AnchorEnumerationContext 類別

傳遞給 AnchorEnumerationSimpleSyncProvider 物件的同步處理工作階段內容。

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

語法

'宣告
Public Class AnchorEnumerationContext
    Inherits ItemEnumerationContext
'用途
Dim instance As AnchorEnumerationContext

public class AnchorEnumerationContext : ItemEnumerationContext

public ref class AnchorEnumerationContext : public ItemEnumerationContext

public class AnchorEnumerationContext extends ItemEnumerationContext

public class AnchorEnumerationContext extends ItemEnumerationContext

備註

提供者可以在一些情況中使用此內容：提供者不會傳回項目的列舉，或者提供者需要修改 Sync Framework 執行階段的列舉行為。

範例

下列程式碼範例示範要傳遞給 EnumerateChanges 方法的 AnchorEnumerationContext 物件，以及在內容物件上呼叫的 ReportChanges 方法。若要在完整應用程式的內容中檢視這段程式碼，請參閱 Sync Framework SDK 及 Code Gallery 中的 "Sync101 using Simple Sync Provider" 應用程式。

public override void EnumerateChanges(byte[] anchor, AnchorEnumerationContext context)
{
    List<LocalItemChange> itemChanges = new List<LocalItemChange>();

    int startIndex = -1;

    if (anchor != null)
    {
        startIndex = _store.Changes.IndexOfKey(BitConverter.ToUInt64(anchor, 0));
    }

    for (int i = startIndex + 1; i < _store.Changes.Count; i++)
    {
        itemChanges.Add(_store.Changes.Values[i]);
    }

    // If the anchor is corrupt or out of date we could revert back to 
    // full enumeration mode for this session, and enumerate all items. 
    // This is done by calling context.ReportItemsAndAutodetectDeletes.
    context.ReportChanges(itemChanges, _store.GetAnchor());
}

Public Overrides Sub EnumerateChanges(ByVal anchor As Byte(), ByVal context As AnchorEnumerationContext)
    Dim itemChanges As New List(Of LocalItemChange)()

    Dim startIndex As Integer = -1

    If anchor IsNot Nothing Then
        startIndex = _store.Changes.IndexOfKey(BitConverter.ToUInt64(anchor, 0))
    End If

    For i As Integer = startIndex + 1 To _store.Changes.Count - 1
        itemChanges.Add(_store.Changes.Values(i))
    Next

    ' If the anchor is corrupt or out of date we could revert back to 
    ' full enumeration mode for this session, and enumerate all items. 
    ' This is done by calling context.ReportItemsAndAutodetectDeletes. 
    context.ReportChanges(itemChanges, _store.GetAnchor())
End Sub

繼承階層

System.Object
   Microsoft.Synchronization.SimpleProviders.ItemEnumerationContext
    Microsoft.Synchronization.SimpleProviders.AnchorEnumerationContext

執行緒安全性

任何公用靜態 (共用 在 Visual Basic) 此型別的成員具備執行緒安全。不保證任何執行個體成員安全執行緒。

請參閱

參考

AnchorEnumerationContext 成員
Microsoft.Synchronization.SimpleProviders 命名空間