Question

我得到了这个代码，它从datagridview1中选择不同的值并将结果传递给datagridview2：

进一步详情：来自datagridview1的数据

Code   Amount
Pro1   100.00
Pro2   300.00
Pro1   100.00
Pro1   100.00
Pro2   300.00

结果应该放在datagridview2中，如下所示;

Code   Amount   Count
Pro1   100.00     3
Pro2   300.00     2

CODE：

Dim dic As New Dictionary(Of String, Integer)()
        Dim cellValue As String = Nothing
        For i As Integer = 0 To dgvSubjectsEnrolled.Rows.Count - 1
            If Not dgvSubjectsEnrolled.Rows(i).IsNewRow Then
                If dgvSubjectsEnrolled(0, i).Value > 0 Then
                    cellValue = dgvSubjectsEnrolled(0, i).Value.ToString()
                    If Not dic.ContainsKey(cellValue) Then
                        dic.Add(cellValue, 1)
                    Else
                        dic(cellValue) += 1
                    End If
                Else
                End If

            End If
        Next

        Dim sb1 As New StringBuilder()
        Dim sb2 As New StringBuilder()
        For Each keyvalue As KeyValuePair(Of String, Integer) In dic
            sb1.AppendLine(String.Format("{0}", keyvalue.Key, keyvalue.Value))
            sb2.AppendLine(String.Format("{1}", keyvalue.Key, keyvalue.Value))
        Next
        Me.dgvsub.Rows.Add(sb1.ToString, sb2.ToString())

代码执行成功但结果是：

  Code         Count
Pro1Pro2        32

数据与同一行连接在一起。下一个值应该在下一行。请编辑此代码。

Answer 1

一种方法，使用字典而不是列表：

Private Sub copyDGVs()
    Dim values As Dictionary(Of String, Integer) = New Dictionary(Of String, Integer)()
    Dim i As Integer = 1
    Dim tmp As String
    Dim arr As String()

    'Make a list of distinct values from DataGridView1, track the count.
    For Each row As DataGridViewRow In dgv1.Rows
        tmp = ""
        For j As Integer = 0 To row.Cells.Count - 1
            tmp &= row.Cells(j).Value & "-"
        Next
        If (Not values.ContainsKey(tmp)) Then
            values.Add(tmp, 1)
        Else
            values(tmp) += 1
        End If
    Next

    'Copy that list into DataGridView2
    For Each guy As KeyValuePair(Of String, Integer) In values
        arr = guy.Key.Split("-")
        For q As Integer = 0 To arr.Length - 1
            dgv2.Rows(i).Cells(q + 1).Value = arr(q)
            If (q = arr.Length - 1) Then
                dgv2.Rows(i).Cells(q + 2).Value = guy.Value
            End If
        Next
        i += 1
    Next
End Sub

这不是我写过的美貌，但它应该做你需要的东西，除非我对索引进行了嘲笑。

PER COMMENTS / EDIT：

我认为现在的问题是你要附加到你的stringbuilders，从不重置它们，也不要写入循环内部。尝试这样的事情，看看它是否更好：

Dim sb1 As StringBuilder()
Dim sb2 As StringBuilder()
For Each keyvalue As KeyValuePair(Of String, Integer) In dic
    sb1 = New StringBuilder()
    sb2 = New StringBuilder()
    sb1.AppendLine(String.Format("{0}", keyvalue.Key, keyvalue.Value))
    sb2.AppendLine(String.Format("{1}", keyvalue.Key, keyvalue.Value))
    Me.dgvsub.Rows.Add(sb1.ToString, sb2.ToString())
Next

从datagridview1获取不同的行并传递到datagridview2

1 个答案: