WPF Datagrid控件，获取某一个单元格中的控件

在WPF应用程序中，比如需要获取特定 DataGrid 单元格中的 TextBlock 控件，可以通过访问 DataGridRow 和 DataGridCell 对象。以下是一个例子，展示如何获取 DataGrid 的第二行第一列中的 TextBlock 控件，并修改其属性。

1. 在XAML中定义DataGrid和Button

在XAML文件中定义一个 DataGrid 控件和一个 Button 控件，确保使用 DataGridTemplateColumn 来指定数据模板。

<Window x:Class="YourNamespace.MainWindow"xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"Title="MainWindow" Height="450" Width="800"><Grid><StackPanel><Button Content="Change Background Color" Click="ChangeBackgroundColor_Click" Margin="10"/><DataGrid x:Name="dataGrid" AutoGenerateColumns="False" Margin="10"><DataGrid.Columns><DataGridTemplateColumn Header="Column 1"><DataGridTemplateColumn.CellTemplate><DataTemplate><TextBlock Text="{Binding Column1}" /></DataTemplate></DataGridTemplateColumn.CellTemplate></DataGridTemplateColumn><DataGridTemplateColumn Header="Column 2"><DataGridTemplateColumn.CellTemplate><DataTemplate><TextBlock Text="{Binding Column2}" /></DataTemplate></DataGridTemplateColumn.CellTemplate></DataGridTemplateColumn><DataGridTemplateColumn Header="Column 3"><DataGridTemplateColumn.CellTemplate><DataTemplate><TextBlock Text="{Binding Column3}" /></DataTemplate></DataGridTemplateColumn.CellTemplate></DataGridTemplateColumn></DataGrid.Columns></DataGrid></StackPanel></Grid>
</Window>

2. 在后台代码中处理Button点击事件

在后台代码（C#）中，添加事件处理程序以在Button点击时获取第二行第一列的 TextBlock 并修改其背景色。

using System.Collections.Generic;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;namespace YourNamespace
{public partial class MainWindow : Window{public MainWindow(){InitializeComponent();// 填充示例数据dataGrid.ItemsSource = new List<Data>{new Data { Column1 = "Row1 Col1", Column2 = "Row1 Col2", Column3 = "Row1 Col3" },new Data { Column1 = "Row2 Col1", Column2 = "Row2 Col2", Column3 = "Row2 Col3" }};}private void ChangeBackgroundColor_Click(object sender, RoutedEventArgs e){// 获取第二行（索引为1）和第一列（索引为0）DataGridRow row = GetDataGridRow(1);if (row != null){DataGridCell cell = GetDataGridCell(row, 0);if (cell != null){// 获取单元格中的TextBlockTextBlock textBlock = FindChild<TextBlock>(cell);if (textBlock != null){textBlock.Background = Brushes.Red; // 设置背景色为红色}}}}private DataGridRow GetDataGridRow(int index){var row = (DataGridRow)dataGrid.ItemContainerGenerator.ContainerFromIndex(index);if (row == null){dataGrid.ScrollIntoView(dataGrid.Items[index]);row = (DataGridRow)dataGrid.ItemContainerGenerator.ContainerFromIndex(index);}return row;}private DataGridCell GetDataGridCell(DataGridRow row, int columnIndex){if (row != null){var presenter = FindChild<DataGridCellsPresenter>(row);if (presenter == null){row.ApplyTemplate();presenter = FindChild<DataGridCellsPresenter>(row);}var cell = (DataGridCell)presenter.ItemContainerGenerator.ContainerFromIndex(columnIndex);if (cell == null){row.ScrollIntoView(row.Item, dataGrid.Columns[columnIndex]);cell = (DataGridCell)presenter.ItemContainerGenerator.ContainerFromIndex(columnIndex);}return cell;}return null;}private T FindChild<T>(DependencyObject parent) where T : DependencyObject{for (int i = 0; i < VisualTreeHelper.GetChildrenCount(parent); i++){var child = VisualTreeHelper.GetChild(parent, i);if (child is T){return (T)child;}var result = FindChild<T>(child);if (result != null){return result;}}return null;}}public class Data{public string Column1 { get; set; }public string Column2 { get; set; }public string Column3 { get; set; }}
}