0

有没有办法直接访问和操作指定 DataGrid 中的 DataGridCell？C# Visual Studio 2015 社区

我想访问特定的 DataGridCells，最好使用行和列，验证内容并更改一些属性。一旦我可以到达牢房，我就可以完成所有的工作。我一直在使用 VisualTreeHelper，几乎可以到达那里。我写“几乎”是因为由于某种原因，如果我在两个步骤之间插入 MessageBox.Show() 一切正常，除了我有一个我不想要的消息框。具体来说，我正在用一组数据填充数据网格，并希望更改每个单元格的背景和前景，这些单元格的数据与另一组匹配。

我在使用消息框、控制台写入以及本地和监视变量之间进行调试。我发现没有消息框，我的 DataGridRowPresenter 显示 0 个孩子并且我的条件失败。如果我删除条件，它会抛出一个索引越界异常。如果我有消息框，它会在消息框之前显示 0 个子节点，在消息框之后显示 2 个子节点（这对我的测试数据来说是正确的），并且该方法的其余部分继续执行并完全按照我的意愿执行。

我可以做些什么（除了消息框）来允许正确遍历树吗？或者，最好有一种更简单的方法可以直接进入我想要操作的单元格？如果我可以选择 DataGridViewer 而不是 DataGrid，这似乎很简单。

谢谢你，埃里克

PS 在 StackOverflow 上回答了几个非常相似的问题，但每个问题似乎都在解决不同 的问题如何在代码中访问 DataGridCell 的数据对象？- 正在寻找删除后的信息，我正在寻找基于行和列的单元格，而不是任何类型的事件 访问 WPF 中 DataGrid 的单元格值？- 是单元格值的一个很好的循环，但我似乎没有看到如何使用该过程来更改单元格属性（例如，如果单元格内容是“史密斯”，则将字体更改为粗体）

这就是我所做的...

// finds and returns a List<DependencyObject> containing datagrid row and cell based on sent datagrid, column, and row parameters
private List<DependencyObject> Get_DataGridCell_By_Index(DataGrid dataGrid, int row, int column)
{
    bool isFound = false;
    DataGridCell returnRow = new DataGridCell();
    DependencyObject returnCell = new DependencyObject();
    DependencyObject dependencyObject = dataGrid as DependencyObject;
    List<DependencyObject> returnList = new List<DependencyObject>();

    // to delete
    int dependencyObjectChildrenCount;
    // to delete

    for (int i = 0; i < VisualTreeHelper.GetChildrenCount(dependencyObject) && !isFound; i++)
    {
        if (VisualTreeHelper.GetChild(dependencyObject, i) is Border)
        {
            dependencyObject = VisualTreeHelper.GetChild(dependencyObject, i);
            isFound = true;
        }
    }

    if (isFound)
    {
        isFound = false;
        for (int i = 0; i < VisualTreeHelper.GetChildrenCount(dependencyObject) && !isFound; i++)
        {
            if (VisualTreeHelper.GetChild(dependencyObject, i) is ScrollViewer)
            {
                dependencyObject = VisualTreeHelper.GetChild(dependencyObject, i);
                isFound = true;
            }
        }
    }

    if (isFound)
    {
        isFound = false;
        for (int i = 0; i < VisualTreeHelper.GetChildrenCount(dependencyObject) && !isFound; i++)
        {
            if (VisualTreeHelper.GetChild(dependencyObject, i) is Grid)
            {
                dependencyObject = VisualTreeHelper.GetChild(dependencyObject, i);
                isFound = true;
            }
        }
    }

    if (isFound)
    {
        isFound = false;
        for (int i = 0; i < VisualTreeHelper.GetChildrenCount(dependencyObject) && !isFound; i++)
        {
            if (VisualTreeHelper.GetChild(dependencyObject, i) is ScrollContentPresenter)
            {
                dependencyObject = VisualTreeHelper.GetChild(dependencyObject, i);
                isFound = true;
            }
        }
    }

    if (isFound)
    {
        isFound = false;
        for (int i = 0; i < VisualTreeHelper.GetChildrenCount(dependencyObject) && !isFound; i++)
        {
            if (VisualTreeHelper.GetChild(dependencyObject, i) is ItemsPresenter)
            {
                dependencyObject = VisualTreeHelper.GetChild(dependencyObject, i);
                isFound = true;
            }
        }
    }

    // to delete
    dependencyObjectChildrenCount = VisualTreeHelper.GetChildrenCount(dependencyObject);
    // to delete

    if (isFound)
    {
        isFound = false;
        for (int i = 0; i < VisualTreeHelper.GetChildrenCount(dependencyObject) && !isFound; i++)
        {
            if (VisualTreeHelper.GetChild(dependencyObject, i) is DataGridRowsPresenter)
            {
                dependencyObject = VisualTreeHelper.GetChild(dependencyObject, i);
                isFound = true;
            }
        }
    }

    // to delete
    dependencyObjectChildrenCount = VisualTreeHelper.GetChildrenCount(dependencyObject);
    // to delete

    // to delete
    // These are variation that I tried to determine what was causing/allowing the children count to go from 0 to the correct number
    //MessageBox.Show("isFound: " + isFound + "\n" + dependencyObject.ToString() + "\nrow: " + row + "\nRowPresenterCount: " + VisualTreeHelper.GetChildrenCount(dependencyObject));
    MessageBox.Show("");
    //dependencyObject.ToString();
    //VisualTreeHelper.GetChildrenCount(dependencyObject);
    // to delete

    // to delete
    dependencyObjectChildrenCount = VisualTreeHelper.GetChildrenCount(dependencyObject);
    // to delete

    if (isFound)
    {
        isFound = false;
        if (VisualTreeHelper.GetChildrenCount(dependencyObject) > row)
        {
            dependencyObject = VisualTreeHelper.GetChild(dependencyObject, row);
            if (dependencyObject is DataGridRow)
            {
                returnList.Add(dependencyObject);
                isFound = true;
            }
        }
    }

    // to delete
    dependencyObjectChildrenCount = VisualTreeHelper.GetChildrenCount(dependencyObject);
    // to delete

    if (isFound)
    {
        isFound = false;
        for (int i = 0; i < VisualTreeHelper.GetChildrenCount(dependencyObject) && !isFound; i++)
        {
            if (VisualTreeHelper.GetChild(dependencyObject, i) is Border)
            {
                dependencyObject = VisualTreeHelper.GetChild(dependencyObject, i);
                isFound = true;
            }
        }
    }

    if (isFound)
    {
        isFound = false;
        for (int i = 0; i < VisualTreeHelper.GetChildrenCount(dependencyObject) && !isFound; i++)
        {
            if (VisualTreeHelper.GetChild(dependencyObject, i) is SelectiveScrollingGrid)
            {
                dependencyObject = VisualTreeHelper.GetChild(dependencyObject, i);
                isFound = true;
            }
        }
    }

    if (isFound)
    {
        isFound = false;
        for (int i = 0; i < VisualTreeHelper.GetChildrenCount(dependencyObject) && !isFound; i++)
        {
            if (VisualTreeHelper.GetChild(dependencyObject, i) is DataGridCellsPresenter)
            {
                dependencyObject = VisualTreeHelper.GetChild(dependencyObject, i);
                isFound = true;
            }
        }
    }

    if (isFound)
    {
        isFound = false;
        for (int i = 0; i < VisualTreeHelper.GetChildrenCount(dependencyObject) && !isFound; i++)
        {
            if (VisualTreeHelper.GetChild(dependencyObject, i) is ItemsPresenter)
            {
                dependencyObject = VisualTreeHelper.GetChild(dependencyObject, i);
                isFound = true;
            }
        }
    }

    if (isFound)
    {
        isFound = false;
        for (int i = 0; i < VisualTreeHelper.GetChildrenCount(dependencyObject) && !isFound; i++)
        {
            if (VisualTreeHelper.GetChild(dependencyObject, i) is DataGridCellsPanel)
            {
                dependencyObject = VisualTreeHelper.GetChild(dependencyObject, i);
                isFound = true;
            }
        }
    }

    if (isFound)
    {
        isFound = false;
        for (int i = 0; i < VisualTreeHelper.GetChildrenCount(dependencyObject) && !isFound; i++)
        {
            if (VisualTreeHelper.GetChild(dependencyObject, i) is DataGridCell)
            {
                dependencyObject = VisualTreeHelper.GetChild(dependencyObject, i);
                isFound = true;
            }
        }
    }

    if (isFound)
    {
        dependencyObject = Get_DataGrid_Sibling_Cell((DataGridCell)dependencyObject, column) as DependencyObject;
        if (dependencyObject != null)
        {
            returnList.Add(dependencyObject);
        }
    }

    return returnList;

} // end Get_DataGridCell_By_Index()

我也试过这个来获取行，但我得到了一个空结果

DataGridRow row = vasgCategoryDataGrid.ItemContainerGenerator.ContainerFromIndex(rowIndex) as DataGridRow;
4

2 回答 2

0

你可以尝试这样的事情（除非你不使用DataGridView）：我希望，这有帮助。

class Bar
{
    public static void Main(string[] args)
    {
        TestWindow Window = new TestWindow(800, 600);
        Window.ShowDialog();
    }
}

class TestWindow : Form
{
    public TestWindow(int Width, int Height)
    {
        Size = new Size(Width, Height);
        BackColor = Color.Black;
        ShowIcon = false;

        MaximizeBox = false;
        MinimizeBox = false;

        FormBorderStyle = FormBorderStyle.FixedSingle;

        MyDataGrid = new DataGrid();
        MyDataGrid.Size = new Size(400, 200);
        MyDataGrid.DataSource = new List<DummyData> { new DummyData("AB", "AD", "AI"), new DummyData("XB", "XS", "XI"), new DummyData("UUU", "FFF", "DDD"), new DummyData("XXXX", "UUUU", "IIII") };

        Button ShowCellButton = new Button();
        ShowCellButton.Click += new EventHandler(MyButton_Click);
        ShowCellButton.Location = new Point(700, 100);
        ShowCellButton.Text = "Show Text";
        ShowCellButton.ForeColor = Color.White;
        ShowCellButton.FlatStyle = FlatStyle.Flat;

        Controls.Add(MyDataGrid);
        Controls.Add(ShowCellButton);
    }

    DataGrid MyDataGrid;

    public void MyButton_Click(object sender, EventArgs e)
    {
        string Text = GetCellText(ref MyDataGrid, 2, 3); // Get Text in Column 2 and Row 3
        MessageBox.Show(Text.ToString());
    }

    public struct DummyData
    {
        public DummyData(string _Key, string _Value, string _Pair)
        {
            Key = _Key;
            Value = _Value;
            Pair = _Pair;
        }

        public string this[int Index]
        {
            get
            {
                if (Index == 0)
                    return Key;
                if (Index == 1)
                    return Value;
                if (Index == 2)
                    return Pair;
                return "";
            }
            set
            {
                if (Index == 0)
                    Key = value;
                if (Index == 1)
                    Value = value;
                if (Index == 2)
                    Pair = value;

            }
        }

        public string Key { get; set; }
        public string Value { get; set; }
        public string Pair { get; set; }
    }

    private string GetCellText(ref DataGrid MyDataGrid, int Column, int Row)
    {
        List<DummyData> MyData = (List<DummyData>)MyDataGrid.DataSource;

        string ReturnValue = "";

        for (int i = 0; i < MyData.ToArray().Length; i++)
        {
            DummyData Temp = MyData[Row - 1];
            return (Temp[Column - 1]);
        }

        return (ReturnValue);
    }
}
于 2016-05-20T05:19:18.837 回答
0

我能够在以下位置找到解决方案： https ://social.msdn.microsoft.com/Forums/vstudio/en-US/0d7df388-da85-4c29-a425-925d13b17604/how-to-change-wpf-datagrid-cell -background-color-programmatically-using-c?forum=wpf

using System.Windows;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using System.Windows.Media;

namespace SelectDataGridCell
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            this.InitializeComponent();
        }

        private void Button_Click(object sender, System.Windows.RoutedEventArgs e)
        {
            DataGridCell cell = GetCell(1, 1, myDataGrid);
                    cell.Background = new SolidColorBrush(Colors.Red);
        }

        public DataGridCell GetCell(int rowIndex, int columnIndex, DataGrid dg)
        {
            DataGridRow row = dg.ItemContainerGenerator.ContainerFromIndex(rowIndex) as DataGridRow;
            DataGridCellsPresenter p = GetVisualChild<DataGridCellsPresenter>(row);
            DataGridCell cell = p.ItemContainerGenerator.ContainerFromIndex(columnIndex) as DataGridCell;
            return cell;
        }

        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;
        } 
    }
}
于 2016-05-22T02:39:33.273 回答