WPF DataGrid 控件的运用

WPF DataGrid 控件的运用

运行环境：Window7 64bit，.NetFramework4.61，C# 6.0； 编者：乌龙哈里 2017-02-23

参考：

King Cobra 博客

流泉飞石 博客

董辉 百度知道答题

章节：

添加列和数据源

选择单位设置

自动添加行号

Enter 键做成 Tab 键的效果

同步更新数据源

在选中 Cell 所在行上插入新行或删除选中 Cell 的所在行

获取选中单元格的值

正文：

一、添加列和数据源：

我们往一个 DataGrid 中添加数据源 List< int[] >，注意要在 XAML 代码中把自动添加列的属性给设成 False， AutoGenerateColumns="False" 。

示例1：

C# 代码片段：

List<int[]> list = new List<int[]>();

list.Add(new int[] { 1, 2, 3, 4, 5 });

list.Add(new int[] { 2, 3, 4, 5, 6 });

list.Add(new int[] { 3, 4, 5, 6, 7 });

int _col = list[0].Length;

int _row = list.Count;

for (int i = 0; i < _col; i++)

{

dtgShow.Columns.Add(new DataGridTextColumn

{

Width = (Width - 30) / _col,

Header = $"{(char)(65+i)}",

Binding=new Binding($"[{i.ToString()}]")

});

}

dtgShow.ItemsSource = list;

前端 XAML 片段：

<DataGrid Name="dtgShow" AutoGenerateColumns="False" Margin="3" Grid.Row="0" Grid.ColumnSpan="2"/>

using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Data;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Input;

namespace 学习WpfDataGrid1
{
/// <summary>
/// MainWindow.xaml 的交互逻辑
/// </summary>
public partial class MainWindow : Window
{
List<int[]> list = new List<int[]>();
ObservableCollection<int[]> showdata = new ObservableCollection<int[]>();

public MainWindow()
{
InitializeComponent();
AddSource();
GetComboBoxSource();
GetShowData();
}
//---原始数据源到显示数据源
private void GetShowData()
{
showdata.Clear();
foreach (var a in list)
{
showdata.Add(a);
}
dtgShow.ItemsSource = showdata;
}
//---显示数据到原始数据
private void GetRawData()
{
list.Clear();
foreach (var a in showdata)
{
list.Add(a);
}
}
//---添加 ComboBox 数据源
private void GetComboBoxSource()
{
//cbbSelectMode 为 ComboBox 控件实例
cbbSelectMode.Items.Add(DataGridSelectionUnit.Cell);
cbbSelectMode.Items.Add(DataGridSelectionUnit.FullRow);
cbbSelectMode.Items.Add(DataGridSelectionUnit.CellOrRowHeader);
cbbSelectMode.SelectedIndex = 2;

}
//---DataGrid 选择方式
private void cbbSelectMode_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
dtgShow.SelectionUnit = (DataGridSelectionUnit)cbbSelectMode.SelectedValue;
}
//---添加 DataGrid 数据源
private void AddSource()
{
list.Add(new int[] { 1, 2, 3, 4, 5 });
list.Add(new int[] { 2, 3, 4, 5, 6 });
list.Add(new int[] { 3, 4, 5, 6, 7 });

int _col = list[0].Length;
//int _row = list.Count;
for (int i = 0; i < _col; i++)
{
dtgShow.Columns.Add(new DataGridTextColumn
{
Width = (Width - 38) / _col,
Header = $"{(char)(65 + i)}",
Binding = new Binding($"[{i.ToString()}]")
});
}
}
//---自动添加行号
private void dtgShow_LoadingRow(object sender, DataGridRowEventArgs e)
{
e.Row.Header = e.Row.GetIndex() + 1;
}
//---Enter 达到 Tab 的效果
private void dtgShow_PreviewKeyDown(object sender, KeyEventArgs e)
{
var uie = e.OriginalSource as UIElement;
if (e.Key == Key.Enter)
{
uie.MoveFocus(new TraversalRequest(FocusNavigationDirection.Next));
e.Handled = true;
}
}
//---给lbxData（ListBox） 添加数据
private void GetListBoxSource()
{
lbxData.Items.Clear();
StringBuilder sb = new StringBuilder();
foreach (var a in list)
{
sb.Clear();
foreach (var b in a)
{
sb.Append(b.ToString());
sb.Append(" ");
}
lbxData.Items.Add(sb.ToString());
}
}
//---切换 DataGrid 和 ListBox
private void chkResult_Click(object sender, RoutedEventArgs e)
{
CheckBox chk = (CheckBox)sender;
if (chk.IsChecked == true)
{
dtgShow.Visibility = Visibility.Hidden;
lbxData.Visibility = Visibility.Visible;
GetRawData();
GetListBoxSource();
}
else
{
lbxData.Visibility = Visibility.Hidden;
dtgShow.Visibility = Visibility.Visible;
GetShowData();
}
}
//增加新行
private void btnAppend_Click(object sender, RoutedEventArgs e)
{
showdata.Add(new int[dtgShow.Columns.Count]);
}
//删除末行
private void btnRemoveLast_Click(object sender, RoutedEventArgs e)
{
if (showdata.Count > 0)
{
showdata.RemoveAt(showdata.Count - 1);
}
}
//---取得选中 Cell 所在的行列
private bool GetCellXY(DataGrid dg, ref int rowIndex, ref int columnIndex)
{
var _cells = dg.SelectedCells;
if (_cells.Any())
{
rowIndex = dg.Items.IndexOf(_cells.First().Item);
columnIndex = _cells.First().Column.DisplayIndex;
return true;
}
return false;
}
//在选中 Cell 所在行上插入新行
private void btnInsert_Click(object sender, RoutedEventArgs e)
{
int _rowIndex = 0;
int _columnIndex = 0;
if (GetCellXY(dtgShow, ref _rowIndex, ref _columnIndex))
{
showdata.Insert(_rowIndex, new int[dtgShow.Columns.Count]);
}
}
//删除选中 Cell 所在行
private void btnRemoveSelect_Click(object sender, RoutedEventArgs e)
{
int _rowIndex = 0;
int _columnIndex = 0;
if (GetCellXY(dtgShow, ref _rowIndex, ref _columnIndex))
{
showdata.RemoveAt(_rowIndex);
}
}
//---获取所有的选中cell 的值
private string GetSelectedCellsValue(DataGrid dg)
{
var cells = dg.SelectedCells;
StringBuilder sb = new StringBuilder();
if (cells.Any())
{
foreach(var cell in cells)
{
sb.Append((cell.Column.GetCellContent(cell.Item) as TextBlock).Text);
sb.Append(" ");
}
}
return sb.ToString();
}
//---显示选中单元格的值
private void dtgShow_SelectedCellsChanged(object sender, SelectedCellsChangedEventArgs e)
{
tbxSelect.Text = GetSelectedCellsValue(dtgShow);
}
}
}

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