DomainContext.RejectChanges 方法

發行項
03/18/2011

還原這個 DomainContext 的所有暫止變更。

命名空間: System.ServiceModel.DomainServices.Client
組件: System.ServiceModel.DomainServices.Client (於 system.servicemodel.domainservices.client.dll)

使用方式

'用途
Dim instance As DomainContext

instance.RejectChanges

語法

'宣告
Public Sub RejectChanges

public void RejectChanges ()

public:
void RejectChanges ()

public void RejectChanges ()

public function RejectChanges ()

範例

下列程式碼範例示範呼叫 SubmitChanges 和 RejectChanges 方法的方法。

Private Sub SaveButton_Click(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs)
    _customerContext.SubmitChanges(AddressOf OnSubmitCompleted, Nothing)
End Sub

Private Sub RejectButton_Click(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs)
    _customerContext.RejectChanges()
    CheckChanges()
End Sub

Private Sub CustomerGrid_RowEditEnded(ByVal sender As System.Object, ByVal e As System.Windows.Controls.DataGridRowEditEndedEventArgs)
    CheckChanges()
End Sub

Private Sub CheckChanges()
    Dim changeSet = _customerContext.EntityContainer.GetChanges()
    ChangeText.Text = changeSet.ToString()

    Dim hasChanges = _customerContext.HasChanges
    SaveButton.IsEnabled = hasChanges
    RejectButton.IsEnabled = hasChanges
End Sub

Private Sub OnSubmitCompleted(ByVal so As SubmitOperation)
    If (so.HasError) Then
        MessageBox.Show(String.Format("Submit Failed: {0}", so.Error.Message))
        so.MarkErrorAsHandled()
    End If
    CheckChanges()
End Sub

private void SaveButton_Click(object sender, RoutedEventArgs e)
{
    _customerContext.SubmitChanges(OnSubmitCompleted, null);
}

private void RejectButton_Click(object sender, RoutedEventArgs e)
{
    _customerContext.RejectChanges();
    CheckChanges();
}

private void CustomerGrid_RowEditEnded(object sender, DataGridRowEditEndedEventArgs e)
{
    CheckChanges();
}

private void CheckChanges()
{
    EntityChangeSet changeSet = _customerContext.EntityContainer.GetChanges();
    ChangeText.Text = changeSet.ToString();

    bool hasChanges = _customerContext.HasChanges;
    SaveButton.IsEnabled = hasChanges;
    RejectButton.IsEnabled = hasChanges;
}

private void OnSubmitCompleted(SubmitOperation so)
{
    if (so.HasError)
    {
        MessageBox.Show(string.Format("Submit Failed: {0}", so.Error.Message));
        so.MarkErrorAsHandled();
    }
    CheckChanges();
}

執行緒安全性

任何這個類型的公用靜態 (在 Visual Basic 中為共用) 成員都具備執行緒安全。不保證任何執行個體成員安全執行緒。

平台

開發平台

Windows XP Home Edition, Windows XP Professional, Windows Server 2003 、Windows Server 2008 和 Windows 2000

目標平台

Change History

另請參閱

參考

DomainContext 類別
 DomainContext 成員
 System.ServiceModel.DomainServices.Client 命名空間

共用方式為