Question

由于DataSource中的更改，是否存在DataGridView中单元格值发生更改的事件？

我创建了自己的实现INotifyPropertyChanged的自定义类，

public class CustomWorkbook : INotifyPropertyChanged
{
    string filepath;
    string status;
    public event PropertyChangedEventHandler PropertyChanged;

    private void NotifyPropertyChanged([CallerMemberName] String propertyName = "")
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }
    }

    ...
}

并将其绑定到我的DataGridView，如下所示，

BindingList<CustomWorkbook> workbookList = new BindingList<CustomWorkbook>();
BindingSource workbookBinding = new BindingSource(workbookList , null);
dataGridViewWorkbooks.DataSource = workbookBinding;

目前，单元格值会根据需要自动更新，但是我想添加更多处理和美学效果，需要知道单元格值何时发生变化以及哪个单元格（即使UPDATED单元格为绿色，PENDING单元格）黄色）

我在DataGridView中尝试过CellValueChanged事件，但这似乎只适用于用户编辑。 NotifyPropertyChanged事件将在值发生更改时触发...但它不会提供对已更改的单元格的任何引用。

Answer 1

在采用蛮力方法只为大多数DataGridView事件添加事件处理程序之后，我发现DataBindingComplete事件就是我所追求的。每当我的CustomWorkbook课程中的某个媒体资源发生变化时，我就会提出此事件（我假设INotifyPropertyChanged一直到BindingList，BindingSource，最后DataSource。 DataGridView？）。

虽然此事件未提供对已更改属性的相应单元格的任何引用，但我最终只是循环遍历所有单元格，因为我知道包含相关单元格的列的名称。

    /// <summary>
    /// Called whenever changes have been made to the binded list
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    private void DataGridViews_DataBindingComplete(object sender, DataGridViewBindingCompleteEventArgs e)
    {
        DataGridViews_UpdateStatusColour(sender as DataGridView);
    }

    /// <summary>
    /// Change the colour of the cells in the column whose DataPropertyName is "Status"
    /// </summary>
    /// <param name="grid"></param>
    private void DataGridViews_UpdateStatusColour(DataGridView grid)
    {
        // Get the column index
        int targetColumn = 0;
        foreach (DataGridViewColumn col in grid.Columns)
        {
            if (col.DataPropertyName == "Status")
            {
                targetColumn = col.Index;
                break;
            }
        }

        // Loop through every row, and colour the corresponding cell
        foreach (DataGridViewRow row in grid.Rows)
        {
            DataGridViewCell cell = row.Cells[targetColumn];
            switch (cell.Value.toString())
            {
                case ("UPDATED"):
                    cell.Style.BackColor = System.Drawing.Color.Green;
                    cell.Style.SelectionBackColor = System.Drawing.Color.Green;
                    break;
                case ("PENDING"):
                    cell.Style.BackColor = System.Drawing.Color.Orange;
                    cell.Style.SelectionBackColor = System.Drawing.Color.Orange;
                    break;
                case ("MISSING"):
                    cell.Style.BackColor = System.Drawing.Color.LightSalmon;
                    cell.Style.SelectionBackColor = System.Drawing.Color.LightSalmon;
                    break;
                case ("ERROR"):
                    cell.Style.BackColor = System.Drawing.Color.Red;
                    cell.Style.SelectionBackColor = System.Drawing.Color.Red;
                    break;
                default:
                    break;
            }
        }
    }

它看起来像什么：

C＃DataGridView - 由DataSource引起的Cell更改事件

1 个答案: