SaveChangeContext.RecordConstraintConflictForItem 方法 (SyncId, ConstraintConflictReason)

報告當目的地提供者嘗試將變更套用至目的地複寫時發生了衝突，並且指定發生衝突之目的地項目的項目識別碼。

命名空間: Microsoft.Synchronization
組件: Microsoft.Synchronization (在 microsoft.synchronization.dll)

語法

'宣告
Public Sub RecordConstraintConflictForItem ( _
    conflictingItemId As SyncId, _
    reason As ConstraintConflictReason _
)
'用途
Dim instance As SaveChangeContext
Dim conflictingItemId As SyncId
Dim reason As ConstraintConflictReason

instance.RecordConstraintConflictForItem(conflictingItemId, reason)

public void RecordConstraintConflictForItem (
    SyncId conflictingItemId,
    ConstraintConflictReason reason
)

public:
void RecordConstraintConflictForItem (
    SyncId^ conflictingItemId, 
    ConstraintConflictReason reason
)

public void RecordConstraintConflictForItem (
    SyncId conflictingItemId, 
    ConstraintConflictReason reason
)

public function RecordConstraintConflictForItem (
    conflictingItemId : SyncId, 
    reason : ConstraintConflictReason
)

參數

• conflictingItemId
  與要套用之變更發生衝突之目的地項目的項目識別碼。

• reason
  發生衝突的原因。

例外

範例

下列範例會檢查是否可在項目存放區內建立新項目。如果無法建立項目，便會記錄條件約束衝突。此範例程式碼是取自 SaveChangeWithChangeUnits 的實作。

Case SaveChangeAction.Create
    If True Then
        ' Create a new item. Report a constraint conflict if one occurs.
        Try
            Dim constraintReason As ConstraintConflictReason
            Dim conflictingItemId As SyncId = Nothing
            ' Check if the item can be created or if it causes a constraint conflict.
            If _ContactStore.CanCreateContact(change, DirectCast(context.ChangeData, String()), constraintReason, conflictingItemId) Then
                ' No conflict, so create the item.
                _ContactStore.CreateContactFromSync(change, DirectCast(context.ChangeData, String()))
            Else
                ' A constraint conflict occurred, so report this to the change applier.
                context.RecordConstraintConflictForItem(conflictingItemId, constraintReason)
            End If
        Catch ex As Exception
            ' Some other error occurred, so exclude this item for the rest of the session.
            Dim errData As New RecoverableErrorData(ex)
            context.RecordRecoverableErrorForItem(errData)
        End Try
        Exit Select
    End If

case SaveChangeAction.Create:
{
    // Create a new item. Report a constraint conflict if one occurs.
    try
    {
        ConstraintConflictReason constraintReason;
        SyncId conflictingItemId;
        // Check if the item can be created or if it causes a constraint conflict.
        if (_ContactStore.CanCreateContact(change, (string[])context.ChangeData, out constraintReason, out conflictingItemId))
        {
            // No conflict, so create the item.
            _ContactStore.CreateContactFromSync(change, (string[])context.ChangeData);
        }
        else
        {
            // A constraint conflict occurred, so report this to the change applier.
            context.RecordConstraintConflictForItem(conflictingItemId, constraintReason);
        }
    }
    catch (Exception ex)
    {
        // Some other error occurred, so exclude this item for the rest of the session.
        RecoverableErrorData errData = new RecoverableErrorData(ex);
        context.RecordRecoverableErrorForItem(errData);
    }
    break;
}

請參閱

參考

SaveChangeContext 類別
SaveChangeContext 成員
Microsoft.Synchronization 命名空間