通过

SaveChangeContext.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 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
)

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

以下示例检查是否可在项存储区中创建新项。如果无法创建项，则记录一个约束冲突。此示例代码摘自 SaveChangeWithChangeUnits 的实现。

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

SaveChangeContext 类
SaveChangeContext 成员
Microsoft.Synchronization 命名空间