// </summary>public double Degree { get; set; }/// <summary>/// /// </summary>public string ImageFilePath { get; set; }/// <summary>/// /// </summary>public double Width { get; set; }public double EdgeNum { get; set; }public List<EdgePosition> EdgePositions { get; set; }}public class EdgePosition{public double EdgesAmplitude { get; set; }}

①定义grid以及数据集合：

public Grid resultDisplayGrid;public BindableCollection<WidthMetrologyDTO> WidthMetrologyData { get; set; }= new BindableCollection<WidthMetrologyDTO>();

②控件加载时获取grid对象：

public void Grid_Loaded(object sender, RoutedEventArgs e){resultDisplayGrid = (Grid)sender;}

③添加数据集合：

public void ResultDispaly(){try{WidthMetrologyData.Clear();WidthMetrologyData.Add(new WidthMetrologyDTO{Width = 345.1,EdgeNum = 3,EdgePositions = new List<EdgePosition>{new EdgePosition(){EdgesAmplitude = 1.1},new EdgePosition(){EdgesAmplitude = 2.2},new EdgePosition(){EdgesAmplitude = 3.3},},});WidthMetrologyData.Add(new WidthMetrologyDTO{Width = 345.2,EdgeNum = 2,EdgePositions = new List<EdgePosition>{new EdgePosition(){EdgesAmplitude = 4.4},new EdgePosition(){EdgesAmplitude = 5.5},},});WidthMetrologyData.Add(new WidthMetrologyDTO{Width = 345.3,EdgeNum = 4,EdgePositions = new List<EdgePosition>{new EdgePosition(){EdgesAmplitude = 6.6},new EdgePosition(){EdgesAmplitude = 7.7},new EdgePosition(){EdgesAmplitude = 8.8},new EdgePosition(){EdgesAmplitude = 9.9},},});WidthMetrologyData.Add(new WidthMetrologyDTO{Width = 345.0,EdgeNum = 1,EdgePositions = new List<EdgePosition>{new EdgePosition(){EdgesAmplitude = 0.66},},});AddResultGrid();}catch (Exception ex){//logger.Debug($"ResultData add fail : {ex}");}}

④数据表格生成

public void AddResultGrid(){try{resultDisplayGrid.Children.Clear();var gridColumns = 2 + WidthMetrologyData.OrderByDescending(index => index.EdgePositions.Count).FirstOrDefault().EdgePositions.Count;var gridRows = 16;//添加grid行for (int i = 0; i < gridColumns; i++){var columnDefinition = new ColumnDefinition();resultDisplayGrid.ColumnDefinitions.Add(columnDefinition);if (i == 1){columnDefinition.Width = new GridLength(2, GridUnitType.Star);//相对尺寸}else{columnDefinition.Width = new GridLength(1, GridUnitType.Star);}//columnDefinition.Width = GridLength.Auto;}//添加grid列for (int i = 0; i < gridRows; i++){var rowDefinition = new RowDefinition();resultDisplayGrid.RowDefinitions.Add(rowDefinition);rowDefinition.Height = new GridLength(30, GridUnitType.Pixel);//绝对尺寸}//添加数据//var controlWidth = 100;//var controlHeight = 30;for (int degreeIndex = 0; degreeIndex < WidthMetrologyData.Count; degreeIndex++){var rowsCount = 3;var columnsCount = WidthMetrologyData[degreeIndex].EdgePositions.Count;for (int row = 0; row < rowsCount; row++)for (int column = 0; column < columnsCount + 2; column++){TextBlock tb = new TextBlock();//tb.Width = controlWidth;//tb.Height = controlHeight;//tb.HorizontalAlignment = HorizontalAlignment.Left;//tb.VerticalAlignment = VerticalAlignment.Center;Border border = new Border();border.BorderBrush = System.Windows.Media.Brushes.BlueViolet;border.BorderThickness = new Thickness(1);border.Child = tb;border.SetValue(Grid.RowProperty, row + degreeIndex * 4);border.SetValue(Grid.ColumnProperty, column);resultDisplayGrid.Children.Add(border);if (row == 0 && column >= 2){tb.Text = (column - 1).ToString();}else if (row == 1 && column >= 2){tb.Text = WidthMetrologyData[degreeIndex].EdgePositions[column - 2].EdgesAmplitude.ToString();}else if (row == 2 && column >= 2){if (column == 2){tb.Text = WidthMetrologyData[degreeIndex].Width.ToString();//tb.Width = columnsCount * controlWidth;tb.SetValue(Grid.ColumnSpanProperty, columnsCount);}else{continue;}}if (column == 0){if (row == 0){switch (degreeIndex){case 0:tb.Text = "第一组"; break;case 1:tb.Text = "第二组"; break;case 2:tb.Text = "第三组"; break;case 3:tb.Text = "第四组"; break;default: break;}//tb.Height = 3 * controlHeight;tb.SetValue(Grid.RowSpanProperty, 3);}else{continue;}}if (column == 1){switch (row){case 0:tb.Text = "ID"; break;case 1:tb.Text = "Value"; break;case 2:tb.Text = "Fraction"; break;default:tb.Text = string.Empty; break;}//tb.Width = controlWidth;}}}resultDisplayGrid.Width = (gridColumns + 1)* 40;//resultDisplayGrid.Height = gridRows * controlHeight;}catch (Exception ex){//logger.Error($"Add result  grid fail,{ex}");}}

解释：

-. grid添加行以及尺寸设置：ridUnitType.Pixel代表绝对尺寸，GridUnitType.Star相对尺寸

var rowDefinition = new RowDefinition();resultDisplayGrid.RowDefinitions.Add(rowDefinition);rowDefinition.Height = new GridLength(30, GridUnitType.Pixel);//绝对尺寸

自动尺寸：

columnDefinition.Width = GridLength.Auto;

-. link的使用：按照集合中EdgePositions数量降序排列后获取第一个列表值

WidthMetrologyData.OrderByDescending(index => index.EdgePositions.Count).FirstOrDefault().EdgePositions.Count;

-.生成控件并添加到grid中，并通过SetValue设置控件在grid中的行列位置

TextBlock tb = new TextBlock();//tb.Width = controlWidth;//tb.Height = controlHeight;//tb.HorizontalAlignment = HorizontalAlignment.Left;//tb.VerticalAlignment = VerticalAlignment.Center;Border border = new Border();border.BorderBrush = System.Windows.Media.Brushes.BlueViolet;border.BorderThickness = new Thickness(1);border.Child = tb;border.SetValue(Grid.RowProperty, row + degreeIndex * 4);border.SetValue(Grid.ColumnProperty, column);resultDisplayGrid.Children.Add(border);