SyncCallbacks.ItemConstraint 事件

对于抵触冲突解决策略设置为 ApplicationDefined 的抵触冲突和所有非抵触约束冲突，在报告约束冲突时发生。

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

语法

声明
Public Event ItemConstraint As EventHandler(Of ItemConstraintEventArgs)
用法
Dim instance As SyncCallbacks
Dim handler As EventHandler(Of ItemConstraintEventArgs)

AddHandler instance.ItemConstraint, handler

public event EventHandler<ItemConstraintEventArgs> ItemConstraint

public:
event EventHandler<ItemConstraintEventArgs^>^ ItemConstraint {
    void add (EventHandler<ItemConstraintEventArgs^>^ value);
    void remove (EventHandler<ItemConstraintEventArgs^>^ value);
}

/** @event */
public void add_ItemConstraint (EventHandler<ItemConstraintEventArgs> value)

/** @event */
public void remove_ItemConstraint (EventHandler<ItemConstraintEventArgs> value)

JScript supports the use of events, but not the declaration of new ones.

备注

应用程序可以使用此通知来执行约束冲突的自定义冲突解决方法。为此，应用程序将检查并处理发送给事件处理程序的 ItemConstraintEventArgs 对象的内容，然后通过调用 SetResolutionAction（在应用程序从此方法返回之前调用），为冲突设置解决操作。

当 ItemConstraintEventArgs 对象的 ConstraintConflictReason 属性设置为 Collision 之外的任何值时，必须将解决操作设置为 SkipChange 或 SaveConflict。

示例

下面的示例实现 ItemConstraint 事件的处理程序。该处理程序向用户显示冲突项，并基于用户的响应设置约束冲突解决操作。

Private Sub HandleItemConstraint(ByVal sender As [Object], ByVal args As ItemConstraintEventArgs)
    If ConstraintConflictReason.Collision = args.ConstraintConflictReason Then
        ' Display the two items that are in conflict and solicit a resolution from the user.
        Dim srcContact As New Contact(DirectCast(args.SourceChangeData, String()))
        Dim destContact As New Contact(DirectCast(args.DestinationChangeData, String()))
        Dim msg As String = ("Source change is " & srcContact.ToString() & vbLf & "Destination change is ") & destContact.ToString() & vbLf & "Click Yes to rename the source change and apply it." & vbLf & "Click No to rename the destination item and apply the source change." & vbLf & "Click Cancel to delete the destination item and apply the source change."
        Dim ccDlg As New ConstraintConflictDlg(msg)
        ccDlg.ShowDialog()

        ' Set the resolution action based on the user's response.
        args.SetResolutionAction(ccDlg.Resolution)
    Else
        args.SetResolutionAction(ConstraintConflictResolutionAction.SaveConflict)
    End If
End Sub

void HandleItemConstraint(Object sender, ItemConstraintEventArgs args)
{
    if (ConstraintConflictReason.Collision == args.ConstraintConflictReason)
    {
        // Display the two items that are in conflict and solicit a resolution from the user.
        Contact srcContact = new Contact((string[])args.SourceChangeData);
        Contact destContact = new Contact((string[])args.DestinationChangeData);
        string msg = "Source change is " + srcContact.ToString() +
                   "\nDestination change is " + destContact.ToString() +
                   "\nClick Yes to rename the source change and apply it." +
                   "\nClick No to rename the destination item and apply the source change." +
                   "\nClick Cancel to delete the destination item and apply the source change.";
        ConstraintConflictDlg ccDlg = new ConstraintConflictDlg(msg);
        ccDlg.ShowDialog();

        // Set the resolution action based on the user's response.
        args.SetResolutionAction(ccDlg.Resolution);
    }
    else 
    {
        args.SetResolutionAction(ConstraintConflictResolutionAction.SaveConflict);
    }
}

请参阅

参考

SyncCallbacks 类
SyncCallbacks 成员
Microsoft.Synchronization 命名空间

概念

检测和解决约束冲突