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IsolatedStorageFileStream.Handle Vlastnost

Definice

Upozornění

This property has been deprecated. Please use IsolatedStorageFileStream's SafeFileHandle property instead. https://go.microsoft.com/fwlink/?linkid=14202

Upozornění

IsolatedStorageFileStream.Handle has been deprecated. Use IsolatedStorageFileStream's SafeFileHandle property instead.

Upozornění

This property has been deprecated. Please use IsolatedStorageFileStream's SafeFileHandle property instead. http://go.microsoft.com/fwlink/?linkid=14202

Získá popisovač souboru pro soubor, který aktuální IsolatedStorageFileStream objekt zapouzdřuje. Přístup k této vlastnosti není u objektu IsolatedStorageFileStream povolen a vyvolá .IsolatedStorageException

public:
 virtual property IntPtr Handle { IntPtr get(); };
[System.Obsolete("This property has been deprecated.  Please use IsolatedStorageFileStream's SafeFileHandle property instead.  https://go.microsoft.com/fwlink/?linkid=14202")]
public override IntPtr Handle { get; }
[System.Obsolete("IsolatedStorageFileStream.Handle has been deprecated. Use IsolatedStorageFileStream's SafeFileHandle property instead.")]
public override IntPtr Handle { get; }
[System.Obsolete("This property has been deprecated.  Please use IsolatedStorageFileStream's SafeFileHandle property instead.  http://go.microsoft.com/fwlink/?linkid=14202")]
public override IntPtr Handle { get; }
public override IntPtr Handle { get; }
[System.Obsolete("This property has been deprecated.  Please use IsolatedStorageFileStream's SafeFileHandle property instead.  http://go.microsoft.com/fwlink/?linkid=14202")]
public override IntPtr Handle { [System.Security.SecurityCritical] get; }
[<System.Obsolete("This property has been deprecated.  Please use IsolatedStorageFileStream's SafeFileHandle property instead.  https://go.microsoft.com/fwlink/?linkid=14202")>]
member this.Handle : nativeint
[<System.Obsolete("IsolatedStorageFileStream.Handle has been deprecated. Use IsolatedStorageFileStream's SafeFileHandle property instead.")>]
member this.Handle : nativeint
[<System.Obsolete("This property has been deprecated.  Please use IsolatedStorageFileStream's SafeFileHandle property instead.  http://go.microsoft.com/fwlink/?linkid=14202")>]
member this.Handle : nativeint
member this.Handle : nativeint
[<System.Obsolete("This property has been deprecated.  Please use IsolatedStorageFileStream's SafeFileHandle property instead.  http://go.microsoft.com/fwlink/?linkid=14202")>]
[<get: System.Security.SecurityCritical>]
member this.Handle : nativeint
Public Overrides ReadOnly Property Handle As IntPtr

Hodnota vlastnosti

IntPtr

nativeint

Popisovač souboru, který aktuální IsolatedStorageFileStream objekt zapouzdřuje.

Atributy

Výjimky

Vlastnost Handle vždy vygeneruje tuto výjimku.

Příklady

Následující příklad kódu ukazuje Handle vlastnost.

[SecurityPermissionAttribute(SecurityAction::Demand, Flags=SecurityPermissionFlag::UnmanagedCode)]
bool GetPrefsForUser()
{
   try
   {
      
      // Retrieve an IsolatedStorageFile for the current Domain and Assembly.
      IsolatedStorageFile^ isoFile = IsolatedStorageFile::GetStore( static_cast<IsolatedStorageScope>(IsolatedStorageScope::User | IsolatedStorageScope::Assembly | IsolatedStorageScope::Domain), (Type^)nullptr, nullptr );
      IsolatedStorageFileStream^ isoStream = gcnew IsolatedStorageFileStream( this->userName,FileMode::Open,FileAccess::ReadWrite,isoFile );
      
      // farThe code executes to this point only if a file corresponding to the username exists.
      // Though you can perform operations on the stream, you cannot get a handle to the file.
      try
      {
         IntPtr aFileHandle = isoStream->Handle;
         Console::WriteLine( "A pointer to a file handle has been obtained. {0} {1}", aFileHandle, aFileHandle.GetHashCode() );
      }
      catch ( Exception^ e ) 
      {
         
         // Handle the exception.
         Console::WriteLine( "Expected exception" );
         Console::WriteLine( e->ToString() );
      }

      StreamReader^ reader = gcnew StreamReader( isoStream );
      
      // Read the data.
      this->NewsUrl = reader->ReadLine();
      this->SportsUrl = reader->ReadLine();
      reader->Close();
      isoFile->Close();
      isoStream->Close();
      return false;
   }
   catch ( Exception^ e ) 
   {
      
      // Expected exception if a file cannot be found. This indicates that we have a new user.
      String^ errorMessage = e->ToString();
      return true;
   }

}
private bool GetPrefsForUser()
{
    try
    {

        // Retrieve an IsolatedStorageFile for the current Domain and Assembly.
        IsolatedStorageFile isoFile =
            IsolatedStorageFile.GetStore(IsolatedStorageScope.User |
            IsolatedStorageScope.Assembly |
            IsolatedStorageScope.Domain,
            null,
            null);

        IsolatedStorageFileStream isoStream =
            new IsolatedStorageFileStream("substituteUsername",
            System.IO.FileMode.Open,
            System.IO.FileAccess.Read,
             System.IO.FileShare.Read);

        // The code executes to this point only if a file corresponding to the username exists.
        // Though you can perform operations on the stream, you cannot get a handle to the file.

        try
        {

            SafeFileHandle aFileHandle = isoStream.SafeFileHandle;
            Console.WriteLine("A pointer to a file handle has been obtained. "
                + aFileHandle.ToString() + " "
                + aFileHandle.GetHashCode());
        }

        catch (Exception e)
        {
            // Handle the exception.
            Console.WriteLine("Expected exception");
            Console.WriteLine(e);
        }

        StreamReader reader = new StreamReader(isoStream);
        // Read the data.
        this.NewsUrl = reader.ReadLine();
        this.SportsUrl = reader.ReadLine();
        reader.Close();
        isoFile.Close();
        return false;
    }
    catch (System.IO.FileNotFoundException)
    {
        // Expected exception if a file cannot be found. This indicates that we have a new user.
        return true;
    }
}
Private Function GetPrefsForUser() As Boolean
    Try
        ' Retrieve an IsolatedStorageFile for the current Domain and Assembly.
        Dim isoFile As IsolatedStorageFile = _
            IsolatedStorageFile.GetStore(IsolatedStorageScope.User _
            Or IsolatedStorageScope.Assembly _
            Or IsolatedStorageScope.Domain, Nothing, Nothing)

        Dim isoStream As New IsolatedStorageFileStream("substituteUsername", System.IO.FileMode.Open, _
            System.IO.FileAccess.Read, System.IO.FileShare.Read)
        ' farThe code executes to this point only if a file corresponding to the username exists.
        ' Though you can perform operations on the stream, you cannot get a handle to the file.
        Try

            Dim aFileHandle As SafeFileHandle = isoStream.SafeFileHandle
            Console.WriteLine(("A pointer to a file handle has been obtained. " & aFileHandle.ToString() & " " & aFileHandle.GetHashCode()))

        Catch ex As Exception
            ' Handle the exception.
            Console.WriteLine("Expected exception")
            Console.WriteLine(ex.ToString())
        End Try

        Dim reader As New StreamReader(isoStream)
        ' Read the data.
        Me.NewsUrl = reader.ReadLine()
        Me.SportsUrl = reader.ReadLine()
        reader.Close()
        isoFile.Close()
        Return False
    Catch ex As System.IO.FileNotFoundException
        ' Expected exception if a file cannot be found. This indicates that we have a new user.
        Return True
    End Try
End Function 'GetPrefsForUser

Poznámky

Další informace naleznete v tématu Handle.

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