FileStream.CanSeek FileStream.CanSeek FileStream.CanSeek FileStream.CanSeek Property

Definition

Ruft einen Wert ab, der angibt, ob der aktuelle Stream Suchvorgänge unterstützt.Gets a value that indicates whether the current stream supports seeking.

public:
 virtual property bool CanSeek { bool get(); };
public override bool CanSeek { get; }
member this.CanSeek : bool
Public Overrides ReadOnly Property CanSeek As Boolean

Eigenschaftswert

true, wenn der Stream Suchvorgänge unterstützt, false, wenn der Stream geschlossen ist oder der FileStream von einem Betriebssystemhandle, z. B. einer Pipe oder einer Ausgabe in der Konsole, erstellt wurde.true if the stream supports seeking; false if the stream is closed or if the FileStream was constructed from an operating-system handle such as a pipe or output to the console.

Beispiele

Im folgenden Beispiel wird die CanSeek Eigenschaft zu überprüfen, ob ein Stream Suchvorgänge unterstützt.The following example uses the CanSeek property to check whether a stream supports seeking.

using namespace System;
using namespace System::IO;
using namespace System::Text;

int main()
{
   String^ path = "c:\\temp\\MyTest.txt";
   
   // Delete the file if it exists.
   if ( File::Exists( path ) )
   {
      File::Delete( path );
   }

   //Create the file.
   FileStream^ fs = File::Create( path );
   try
   {
      if ( fs->CanSeek )
      {
         Console::WriteLine( "The stream connected to {0} is seekable.", path );
      }
      else
      {
         Console::WriteLine( "The stream connected to {0} is not seekable.", path );
      }
   }
   finally
   {
      if ( fs )
         delete (IDisposable^)fs;
   }
}
using System;
using System.IO;
using System.Text;

class Test 
{
	
    public static void Main() 
    {
        string path = @"c:\temp\MyTest.txt";

        // Delete the file if it exists.
        if (File.Exists(path)) 
        {
            File.Delete(path);
        }

        //Create the file.
        using (FileStream fs = File.Create(path)) 
        {
            if (fs.CanSeek) 
            {
                Console.WriteLine("The stream connected to {0} is seekable.", path);
            } 
            else 
            {
                Console.WriteLine("The stream connected to {0} is not seekable.", path);
            }
        }
    }
}
Imports System
Imports System.IO

Public Class Test

    Public Shared Sub Main()
        Dim path As String = "c:\temp\MyTest.txt"

        ' Delete the file if it exists.
        If File.Exists(path) Then
            File.Delete(path)
        End If

        'Create the file.
        Dim fs As FileStream = File.Create(path)

        If fs.CanSeek Then
            Console.WriteLine("The stream connected to {0} is seekable.", path)
        Else
            Console.WriteLine("The stream connected to {0} is not seekable.", path)
        End If

        fs.Close()
    End Sub
End Class

Hinweise

Wenn eine Klasse von abgeleitet Stream unterstützt keine Suchvorgänge, werden Aufrufe von Length, SetLength, Position, und Seek Auslösen einer NotSupportedException.If a class derived from Stream does not support seeking, calls to Length, SetLength, Position, and Seek throw a NotSupportedException.

Wenn der Stream geschlossen ist, gibt diese Eigenschaft false.If the stream is closed, this property returns false.

Gilt für:

Siehe auch