ItemField 类
表示在将变更应用到目标时用来标识项的方法。
命名空间: Microsoft.Synchronization.SimpleProviders
程序集: Microsoft.Synchronization.SimpleProviders（在 microsoft.synchronization.simpleproviders.dll 中）
语法
声明
Public Class ItemField
用法
Dim instance As ItemField
public class ItemField
public ref class ItemField
public class ItemField
public class ItemField
示例
下面的代码示例演示 EnumerateItems 方法的实现，该方法适用于在内存内存储区中存储项的示例应用程序。CreateItemFieldDictionary 方法是一个示例方法，它为存储区中的每个项创建和返回 ItemFieldDictionary 对象。若要在完整应用程序的上下文中查看此代码，请参见"Sync101 using Simple Sync Provider" 应用程序（可从 Sync Framework SDK 和 Code Gallery 获得）。
public override void EnumerateItems(FullEnumerationContext context)
{
List<ItemFieldDictionary> items = new List<ItemFieldDictionary>();
foreach (ulong id in _store.Ids)
{
items.Add(_store.CreateItemFieldDictionary(id));
}
context.ReportItems(items);
}
public ItemFieldDictionary CreateItemFieldDictionary(ulong id)
{
ItemFieldDictionary itemFields = null;
if (_store.ContainsKey(id))
{
itemFields = new ItemFieldDictionary();
itemFields.Add(new ItemField(MyFullEnumerationSimpleSyncProvider.CUSTOM_FIELD_ID, typeof(ulong), id));
itemFields.Add(new ItemField(MyFullEnumerationSimpleSyncProvider.CUSTOM_FIELD_TIMESTAMP, typeof(ulong), _store[id].TimeStamp));
}
else
{
throw new Exception("Item does not exist in store");
}
return itemFields;
}
Public Overrides Sub EnumerateItems(ByVal context As FullEnumerationContext)
Dim items As New List(Of ItemFieldDictionary)()
For Each id As ULong In _store.Ids
items.Add(_store.CreateItemFieldDictionary(id))
Next
context.ReportItems(items)
End Sub
Public Function CreateItemFieldDictionary(ByVal id As ULong) As ItemFieldDictionary
Dim itemFields As ItemFieldDictionary = Nothing
If _store.ContainsKey(id) Then
itemFields = New ItemFieldDictionary()
itemFields.Add(New ItemField(MyFullEnumerationSimpleSyncProvider.CUSTOM_FIELD_ID, GetType(ULong), id))
itemFields.Add(New ItemField(MyFullEnumerationSimpleSyncProvider.CUSTOM_FIELD_TIMESTAMP, GetType(ULong), _store(id).TimeStamp))
Else
Throw New Exception("Item does not exist in store")
End If
Return itemFields
End Function
继承层次结构
System.Object
Microsoft.Synchronization.SimpleProviders.ItemField
线程安全
此类型的所有公共静态（在 Visual Basic 中共享 ）成员都是线程安全的。不保证任何实例成员的线程安全。