Question

我正在使用一个列表来跟踪一些自定义Row对象，如下所示：

Public Rows As List(Of Row)()

Row有2个属性，Key（一个字符串）和Cells（一个ArrayList）。

我需要能够根据开发人员定义的Row ArrayList索引对Rows内的每个Cells进行排序。

例如，基于以下Row s

Row1.Cells = ("b", "12")
Row2.Cells = ("a", "23")

Rows.Sort(0)会导致Row2列在Rows列表中。实现这个目标的最佳方式是什么？

由于

Answer 1

如果在Row对象上实现IComparable，则可以定义自定义比较过程，以便能够进行所需的排序。

这是intro article，可以帮助您入门。

Answer 2

它类似于带有Columns的DatRow，因此您可以替代（对IComparable解决方案）使用DataView的排序功能：

考虑动态创建DataTabale，将其列作为单元格。例如：

Dim rows As New List(Of Row)
Dim row = New Row("Row 1")
Dim cell1 As New Row.Cell("b")
Dim cell2 As New Row.Cell("12")
row.Cells.Add(cell1)
row.Cells.Add(cell2)
rows.Add(row)
row = New Row("Row 2")
cell1 = New Row.Cell("a")
cell2 = New Row.Cell("23")
row.Cells.Add(cell1)
row.Cells.Add(cell2)
rows.Add(row)

Dim tbl As New DataTable()
''#are the cell count in every row equal? Otherwise you can calculate the max-count
Dim cellCount As Int32 = 2 ''#for example
For i As Int32 = 0 To cellCount - 1
    Dim newCol As New DataColumn("Column " & i + 1)
    tbl.Columns.Add(newCol)
Next
For rowIndex As Int32 = 0 To rows.Count - 1
    row = rows(rowIndex)
    Dim newRow As DataRow = tbl.NewRow
    For cellIndex As Int32 = 0 To row.Cells.Count - 1
        Dim cell As Row.Cell = row.Cells(cellIndex)
        newRow(cellIndex) = cell.value
    Next
    tbl.Rows.Add(newRow)
Next
Dim view As New DataView(tbl)
view.Sort = "Column 1"
''#you can use the view as datasource or other purposes

基于自定义对象中的ArrayList对List进行排序

2 个答案: