CacheDependency.UtcLastModified 屬性
定義
重要
部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。
取得上次變更相依性的時間。
public:
property DateTime UtcLastModified { DateTime get(); };public DateTime UtcLastModified { get; }member this.UtcLastModified : DateTimePublic ReadOnly Property UtcLastModified As DateTime屬性值
上次變更相依性的時間。
範例
下列程式代碼範例會 AggregateCacheDependency 使用 類別，將具有兩 CacheDependency 個物件相依性的專案加入至 Cache。 提出專案的要求 Cache 時，程式代碼會檢查專案是否在 中 Cache。 如果是， UtcLastModified 屬性會轉換成字串，並顯示在頁面上。 如果不是，則會建立專案及其兩個相依性，並將其新增至 Cache。
' When the page is loaded, use the
' AggregateCacheDependency class to make
' a cached item dependent on two files.
Sub Page_Load(sender As Object, e As EventArgs)
Dim Source As DataView
Source = Cache("XMLDataSet")
If Source Is Nothing
Dim DS As New DataSet
Dim FS As FileStream
Dim Reader As StreamReader
Dim txtDep As CacheDependency
Dim xmlDep As CacheDependency
Dim aggDep As AggregateCacheDependency
FS = New FileStream(Server.MapPath("authors.xml"),FileMode.Open,FileAccess.Read)
Reader = New StreamReader(FS)
DS.ReadXml(Reader)
FS.Close()
Source = new DataView(ds.Tables(0))
' Create two CacheDependency objects, one to a
' text file and the other to an XML file.
' Create a CacheDependency array with these
' two objects as items in the array.
txtDep = New CacheDependency(Server.MapPath("Storage.txt"))
xmlDep = New CacheDependency(Server.MapPath("authors.xml"))
Dim DepArray() As CacheDependency = {txtDep, xmlDep}
' Create an AggregateCacheDependency object and
' use the Add method to add the array to it.
aggDep = New AggregateCacheDependency()
aggDep.Add(DepArray)
' Call the GetUniqueId method to generate
' an ID for each dependency in the array.
msg1.Text = aggDep.GetUniqueId()
' Add the new data set to the cache with
' dependencies on both files in the array.
Cache.Insert("XMLDataSet", Source, aggDep)
If aggDep.HasChanged = True Then
chngMsg.Text = "The dependency changed at: " & DateTime.Now
Else
chngMsg.Text = "The dependency changed last at: " & aggDep.UtcLastModified.ToString()
End If
cacheMsg1.Text = "Dataset created explicitly"
Else
cacheMsg1.Text = "Dataset retrieved from cache"
End If
MyLiteral.Text = Source.Table.TableName
MyDataGrid.DataSource = Source
MyDataGrid.DataBind()
End Sub
備註
此屬性是以國際標準時間 (UTC) (也稱為 Greenwich Mean Time) 來測量。
