FileStream.CanSeek Properti

Definisi

Ruang nama:

System.IO

Rakitan:

System.Runtime.dll

Sumber:

FileStream.cs

Mendapatkan nilai yang menunjukkan apakah aliran saat ini mendukung pencarian.

public:
 virtual property bool CanSeek { bool get(); };

public override bool CanSeek { get; }

member this.CanSeek : bool

Public Overrides ReadOnly Property CanSeek As Boolean

Nilai Properti

Boolean

true jika aliran mendukung pencarian; false jika aliran ditutup atau jika FileStream dibangun dari handel sistem operasi seperti pipa atau output ke konsol.

Contoh

Contoh berikut menggunakan CanSeek properti untuk memeriksa apakah aliran mendukung pencarian.

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);
            }
        }
    }
}

open System.IO

let path = @"c:\temp\MyTest.txt"

// Delete the file if it exists.
if File.Exists path then
    File.Delete path


//Create the file.
do
    use fs = File.Create path

    if fs.CanSeek then
        printfn $"The stream connected to {path} is seekable."
    else
        printfn $"The stream connected to {path} is not seekable."

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

Keterangan

Jika kelas yang berasal dari Stream tidak mendukung pencarian, panggilan ke Length, SetLength, Position, dan Seek melempar NotSupportedException.

Jika aliran ditutup, properti ini akan mengembalikan false.

Lihat juga

• I/O File dan Aliran
• Cara: Membaca Teks dari File
• Cara: Menulis Teks ke File