Question

对不起，我对Visual和学习学习有了新的认识，但我无法根据组合框中的选择更改数据网格视图中显示的数据。任何帮助将不胜感激

Answer 1

以下是LINQ和List(Of Producer)（ _allProducers ）分配给DataGridView的数据源（ grdProducers ）和ComboBox（ cmbProducers ）的示例强>）

Class Producer
    Public Property ID As Integer
    Public Property NAME As String
    Public Property COMPANY_ID As Integer
End Class

Private _allProducers As List(Of Producer) = New List(Of Producer)

填写_allProducers列表：

_allProducers = {
      New Producer() With {.ID = 1, .NAME = "John", .COMPANY_ID = 2},
      New Producer() With {.ID = 2, .NAME = "Sam", .COMPANY_ID = 3},
      New Producer() With {.ID = 3, .NAME = "Smith", .COMPANY_ID = 2},
      New Producer() With {.ID = 4, .NAME = "Dan", .COMPANY_ID = 1}
    }.ToList()

Init ComboBox：

cmbProducers.DropDownStyle = ComboBoxStyle.DropDown
cmbProducers.DataSource = _allProducers
cmbProducers.DisplayMember = "NAME" 'value to display in combo
cmbProducers.ValueMember = "COMPANY_ID" 'value to return

现在，您可以在SelectedIndexChanged ComboBox上设置cmbProducers事件。当SelectedIndex属性发生更改时，会发生此事件。

Private Sub cmbProducers_SelectedIndexChanged(sender As Object, e As EventArgs) Handles cmbProducers.SelectedIndexChanged
    if (IsNumeric(cmbProducers.SelectedValue)) Then 'check for numeric values
      grdProducers.DataSource = _allProducers.Where(Function(p) p.COMPANY_ID = cmbProducers.SelectedValue).ToList()
   EndIf
End Sub

在这种情况下，_allProducers List将被过滤，并返回COMPANY_ID等于在ComboBox中选择的值的所有对象。我希望这可以帮到你。

Windows窗体应用程序根据组合框选择更改数据网格视图中的数据

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