SaveChangeContext.RecordConstraintConflictForItem Method (SyncId, ConstraintConflictReason)

Reports that a constraint conflict occurred when the destination provider tried to apply the change to the destination replica, and specifies the item ID of the destination item that is in conflict.

Namespace: Microsoft.Synchronization
Assembly: Microsoft.Synchronization (in microsoft.synchronization.dll)

Syntax

'Declaration
Public Sub RecordConstraintConflictForItem ( _
    conflictingItemId As SyncId, _
    reason As ConstraintConflictReason _
)
'Usage
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
)

Parameters

• conflictingItemId
  The item ID of the destination item that conflicts with the change to be applied.

• reason
  The reason the conflict occurred.

Exceptions

Exception type	Condition
ArgumentNullException	conflictingItemId is a null reference (Nothing in Visual Basic).
SyncInvalidOperationException	A constraint conflict or recoverable error has already been set on this object.

Example

The following example checks whether a new item can be created in the item store. If the item cannot be created, a constraint conflict is recorded. The example code is taken from an implementation of SaveChangeWithChangeUnits.

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;
}

See Also

Reference

SaveChangeContext Class
SaveChangeContext Members
Microsoft.Synchronization Namespace