通过

SaveChangeWithChangeUnitsContext.RecordConstraintConflictForItem 方法 (SyncId, ConstraintConflictReason)

  • 项目

报告在目标提供程序尝试将变更应用于目标副本时出现了约束冲突，并指定发生冲突的目标项的项 ID。

命名空间: Microsoft.Synchronization
程序集: Microsoft.Synchronization（在 microsoft.synchronization.dll 中）

语法

声明
Public Sub RecordConstraintConflictForItem ( _
    conflictingItemId As SyncId, _
    reason As ConstraintConflictReason _
)
用法
Dim instance As SaveChangeWithChangeUnitsContext
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
)

参数

  • conflictingItemId
    与要应用的变更发生冲突的目标项的项 ID。
  • reason
    发生冲突的原因。

异常

异常类型 条件

ArgumentNullException

conflictingItemId 为 null 引用（在 Visual Basic 中为 Nothing）。

SyncInvalidOperationException

已对此对象设置约束冲突或可恢复错误。

示例

以下示例说明如何报告当在目标副本中创建一个新项时导致的约束冲突。

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;
}

请参阅

参考

SaveChangeWithChangeUnitsContext 类
SaveChangeWithChangeUnitsContext 成员
Microsoft.Synchronization 命名空间