如果项目已存在于数据网格视图选定列表中，则添加数量

Question

如果datagridview2中已存在item

，我在datagridview2数量单元格上添加数量时遇到问题

我有两个datagridviews。

1. Datagridview1包含项目列表的价格和数量

2. Datagridview2包含客户选择的数量和价格的商品。

我在datagridview中检查项目的代码是：

If DataGridView2.Rows.Count > 0 Then

    Dim Found As Boolean = False

    For Each rw1 As DataGridViewRow In DataGridView1.SelectedRows

        For Each rw2 As DataGridViewRow In DataGridView2.Rows

            If rw1.Cells("Item").Value = rw2.Cells("Column2").Value Then

                rw2.Cells("Column5").Value = rw2.Cells("Column5").Value + 1
                Found = True

            ElseIf Not Found Then

                For Each dr In Me.DataGridView1.SelectedRows

                    Me.DataGridView2.Rows.Add(rw1.Cells(1).Value, 1, rw1.Cells(3).Value)

                Next
                Exit For
            End If                  
        Next  
    Next
End If

当我第一次选择行时，检查行并添加数量，但是当我第二次选择它时，它不会检查并只添加行到datagridview。

我的申请表格如下：

Image shows that the when I select second time it doesn't check and just add row to datagridview debug result. That shows that rw2.cell contains the value of Row 1. and it is not changing, thats why the condition remain false.

我修复了我的代码：

    Dim sum As Integer = 0
    Dim Found As Boolean = False
    For Each rw1 As DataGridViewRow In DataGridView1.SelectedRows
        For Each rw2 As DataGridViewRow In DataGridView2.Rows

            If rw1.Cells("Item").Value = rw2.Cells("Column2").Value Then

                rw2.Cells("Column5").Value = rw2.Cells("Column5").Value + 1
                Found = True
                'Subtracting Quantity from Datagridview1
                For Each sqt As DataGridViewRow In DataGridView1.SelectedRows
                    sqt.Cells(2).Value = sqt.Cells(2).Value - 1
                Next
                'calculating Amount
                For Each row As DataGridViewRow In DataGridView2.Rows
                    row.Cells("Column6").Value = row.Cells("Column5").Value * row.Cells("Column3").Value
                Next
                ' Calculating Total Amount
                '  Dim sum As Integer = 0
                For i As Integer = 0 To DataGridView2.Rows.Count() - 1 Step +1
                    sum = sum + DataGridView2.Rows(i).Cells("Column6").Value
                Next
                TextBox1.Text = sum.ToString()
                Exit Sub
            End If
        Next
    Next
    For Each dr In Me.DataGridView1.SelectedRows
        Me.DataGridView2.Rows.Add(dr.Cells(1).Value, 1, dr.Cells(3).Value) 
    Next