Question

我有DataGridView并且有一个DataGridViewTextBoxColumn，用户可以在其中键入数字，在输入数字后，我会执行搜索以找到该数字下的先前记录。

我想显示这些记录，以便用户可以选择其中一个，或保持值类型，这意味着他想创建一个新记录。

为此，我想在用户输入完成后用这些选项替换DataGridViewTextBoxCell的每个DataGridViewComboBoxCell。

但是，当我尝试使用此替换时，它会引发此异常：＆＃34; System.InvalidOperationException＆＃34;在System.Windows.Forms.dll中。附加信息：该操作无效，因为它导致重新调用函数SetCurrentCellAddressCore。

以下是我的代码（我已尝试处理CellLeave而不是CellValidated）：

Private Sub DataGridViewDebitos_CellValidated(sender As Object, e As DataGridViewCellEventArgs) Handles DataGridViewDebitos.CellValidated
    DataGridViewDebitos.EndEdit(DataGridViewDataErrorContexts.Commit)
    If e.ColumnIndex = ColumnDebito.Index Then
        Dim cellDebito = DataGridViewDebitos.Rows(e.RowIndex).Cells(ColumnDebito.Index)
        Dim numDebito = String.Concat(If(cellDebito.Value, "").ToString.Where(Function(c) Char.IsLetterOrDigit(c)))
        If TypeOf cellDebito Is DataGridViewTextBoxCell AndAlso numDebito.Length >= 3 Then
            Dim prcsa As New List(Of JObject) 'In real version, prcsa is populated by an external function, but it doesn't affect the result
            Dim j = New JObject
            j.SetProperty("id", 0)
            j.SetProperty("nome", cellDebito.Value)
            prcsa.Insert(0, j) 'This option is always present, it allows user to keep simply what was typed
            'Exception hapens here
            DataGridViewDebitos(cellDebito.ColumnIndex, cellDebito.RowIndex) =
                New DataGridViewComboBoxCell With {
                    .DataSource = prcsa,
                    .DisplayMember = "nome",
                    .FlatStyle = FlatStyle.Flat,
                    .ValueMember = "id",
                    .Value = prcsa(0).Value(Of Integer)("id")}
        End If
    End If
End Sub

非常感谢

Answer 1

我通过.BeginInvoke将问题语句放入Lambda子中，这解决了问题，只是我不知道为什么......

有人可以向我解释它的机制吗？谢谢！

Private Sub DataGridViewDebitos_CellValidated(sender As Object, e As DataGridViewCellEventArgs) Handles DataGridViewDebitos.CellValidated
    DataGridViewDebitos.EndEdit(DataGridViewDataErrorContexts.Commit)
    If e.ColumnIndex = ColumnDebito.Index Then
        Dim cellDebito = DataGridViewDebitos.Rows(e.RowIndex).Cells(ColumnDebito.Index)
        Dim numDebito = String.Concat(If(cellDebito.Value, "").ToString.Where(Function(c) Char.IsLetterOrDigit(c)))
        If TypeOf cellDebito Is DataGridViewTextBoxCell AndAlso numDebito.Length >= 3 Then
            Dim prcsa As New List(Of JObject) 'In real version, prcsa is populated by an external function, but it doesn't affect the result
            Dim j = New JObject
            j.SetProperty("id", 0)
            j.SetProperty("nome", cellDebito.Value)
            prcsa.Insert(0, j) 'This option is always present, it allows user to keep simply what was typed
            'Exception hapens here
            DataGridViewDebitos.BeginInvoke(
                Sub()
                    DataGridViewDebitos(cellDebito.ColumnIndex, cellDebito.RowIndex) =
                        New DataGridViewComboBoxCell With {
                        .DataSource = prcsa,
                        .DisplayMember = "nome",
                        .FlatStyle = FlatStyle.Flat,
                        .ValueMember = "id",
                        .Value = prcsa(0)("id")}
                End Sub)
        End If
    End If
End Sub

设置新的DataGridViewComboBoxCell，用于在同一列和行

1 个答案: