| > 可以对字母字符和数字进行排序。但是，使用 String.Compare 不能对特定数据类型进行正确排序，例如日期和时间信息。因此，System.DateTime 结构具有一个与 String 类相同作用的 Compare 方法。这个方法可以用来基于时间顺序执行相同类型的排序。在本部分中，您只需修改 Compare 方法就可以正确排序日期。
添加以下代码以替换为 Compare 方法（该方法是前面示例中定义的 ListViewItemComparer 类的方法）而定义的代码。
''''Visual Basic
Public Function Compare(ByVal x As Object, ByVal y As Object) As
Integer Implements System.Collections.IComparer.Compare
Dim returnVal As Integer
'''' Determine whether the type being compared is a date type.
Try
'''' Parse the two objects passed as a parameter as a DateTime.
Dim firstDate As System.DateTime = DateTime.Parse(CType(x, _
ListViewItem).SubItems(col).Text)
Dim secondDate As System.DateTime = DateTime.Parse(CType(y, _
ListViewItem).SubItems(col).Text)
'''' Compare the two dates.
returnVal = DateTime.Compare(firstDate, secondDate)
'''' If neither compared object has a valid date format,
'''' compare as a string.
Catch
'''' Compare the two items as a string.
returnVal = [String].Compare(CType(x, _
ListViewItem).SubItems(col).Text, CType(y,ListViewItem).SubItems(col).Text)
End Try
'''' Determine whether the sort order is descending.
If order = SortOrder.Descending Then
'''' Invert the value returned by String.Compare.
returnVal *= -1
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