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c# file text file access and reading in read mode.

Posted on 2013-02-04
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Last Modified: 2013-02-10
Hi,

I have this line which puts all lines into an array 'lines[]'
lines = File.ReadAllLines(file);

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However this is not ideal as it often throws an error when the file is being accessed by another application.

How can I use the fileaccess.Read option to solve this?

Thankyou
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Question by:mhdi
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3 Comments
 
LVL 75

Assisted Solution

by:käµfm³d 👽
käµfm³d   👽 earned 167 total points
ID: 38853161
If the file is not opened in a mode that allows sharing between readers (and/or writers), then you won't be able to overcome this with code. The only thing you can do is wrap the logic in a try/catch and handle the exception accordingly.
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LVL 10

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Monica P earned 167 total points
ID: 38853828
Try this way
http://msdn.microsoft.com/en-us/library/s2tte0y1.aspx?cs-save-lang=1&cs-lang=csharp#code-snippet-2

Read only mode :http://msdn.microsoft.com/en-us/library/y973b725.aspx

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

        // This text is added only once to the file. 
        if (!File.Exists(path))
        {
            // Create a file to write to. 
            string[] createText = { "Hello", "And", "Welcome" };
            File.WriteAllLines(path, createText);
        }

        // This text is always added, making the file longer over time 
        // if it is not deleted. 
        string appendText = "This is extra text" + Environment.NewLine;
        File.AppendAllText(path, appendText);

        // Open the file to read from. 
        string[] readText = File.ReadAllLines(path);
        foreach (string s in readText)
        {
            Console.WriteLine(s);
        }
    }
}

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LVL 15

Assisted Solution

by:Minh Võ Công
Minh Võ Công earned 166 total points
ID: 38858424
you can use Stream stream = File.Open(seclogPath1, FileMode.Open, FileAccess.Read, FileShare.ReadWrite); to share read file.
//possible seclog paths
        String seclogPath1 = @"\\\\" + target + "\\C$\\Program Files (x86)\\Symantec\\Symantec Endpoint Protection\\seclog.log";
        String seclogPath2 = @"\\\\" + target + "\\C$\\Program Files\\Symantec\\Symantec Endpoint Protection\\seclog.log";

        //if seclog exists
        if (File.Exists(seclogPath1))
        {
            //output.AppendText("file exists at " + seclogPath1);
            //var seclogContent = File.Open(seclogPath1, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);

            Stream stream = File.Open(seclogPath1, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
                //File.OpenRead(seclogPath1);
            StreamReader streamReader = new StreamReader(stream);
            string str = streamReader.ReadToEnd();
            output.AppendText(str);
            streamReader.Close();
            stream.Close();

        }

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Check the topic:
http://stackoverflow.com/questions/12942717/read-log-file-being-used-by-another-process
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