FileInfo.OpenRead Método

Definición

Espacio de nombres:
System.IO
Ensamblados:
mscorlib.dll, System.IO.FileSystem.dll
Ensamblados:
netstandard.dll, System.Runtime.dll
Ensamblados:
netstandard.dll, System.IO.FileSystem.dll
Ensamblados:
netstandard.dll, System.IO.FileSystem.dll, System.Runtime.dll
Ensamblado:
System.IO.FileSystem.dll
Ensamblado:
mscorlib.dll
Ensamblado:
netstandard.dll
Source:
FileInfo.cs
Source:
FileInfo.cs
Source:
FileInfo.cs
Source:
FileInfo.cs
Source:
FileInfo.cs

Crea un valor de solo FileStreamlectura.

public:
 System::IO::FileStream ^ OpenRead();
public System.IO.FileStream OpenRead();
member this.OpenRead : unit -> System.IO.FileStream
Public Function OpenRead () As FileStream

Devoluciones

FileStream

Nuevo objeto de solo lectura FileStream .

Excepciones

UnauthorizedAccessException

Name es de solo lectura o es un directorio.

DirectoryNotFoundException

La ruta de acceso especificada no es válida, como estar en una unidad no asignada.

IOException

El archivo ya está abierto.

Ejemplos

En el ejemplo siguiente se abre un archivo como de solo lectura y se lee de él.

using System;
using System.IO;
using System.Text;

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

        // Delete the file if it exists.
        if (!fi.Exists)
        {
            //Create the file.
            using (FileStream fs = fi.Create())
            {
                Byte[] info = new UTF8Encoding(true).GetBytes("This is some text in the file.");
                //Add some information to the file.
                fs.Write(info, 0, info.Length);
            }
        }

        //Open the stream and read it back.
        using (FileStream fs = fi.OpenRead())
        {
            byte[] b = new byte[1024];
            UTF8Encoding temp = new UTF8Encoding(true);

            while (fs.Read(b,0,b.Length) > 0)
            {
                Console.WriteLine(temp.GetString(b));
            }
        }
    }
}
//This code produces output similar to the following;
//results may vary based on the computer/file structure/etc.:
//
//This is some text in the file.
//
//
//
//
//
//
//
//
//
//
//
//

Imports System.IO
Imports System.Text

Public Class Test

    Public Shared Sub Main()
        Dim path As String = "c:\temp\MyTest.txt"
        Dim fi As FileInfo = New FileInfo(path)
        Dim fs As FileStream

        ' Delete the file if it exists.
        If fi.Exists = False Then
            'Create the file.
            fs = fi.Create()
            Dim info As Byte() = New UTF8Encoding(True).GetBytes("This is some text in the file.")
            'Add some information to the file.
            fs.Write(info, 0, info.Length)
            fs.Close()
        End If

        'Open the stream and read it back.
        fs = fi.OpenRead()
        Dim b(1023) As Byte
        Dim temp As UTF8Encoding = New UTF8Encoding(True)

        Do While fs.Read(b, 0, b.Length) > 0
            Console.WriteLine(temp.GetString(b))
        Loop
        fs.Close()
    End Sub
End Class
'This code produces output similar to the following; 
'results may vary based on the computer/file structure/etc.:
'
'This is some text in the file.
'
'
'
'
'
'
'
'
'
'
'
'
'

Comentarios

Este método devuelve un objeto de solo FileStream lectura con el FileShare modo establecido Readen .

Se aplica a

Consulte también