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问题：

在VB Windows Form项目上工作时，有以下代码，该代码应该为带有NextCalibrationDate <= to today's date（在这种情况下只有两行）的行提供红色背景色，但是此效果没有实现。当调试应用程序时，代码似乎可以正常工作，但是两行的颜色并未更改为红色，目前想知道是否是因为在单元格中设置日期方式的问题。

Private Sub GridView1_RowStyle(ByVal sender As Object, ByVal e As DevExpress.XtraGrid.Views.Grid.RowStyleEventArgs) Handles GridView1.RowStyle
Dim nextCalibDate As Date
Dim I As Integer
Dim DataRowCount As Integer = GridView1.DataRowCount
Dim View As GridView = sender
For I = 0 To DataRowCount - 1
If IsDBNull(GridView1.GetRowCellValue(e.RowHandle, colNextCalibrationDt)) Then
'Nothing
Else
nextCalibDate = GridView1.GetRowCellValue(e.RowHandle, colNextCalibrationDt)
If nextCalibDate <= Today.Date Then
If (e.RowHandle >= 0) Then
e.Appearance.BackColor = Color.Red
End If
End If
End If
Next
End Sub

仅供参考，这是用来设置NextCalibrationDate的代码：

Dim DataRowCount As Integer = GridView1.DataRowCount
DataRowCount -= 1
Dim DateCalibrated As Date = GridView1.GetRowCellValue(DataRowCount, colDateCalibrated)
Dim NextCalibrationDt As String
'Set NextCalibrationDt
Select Case CalibInterval
Case "D"
NextCalibrationDt = DateAdd(DateInterval.Day, 1, DateCalibrated)
Case "W"
NextCalibrationDt = DateAdd(DateInterval.Day, 7, DateCalibrated)
Case "M"
NextCalibrationDt = DateAdd(DateInterval.Month, 1, DateCalibrated)
Case "6mos"
NextCalibrationDt = DateAdd(DateInterval.Month, 6, DateCalibrated)
Case "Y"
NextCalibrationDt = DateAdd(DateInterval.Year, 1, DateCalibrated)
Case "B"
NextCalibrationDt = DateAdd(DateInterval.Year, 2, DateCalibrated)
Case "36mos"
NextCalibrationDt = DateAdd(DateInterval.Year, 3, DateCalibrated)
Case "N"
NextCalibrationDt = "NULL"
Case "Calibration Not Required"
NextCalibrationDt = "NULL"
Case Else
NextCalibrationDt = "NULL"
End Select
If NextCalibrationDt <> "NULL" Then
NextCalibrationDt = "'" & NextCalibrationDt & "'"
End If
Dim sqlString As String = "UPDATE [ToolingCalibration].[dbo].[tblToolCalibration] SET LastCalibrationDt = '" & DateCalibrated & "', NextCalibrationDt = " & NextCalibrationDt & " where RecordID = '" & ToolIdToEdit & "'"
Dim toolCmd As New SqlCommand(sqlString, connCalibrationRecord)
toolCmd.Connection.Open()
toolCmd.ExecuteNonQuery()
toolCmd.Connection.Close()

解决办法：

为确保满足条件，请在更改e.Appearance.BackColor属性的行中插入一个断点。在特定情况下，RowStyle事件提供的外观设置的优先级低于其他外观设置。启用e.HighPriority选项确保外观设置的最高优先级。此外，由于每个可见行都会引发RowStyle事件，因此您无需循环执行代码。

在代码结尾处设置e.HighPriority = True也可以解决此问题，并且不依赖循环。

Private Sub GridView1_RowStyle(ByVal sender As Object, ByVal e As DevExpress.XtraGrid.Views.Grid.RowStyleEventArgs) Handles GridView1.RowStyle
Dim nextCalibDate As Date
Dim I As Integer
Dim View As GridView = sender
If IsDBNull(GridView1.GetRowCellValue(e.RowHandle, colNextCalibrationDt)) Then
'Nothing
Else
nextCalibDate = GridView1.GetRowCellValue(e.RowHandle, colNextCalibrationDt)
If nextCalibDate <= Today.Date Then
If (e.RowHandle >= 0) Then
e.Appearance.BackColor = Color.Red
End If
e.HighPriority = True 'override any other formatting
End If
End If
End Sub

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