SeekOrigin SeekOrigin SeekOrigin SeekOrigin Enum

Definición

Especifica la posición usada para buscar en una secuencia.Specifies the position in a stream to use for seeking.

public enum class SeekOrigin
[System.Runtime.InteropServices.ComVisible(true)]
[System.Serializable]
public enum SeekOrigin
type SeekOrigin = 
Public Enum SeekOrigin
Herencia
Atributos

Campos

Begin Begin Begin Begin 0

Especifica el comienzo de una secuencia.Specifies the beginning of a stream.

Current Current Current Current 1

Especifica lo posición actual dentro de la secuencia.Specifies the current position within a stream.

End End End End 2

Especifica el final de una secuencia.Specifies the end of a stream.

Ejemplos

En el ejemplo siguiente se muestra cómo leer hacia atrás a partir del final de la secuencia y cómo leer desde un punto especificado de la secuencia.The following example shows how to read backwards starting at the end of the stream, and how to read from a specified point in the stream.

using System;
using System.IO;

public class FSSeek
{
    public static void Main()
    {
        long offset;
        int nextByte;

        // alphabet.txt contains "abcdefghijklmnopqrstuvwxyz"
        using (FileStream fs = new FileStream(@"c:\temp\alphabet.txt", FileMode.Open, FileAccess.Read))
        {
            for (offset = 1; offset <= fs.Length; offset++)
            {
                fs.Seek(-offset, SeekOrigin.End);
                Console.Write(Convert.ToChar(fs.ReadByte()));
            }
            Console.WriteLine();

            fs.Seek(20, SeekOrigin.Begin);

            while ((nextByte = fs.ReadByte()) > 0)
            {
                Console.Write(Convert.ToChar(nextByte));
            }
            Console.WriteLine();
        }
    }
}
// This code example displays the following output:
//
// zyxwvutsrqponmlkjihgfedcba
// uvwxyz
Imports System.IO

Public Class FSSeek
    Public Shared Sub Main()
        Dim offset As Long
        Dim nextByte As Integer

        ' alphabet.txt contains "abcdefghijklmnopqrstuvwxyz"
        Using fs As New FileStream("c:\temp\alphabet.txt", FileMode.Open, FileAccess.Read)

            For offset = 1 To fs.Length
                fs.Seek(-offset, SeekOrigin.End)
                Console.Write(Convert.ToChar(fs.ReadByte()))
            Next offset
            Console.WriteLine()

            fs.Seek(20, SeekOrigin.Begin)

            nextByte = fs.ReadByte()
            While (nextByte > 0)
                Console.Write(Convert.ToChar(nextByte))
                nextByte = fs.ReadByte()
            End While
            Console.WriteLine()

        End Using
    End Sub
End Class

' This code example displays the following output:
'
' zyxwvutsrqponmlkjihgfedcba
' uvwxyz

Comentarios

SeekOriginlo Seek usan los métodos de Stream, BufferedStream, FileStream, MemoryStream, yotrasclases.BinaryWriterSeekOrigin is used by the Seek methods of Stream, BufferedStream, FileStream, MemoryStream, BinaryWriter, and other classes. Los Seek métodos toman un parámetro de desplazamiento que es relativo a la posición especificada SeekOriginpor.The Seek methods take an offset parameter that is relative to the position specified by SeekOrigin.

Se aplica a

Consulte también: