WPF-如何从DataGridRow获取单元格？ [英] WPF - How to get a cell from a DataGridRow?

问题描述

我有一个数据绑定的DataGrid，它具有交替的行背景色。我想根据单元格包含的数据对单元格进行不同的着色。我已经尝试过该线程建议的解决方案

I have a data-bound DataGrid with alternating row background colors. I would like to color a cell differently based on the data it contains. I have tried the solution suggested by this thread

http://wpf.codeplex.com/Thread/View.aspx?ThreadId=51143

但是，

DataGridCellsPresenter presenter = GetVisualChild（row）

DataGridCellsPresenter presenter = GetVisualChild(row)

总是返回null。

我正在使用

    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;
    }

但是DataGridRow的VisualTreeHelper.GetChildrenCount（）始终返回0。我已经验证DataGridRow不为null，并且已经填充了数据。

But VisualTreeHelper.GetChildrenCount() of a DataGridRow always returns 0. I have verified that DataGridRow is not null and has been populated with data already. Any help is appreciated.

谢谢。

推荐答案

您要访问的单元格的行和索引，然后在代码中执行以下操作：

If you know your row and index of the cell you'd like to access, then here's how you can do it in code:

//here's usage
var cell = myDataGrid.GetCell(row, columnIndex);
if(cell != null)
    cell.Background = Brushes.Green;

DataGrid扩展名：

DataGrid Extension:

public static class DataGridExtensions
{
    public static DataGridCell GetCell(this DataGrid grid,  DataGridRow row, int columnIndex = 0)
    {
        if (row == null) return null;

        var presenter = row.FindVisualChild<DataGridCellsPresenter>();
        if (presenter == null) return null;

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

        // now try to bring into view and retreive the cell
        grid.ScrollIntoView(row, grid.Columns[columnIndex]);
        cell = (DataGridCell)presenter.ItemContainerGenerator.ContainerFromIndex(columnIndex);

        return cell;
    }

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