VirtualPathProvider.GetCacheDependency(String, IEnumerable, DateTime) Yöntem

Tanım

Ad Alanı:

System.Web.Hosting

Bütünleştirilmiş Kod:

System.Web.dll

Belirtilen sanal yolları temel alan bir önbellek bağımlılığı oluşturur.

public:
 virtual System::Web::Caching::CacheDependency ^ GetCacheDependency(System::String ^ virtualPath, System::Collections::IEnumerable ^ virtualPathDependencies, DateTime utcStart);

public virtual System.Web.Caching.CacheDependency GetCacheDependency (string virtualPath, System.Collections.IEnumerable virtualPathDependencies, DateTime utcStart);

abstract member GetCacheDependency : string * System.Collections.IEnumerable * DateTime -> System.Web.Caching.CacheDependency
override this.GetCacheDependency : string * System.Collections.IEnumerable * DateTime -> System.Web.Caching.CacheDependency

Public Overridable Function GetCacheDependency (virtualPath As String, virtualPathDependencies As IEnumerable, utcStart As DateTime) As CacheDependency

Parametreler

virtualPath

String

Birincil sanal kaynağın yolu.

virtualPathDependencies

IEnumerable

Birincil sanal kaynağın gerektirdiği diğer kaynaklara giden yol dizisi.

utcStart

DateTime

Sanal kaynakların okunduğu UTC saati.

Döndürülenler

CacheDependency

CacheDependency Belirtilen sanal kaynaklar için bir nesne.

Örnekler

Aşağıdaki kod örneği, özel VirtualPathProvider bir sınıf için yöntemini uygularGetCacheDependency. Örneği çalıştırmak için gereken kodun tamamı için sınıfa genel bakış konusunun VirtualPathProvider Örnek bölümüne bakın.

public override CacheDependency GetCacheDependency(
  string virtualPath, 
  System.Collections.IEnumerable virtualPathDependencies, 
  DateTime utcStart)
{
  if (IsPathVirtual(virtualPath))
  {
    System.Collections.Specialized.StringCollection fullPathDependencies = null;

    // Get the full path to all dependencies.
    foreach (string virtualDependency in virtualPathDependencies)
    {
      if (fullPathDependencies == null)
        fullPathDependencies = new System.Collections.Specialized.StringCollection();

      fullPathDependencies.Add(virtualDependency);
    }
    if (fullPathDependencies == null)
      return null;

    // Copy the list of full-path dependencies into an array.
    string[] fullPathDependenciesArray = new string[fullPathDependencies.Count];
    fullPathDependencies.CopyTo(fullPathDependenciesArray, 0);
    // Copy the virtual path into an array.
    string[] virtualPathArray = new string[1];
    virtualPathArray[0] = virtualPath;

    return new CacheDependency(virtualPathArray, fullPathDependenciesArray, utcStart);
  }
  else
        {
            return Previous.GetCacheDependency(virtualPath, virtualPathDependencies, utcStart);
        }
    }

Public Overrides Function GetCacheDependency(ByVal virtualPath As String, ByVal virtualPathDependencies As IEnumerable, ByVal utcStart As Date) As CacheDependency
  If (IsPathVirtual(virtualPath)) Then

    Dim fullPathDependencies As System.Collections.Specialized.StringCollection
    fullPathDependencies = Nothing

    ' Get the full path to all dependencies.
    For Each virtualDependency As String In virtualPathDependencies
      If fullPathDependencies Is Nothing Then
        fullPathDependencies = New System.Collections.Specialized.StringCollection
      End If

      fullPathDependencies.Add(virtualDependency)
    Next

    If fullPathDependencies Is Nothing Then
      Return Nothing
    End If

    Dim fullPathDependenciesArray As String()
    fullPathDependencies.CopyTo(fullPathDependenciesArray, 0)

    Return New CacheDependency(fullPathDependenciesArray, utcStart)
  Else
    Return Previous.GetCacheDependency(virtualPath, virtualPathDependencies, utcStart)
  End If
End Function

Açıklamalar

yönteminin GetCacheDependency varsayılan uygulaması döndürür null. Sanal kaynakları daha sonra kullanmak üzere önbelleğe almak için yöntemini veya GetFileHash yöntemini geçersiz kılmanız GetCacheDependency gerekir.