private void Button_Click(objectsender, RoutedEventArgs e)

{

DataGridCell cell= dg.GetCell(1, 2);

TextBlock tb= cell.Content asTextBlock;

Console.WriteLine(tb.Text);

}public static classDataGridExtension

{///

///获取DataGrid控件单元格///

/// DataGrid控件

/// 单元格所在的行号

/// 单元格所在的列号

/// 指定的单元格

public static DataGridCell GetCell(this DataGrid dataGrid, int rowIndex, intcolumnIndex)

{

DataGridRow rowContainer=dataGrid.GetRow(rowIndex);if (rowContainer != null)

{

DataGridCellsPresenter presenter= GetVisualChild(rowContainer);

DataGridCell cell=(DataGridCell)presenter.ItemContainerGenerator.ContainerFromIndex(columnIndex);if (cell == null)

{

dataGrid.ScrollIntoView(rowContainer, dataGrid.Columns[columnIndex]);

cell=(DataGridCell)presenter.ItemContainerGenerator.ContainerFromIndex(columnIndex);

}returncell;

}return null;

}///

///获取DataGrid的行///

/// DataGrid控件

/// DataGrid行号

/// 指定的行号

public static DataGridRow GetRow(this DataGrid dataGrid, introwIndex)

{

DataGridRow rowContainer=(DataGridRow)dataGrid.ItemContainerGenerator.ContainerFromIndex(rowIndex);if (rowContainer == null)

{

dataGrid.UpdateLayout();

dataGrid.ScrollIntoView(dataGrid.Items[rowIndex]);

rowContainer=(DataGridRow)dataGrid.ItemContainerGenerator.ContainerFromIndex(rowIndex);

}returnrowContainer;

}///

///获取父可视对象中第一个指定类型的子可视对象///

/// 可视对象类型

/// 父可视对象

/// 第一个指定类型的子可视对象

public static T GetVisualChild(Visual parent) whereT : 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 asT;if (child == null)

{

child= GetVisualChild(v);

}if (child != null)

{break;

}

}returnchild;

}

}