Question

wpf,在不知道DataGrid绑定类型的基础上，如何获得DataGrid上显示的值。

在用DataGrid.ItemsSource绑定类型时，DataGrid会显示相应的值，
但当我不知道绑定的类型时，如何获得DataGrid上显示的值？

Answer 1

    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            Items = new ObservableCollection<C>();
            Items.Add(new C("a1","b1"));
            Items.Add(new C("a2", "b2"));
            Items.Add(new C("a3", "b3"));
            DataContext = this;
        }

        public ObservableCollection<C> Items
        { get; set; }

        //不建议这样做，但是确实可以实现
        private void button1_Click(object sender, RoutedEventArgs e)
        {
            //获取0,0的显示的内容，前提是单元格列是DataGridTextColumn
            DataGridCell c = DataGridHelper.GetCell(dataGrid1, 0, 0);
            TextBlock tb=c.Content as TextBlock;
            MessageBox.Show(tb.Text);
        }
    }

    public class C
    {
        public C(string a, string b)
        {
            A = a;
            B = b;
        }
        public string A { get; set; }
        public string B { get; set; }
    }

    static class DataGridHelper
    {
        static public DataGridCell GetCell(DataGrid dg, int row, int column)
        {
            DataGridRow rowContainer = GR(dg, row);

            if (rowContainer != null)
            {
                DataGridCellsPresenter p = GC<DataGridCellsPresenter>(rowContainer);

                DataGridCell cell = (DataGridCell)p.ItemContainerGenerator.ContainerFromIndex(column);
                if (cell == null)
                {
                    dg.ScrollIntoView(rowContainer, dg.Columns[column]);
                    cell = (DataGridCell)p.ItemContainerGenerator.ContainerFromIndex(column);
                }
                return cell;
            }
            return null;
        }

        static public DataGridRow GR(DataGrid dg, int index)
        {
            DataGridRow r = (DataGridRow)dg.ItemContainerGenerator.ContainerFromIndex(index);
            if (r == null)
            {
                dg.ScrollIntoView(dg.Items[index]);
                r = (DataGridRow)dg.ItemContainerGenerator.ContainerFromIndex(index);
            }
            return r;
        }

        static T GC<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 = GC<T>(v);
                }
                if (child != null)
                {
                    break;
                }
            }
            return child;
        }
    }

Answer 2

获取 dataGrid.CurrentItem.GetType()，然后使用反射 System.Reflection

下面用字符串做个示例

var data = "abcdefghijklmnopqrstuvwxyz";

var type = data.GetType();

foreach (var pi in type.GetProperties())
{
    // 获取属性参数数组
    var parms = pi.GetIndexParameters(); 

    // 判断是否为数组类型的属性 ( parms > 0)
    if (parms.Length == 0)
    {
        Console.WriteLine("{0},{1},{2}",
            pi.Name, pi.PropertyType, pi.GetValue(data, null));
    }
    else
    {
        var names = parms.Select(s => s.Name).ToArray();

        Console.WriteLine("{0},{1},{2}",
            pi.Name, pi.PropertyType, string.Join(",", names));
    }
}