Question

在下面的示例中，我创建了一个对象集合并将它们绑定到DataGridView。单击该按钮时，我.SuspendBinding，然后删除所有记录，然后.ResumeBinding。当我删除网格的选定行的{m_dataSource.RemoveAt（pos）}时，会触发DataGridView1_SelectionChanged事件。为什么是这样？我认为.SuspendBinding（）会阻止任何事件触发到网格。如果没有，那么.SuspendBinding（）是什么意思？

感谢名单。

Imports System.ComponentModel

Public Class Form1

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

结束班

Answer 1

SuspendBinding()不会停止在datagridview上触发事件。它会停止数据绑定 - 即在挂起绑定时，datagridview中的更改不会更新原始数据源。

由于SelectionChanged事件完全独立于数据绑定（即使没有数据绑定源也会触发），即使数据绑定已被暂停，它也会继续触发。

你是否特意想停止SelectionChanged事件发生？在这种情况下，您可以暂时取消绑定处理程序，例如

RemoveHandler DataGridView1.SelectionChanged, AddressOf DataGridView1_SelectionChanged

次要修改

对我的原始答案稍作修正：自从您在SuspendBinding()上调用BindingSource后，对BindingSource的更改不会传播到其数据源更为正确。< / p>

BindingSource.SuspendBindings（）打开时触发DataGridView.SelectionChanged事件

1 个答案: