效果图：
添加扩展类
public static class DataGridExtend
{
/// <summary>
/// 获取DataGrid控件单元格
/// </summary>
/// <param name="dataGrid">DataGrid控件</param>
/// <param name="rowIndex">单元格所在的行号</param>
/// <param name="columnIndex">单元格所在的列号</param>
/// <returns>指定的单元格</returns>
public static DataGridCell GetCell(this DataGrid dataGrid, int rowIndex, int columnIndex)
{
DataGridRow rowContainer = dataGrid.GetRow(rowIndex);
if (rowContainer != null)
{
DataGridCellsPresenter presenter = GetVisualChild<DataGridCellsPresenter>(rowContainer);
DataGridCell cell = (DataGridCell)presenter.ItemContainerGenerator.ContainerFromIndex(columnIndex);
if (cell == null)
{
dataGrid.ScrollIntoView(rowContainer, dataGrid.Columns[columnIndex]);
cell = (DataGridCell)presenter.ItemContainerGenerator.ContainerFromIndex(columnIndex);
}
return cell;
}
return null;
}
/// <summary>
/// 获取DataGrid的行
/// </summary>
/// <param name="dataGrid">DataGrid控件</param>
/// <param name="rowIndex">DataGrid行号</param>
/// <returns>指定的行号</returns>
public static DataGridRow GetRow(this DataGrid dataGrid, int rowIndex)
{
DataGridRow rowContainer = (DataGridRow)dataGrid.ItemContainerGenerator.ContainerFromIndex(rowIndex);
if (rowContainer == null)
{
dataGrid.UpdateLayout();
dataGrid.ScrollIntoView(dataGrid.Items[rowIndex]);
rowContainer = (DataGridRow)dataGrid.ItemContainerGenerator.ContainerFromIndex(rowIndex);
}
return rowContainer;
}
/// <summary>
/// 获取父可视对象中第一个指定类型的子可视对象
/// </summary>
/// <typeparam name="T">可视对象类型</typeparam>
/// <param name="parent">父可视对象</param>
/// <returns>第一个指定类型的子可视对象</returns>
public static T GetVisualChild<T>(Visual parent) where T : Visual
{
T child = default(T);
int numVisuals = VisualTreeHelper.GetChildrenCount(parent);
for (int i = 0; i < numVisuals; i++)
{
Visual v = (Visual)VisualTreeHelper.GetChild(parent, i);
child = v as T;
if (child == null)
{
child = GetVisualChild<T>(v);
}
if (child != null)
{
break;
}
}
return child;
}
}
用法：
var cell = grid.GetCell(2,3);
if (cell != null)
{
cell.IsEnabled = false;
cell.Background = Brushes.LightGray;
}
以上是设置datagrid第三行第四列单元格的背景色和Enable属性。