SeekOrigin Enumeración
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 | 0 | Especifica el comienzo de una secuencia.Specifies the beginning of a stream. |
Current | 1 | Especifica lo posición actual dentro de la secuencia.Specifies the current position within a stream. |
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.