如何当一个DataGridView的单元格内容改变时保留在排序

Question

在VB.NET WinForms项目，我创造了VS2013我有这样的代码来检测的DataGridView的编程方式，有色背景：这个问题

Private Sub dgvEmployees_CellValueChanged(sender As Object, e As DataGridViewCellEventArgs) Handles dgvEmployees.CellValueChanged 
    ' Pass the row and cell indexes to the method so we can change the color of the edited row 
    CompareDgvToDataSource("employees", e.RowIndex, e.ColumnIndex) 
End Sub 

Private Sub CompareDgvToDataSource(ByVal dataSetName As String, ByVal rowIndex As Integer, ByVal columnIndex As Integer) 
    ' Takes a dataset and the row and column indexes, checks if the row is different from the DataSet and colors the row appropriately 

    EmployeesBindingSource.EndEdit() 

    Dim dsChanges As DataSet = EmployeesDataSet.GetChanges() 

    If Not dsChanges Is Nothing Then 
     For Each dtrow As DataRow In dsChanges.Tables("employees").Rows 
      If DirectCast(dtrow, EmployeesDataSet.employeesRow).employeeID.ToString = dgvEmployees.Rows(rowIndex).Cells("employeeID").Value.ToString Then 
       For i As Integer = 0 To dsChanges.Tables("employees").Columns.Count - 1 

        If dtrow.RowState.ToString = DataRowState.Added.ToString Then 
         ' TODO: Color entire new row 
        ElseIf dsChanges.Tables(dataSetName).Rows(0).HasVersion(DataRowVersion.Original) Then 
         If Not dtrow(i, DataRowVersion.Current).Equals(dtrow(i, DataRowVersion.Original)) Then 
          Console.WriteLine("Employees ID: " & DirectCast(dtrow, EmployeesDataSet.employeesRow).employeeID) 
          dgvEmployees.Rows(rowIndex).Cells(columnIndex).Style.BackColor = Color.LightPink 
         Else 
          ' TODO: Need to change the BackColor back to what it should be based on its original alternating row color 
         End If 
        End If 
       Next 
      End If 
     Next 
    End If 
End Sub 

是，如果用户将DGV与任何已着色的单元格进行排序，则在排序之后，没有任何单元格被着色。

在排序后，我需要做些什么才能为正确的单元格保留单元格背景颜色？

最终工作守则

Private Sub CompareDgvToDataSource() 

    ' Force ending Edit mode so the last edited value is committed 
    EmployeesBindingSource.EndEdit() 

    Dim dsChanged As DataSet = EmployeesDataSet.GetChanges(DataRowState.Added Or DataRowState.Modified) 

    If Not dsChanged Is Nothing Then 
     Dim dtChanged As DataTable = dsChanged.Tables("employees") 

     For Each row As DataRow In dtChanged.Rows 
      For Each dgvRow As DataGridViewRow In dgvEmployees.Rows 
       If dgvRow.Cells("employeeID").Value IsNot Nothing Then 
        If dgvRow.Cells("employeeID").Value.Equals(row.Item("employeeID")) Then 
         ' Found the row in the DGV that matches the current Changed Row 
         For i As Integer = 0 To dtChanged.Columns.Count - 1 

          If Not row(i, DataRowVersion.Current).Equals(row(i, DataRowVersion.Original)) Then 
           ' Found a Cell in the current DGV row that is different from the DataSet 
           Console.WriteLine("Row index: " & dtChanged.Rows.IndexOf(row)) 
           dgvEmployees.Rows(dgvRow.Index).Cells(i + 1).Style.BackColor = Color.LightPink 
          Else 
           ' Need to change the BackColor back to what it should be based on its original alternating row color 
          End If 
         Next 
        End If 
       End If 

      Next 
     Next 
    End If 
End Sub 

Answer 1

我您的问题+1“因为它是一个有趣的挑战:-)

我不知道，行或单元格的颜色会在排序后会丢失。好奇。这是我会做的。创建一个ViewState变量（或一些其他将保持的对象/变量），它是一个整数数组。当你为某一行着色时，将该行的ID添加到变量中。

然后，在DataGridView.OnSorted事件中，遍历该数组并重新着色每一行。

信息在这里DataGridView.OnSorted事件： http://msdn.microsoft.com/en-us/library/system.windows.forms.datagridview.sorted(v=vs.110).aspx

还是让我知道，如果这是有道理的，或者如果你需要更多的帮助。

编辑：

有可能是一个更好的解决方案：

Windows Forms: DataGridView Problem with backgroundcolor after sorting

ANOTHER编辑：

这家伙找到一个创造性的解决方案通过使用绑定的DataGridView。通过设计，绑定的DGV将在您排序时重新绑定，并且所有样式更改都会丢失。但是，如果您使用未绑定的DGV，则排序后所有样式都会保留。

滚动到最底部看他是如何解决它的。

https://social.msdn.microsoft.com/forums/windows/en-us/f7bde482-cc02-48be-b917-9fdfab73bc18/datagridview-rows-cells-state-not-retaining-after-sorting

更多关于创建未绑定的Windows窗体DataGridView控件：

http://msdn.microsoft.com/en-us/library/5s3ce6k8(v=vs.90).aspx