開啓BindingSource.SuspendBindings（）時觸發的DataGridView.SelectionChanged事件

Question

在下面的示例中，我創建了一組對象並將它們綁定到一個DataGridView。當按鈕被單擊時，我將.SuspendBinding，然後刪除所有記錄，然後.ResumeBinding。當我刪除{m_dataSource.RemoveAt（pos）} Grid的選定行時，會觸發DataGridView1_SelectionChanged事件。爲什麼是這樣？我會認爲.SuspendBinding（）會阻止任何事件觸發到網格。如果不是，那麼.SuspendBinding（）有什麼意義？

Thanx。

Imports System.ComponentModel 

公共類Form1中

Private m_dataSource As New BindingList(Of BusinessObjects.Person) 


Private Sub DataGridView1_SelectionChanged(sender As System.Object, e As System.EventArgs) Handles DataGridView1.SelectionChanged 

    Label1.Text = String.Format("SelectionChanged {0}", Date.Now.ToShortTimeString) 

End Sub 

Private Sub Form1_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load 
    LoadData() 
End Sub 

Private Sub LoadData() 

    Dim tempPerson As BusinessObjects.Person 

    tempPerson = New BusinessObjects.Person() With {.PersonID = 1, .FirstName = "a", .LastName = "b"} 
    m_dataSource.Add(tempPerson) 

    tempPerson = New BusinessObjects.Person() With {.PersonID = 2, .FirstName = "c", .LastName = "d"} 
    m_dataSource.Add(tempPerson) 

    BindingSource1.DataSource = m_dataSource 

End Sub 

Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click 

    BindingSource1.SuspendBinding() 

    Dim pos As Int32 

    For pos = m_dataSource.Count - 1 To 0 Step -1 
     m_dataSource.RemoveAt(pos) 
    Next 

    BindingSource1.ResumeBinding() 

End Sub 

末級

Answer 1

SuspendBinding()不會停止射擊的事件上的DataGridView。它停止數據綁定 - 即在綁定掛起時，datagridview中的更改不會更新原始數據源。

由於SelectionChanged事件完全獨立於數據綁定（即使沒有數據綁定源也會觸發），因此即使數據綁定已暫停，它也會繼續激活。

您是否特意尋找停止SelectionChanged事件解僱？在這種情況下，你可以臨時解除綁定處理程序，例如

RemoveHandler DataGridView1.SelectionChanged, AddressOf DataGridView1_SelectionChanged 

小修改

小幅回調到我原來的答覆：因爲你在BindingSource稱爲SuspendBinding()，它會更正確地說，更改BindingSource不會傳播到它的數據源。