Question

我想这样做，以便根据用户在datagridview中选择的行创建新的数据表，但是我不断收到错误Unable to cast object of type 'System.Windows.Forms.DataGridViewRow' to type 'System.Windows.Forms.DataGridView 我不知道这意味着什么，我希望能得到一些帮助。

Private Function getCoordinates()

    Dim dt2 As New DataTable
    'Dim r As DataRow
    Dim n As Integer
    Dim selectedItems As DataGridViewSelectedRowCollection = dgv.SelectedRows
    dt = dgv.DataSource
    dgv.SelectionMode = DataGridViewSelectionMode.FullRowSelect
    dgv.MultiSelect = True


    dt2.Columns.Add("Position")
    Try
        For Each selectedItem As DataGridView In selectedItems
            dt2.Rows.Add(n)
            dt2.Rows(n)("Position") = dt.Rows.Item(n)("Mouse Position")
        Next


    Catch ex As Exception
        MsgBox("Error", MsgBoxStyle.Exclamation, "Error!")
    End Try


    Return dt2

Answer 1

替换

For Each selectedItem As DataGridView In selectedItems
    dt2.Rows.Add(n)
    dt2.Rows(n)("Position") = dt.Rows.Item(n)("Mouse Position")
Next

使用

For Each selectedItem As DataGridViewRow In selectedItems
    dt2.Rows.Add(selectedItem)
    ' dt2.Rows(n)("Position") = dt.Rows.Item(n)("Mouse Position")
Next

Answer 2

selectedItems包含DataGridViewRow对象的列表，而不是DataGridViews。更新到以下内容：

For Each selectedItem As DataGridViewRow In selectedItems

修复未知错误

2 个答案: