FileInfo.OpenText Metode

Referensi

Definisi

Ruang nama:: System.IO

Rakitan:: mscorlib.dll, System.IO.FileSystem.dll

Rakitan:: System.IO.FileSystem.dll

Rakitan:: System.Runtime.dll

Rakitan:: mscorlib.dll

Rakitan:: netstandard.dll

Sumber:: FileInfo.cs

Sumber:: FileInfo.cs

Sumber:: FileInfo.cs

Penting

Beberapa informasi terkait produk prarilis yang dapat diubah secara signifikan sebelum dirilis. Microsoft tidak memberikan jaminan, tersirat maupun tersurat, sehubungan dengan informasi yang diberikan di sini.

StreamReader Membuat dengan pengodean UTF8 yang membaca dari file teks yang ada.

public:
 System::IO::StreamReader ^ OpenText();

public System.IO.StreamReader OpenText ();

member this.OpenText : unit -> System.IO.StreamReader

Public Function OpenText () As StreamReader

Mengembalikan

StreamReader

Baru StreamReader dengan pengodean UTF8.

Pengecualian

SecurityException

Pemanggil tidak memiliki izin yang diperlukan.

FileNotFoundException

File tidak ditemukan.

UnauthorizedAccessException

Name bersifat baca-saja atau merupakan direktori.

DirectoryNotFoundException

Jalur yang ditentukan tidak valid, seperti berada di drive yang tidak dipetakan.

Contoh

Contoh berikut membaca teks dari file.

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

public ref class OpenTextTest
{
public:
    static void Main()
    {
        String^ path = "c:\\MyTest.txt";

        FileInfo^ fi = gcnew FileInfo(path);

        // Check for existing file
        if (!fi->Exists)
        {
            // Create the file.
            FileStream^ fs = fi->Create();
            array<Byte>^ info =
                (gcnew UTF8Encoding(true))->GetBytes("This is some text in the file.");

            // Add some information to the file.
            fs->Write(info, 0, info->Length);
            fs->Close();
        }

        // Open the stream and read it back.
        StreamReader^ sr = fi->OpenText();
        String^ s = "";
        while ((s = sr->ReadLine()) != nullptr)
        {
            Console::WriteLine(s);
        }
    }
};

int main()
{
    OpenTextTest::Main();
}
//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.
//

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

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

        FileInfo fi = new FileInfo(path);

        // Check for existing file
        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);
                fs.Close();
            }
        }

        // Open the stream and read it back.
        using (StreamReader sr = fi.OpenText())
        {
            string s = "";
            while ((s = sr.ReadLine()) != null)
            {
                Console.WriteLine(s);
            }
        }
    }
}
//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 OpenTextTest
    Public Shared Sub Main()
        Dim path As String = "c:\MyTest.txt"

        Dim fi As New FileInfo(path)

        ' Check for existing file
        If fi.Exists = false Then
            ' Create the file.
            Dim fs As FileStream = 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.
        Dim sr As StreamReader = fi.OpenText()
        Dim s As String = ""
        While sr.EndOfStream = false
            s = sr.ReadLine()
            Console.WriteLine(s)
        End While
        sr.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.
'

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