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How to: Open and Append to a Log FileĀ 

StreamWriter and StreamReader write characters to and read characters from streams. The following code example opens the log.txt file for input, or creates the file if it does not already exist, and appends information to the end of the file. The contents of the file are then written to standard output for display. As an alternative to this example, the information could be stored as a single string or string array, and the WriteAllText or WriteAllLines method could be used to achieve the same functionality.

NoteNote

Visual Basic users may choose to use the methods and properties provided by the My.Application.Log or My.Computer.FileSystem objects for creating or writing to log files. For more information, see My.Application.Log Object and My.Computer.FileSystem Object.

Example

Option Explicit On 
Option Strict On
Imports System
Imports System.IO
Imports Microsoft.VisualBasic
Class DirAppend
    Public Shared Sub Main()
        Using w As StreamWriter = File.AppendText("log.txt")
            Log("Test1", w)
            Log("Test2", w)
            ' Close the writer and underlying file.
            w.Close()
        End Using
        ' Open and read the file.
        Using r As StreamReader = File.OpenText("log.txt")
            DumpLog(r)
        End Using
    End Sub
    Public Shared Sub Log(ByVal logMessage As String, ByVal w As TextWriter)
        w.Write(ControlChars.CrLf & "Log Entry : ")
        w.WriteLine("{0} {1}", DateTime.Now.ToLongTimeString(), DateTime.Now.ToLongDateString())
        w.WriteLine("  :")
        w.WriteLine("  :{0}", logMessage)
        w.WriteLine("-------------------------------")
        ' Update the underlying file.
        w.Flush()
    End Sub
    Public Shared Sub DumpLog(ByVal r As StreamReader)
        ' While not at the end of the file, read and write lines.
        Dim line As String
        line = r.ReadLine()
        While Not line Is Nothing
            Console.WriteLine(line)
            line = r.ReadLine()
        End While
        r.Close()
    End Sub
End Class
using System;
using System.IO;
class DirAppend
{
    public static void Main(String[] args)
    {
        using (StreamWriter w = File.AppendText("log.txt"))
        {
            Log ("Test1", w);
            Log ("Test2", w);
            // Close the writer and underlying file.
            w.Close();
        }
        // Open and read the file.
        using (StreamReader r = File.OpenText("log.txt"))
        {
            DumpLog (r);
        }
    }
    public static void Log (String logMessage, TextWriter w)
    {
        w.Write("\r\nLog Entry : ");
        w.WriteLine("{0} {1}", DateTime.Now.ToLongTimeString(),
            DateTime.Now.ToLongDateString());
        w.WriteLine("  :");
        w.WriteLine("  :{0}", logMessage);
        w.WriteLine ("-------------------------------");
        // Update the underlying file.
        w.Flush(); 
    }
    public static void DumpLog (StreamReader r)
    {
        // While not at the end of the file, read and write lines.
        String line;
        while ((line=r.ReadLine())!=null)
        {
            Console.WriteLine(line);
        }
        r.Close();
    }
}

See Also

Tasks

How to: Create a Directory Listing
How to: Read and Write to a Newly Created Data File
How to: Read Text from a File
How to: Write Text to a File
How to: Read Characters from a String
How to: Write Characters to a String

Reference

StreamWriter
StreamReader
File.AppendText
File.OpenText
StreamReader.ReadLine

Concepts

Basic File I/O