Question

i got a file that is store in my appliction directory, and he got some site list.
i dont have any problem reading it, but when i want to write to it, i get

System.ArgumentException: Stream is not writeable

this is how i accsess the file:

  FileStream theTextFileStream = new FileStream(Environment.CurrentDirectory + "/fourmlinks.txt",FileMode.OpenOrCreate);

and this is the function that throw me the expection:

public static void WriteNewTextToFile(string text, FileStream theFile)
    {
        string fileText = GetAllTextFromFile(theFile);
        ArrayList fileLIst = populateListFromText(fileText);

        using (StreamWriter fileWriter = new StreamWriter(theFile))
        {
            fileWriter.Write(String.Empty);
            for (int i = 0; i < fileLIst.Count; i++)
            {
                fileWriter.WriteLine(fileLIst[i].ToString());        
            }
        }
    }

the function read the old and new text and add it to an arry. then i clean the file from every thing, and rewriting it with the old and new data from the arry i made.

i dont know if that will help but here is the file proprites:

Build Action: None
Copy To Out Put Directory: Copy always

why i cant rewrite the file?

this is the function i use to read the file content:

public static string GetAllTextFromFile(FileStream theFile)
    {
        string fileText = "";

        using (theFile)
        {
            using (StreamReader stream = new StreamReader(theFile))
            {
                string currentLine = "";
                while ((currentLine = stream.ReadLine()) != null)
                {
                    fileText += currentLine + "\n";
                }

            }
        }

        return fileText;

    }

Answer 1

You have to use Read/Write file access as third parameter –

FileStream theTextFileStream = new FileStream(Environment.CurrentDirectory + "/fourmlinks.txt",FileMode.OpenOrCreate, FileAccess.ReadWrite
);

Important – Remove using(theFile) statement:

public static string GetAllTextFromFile(FileStream theFile)
{
        string fileText = "";

        using (StreamReader stream = new StreamReader(theFile))
        {
            string currentLine = "";
            while ((currentLine = stream.ReadLine()) != null)
            {
                fileText += currentLine + "\n";
            }

        }


    return fileText;

}

Do not use using construct in your case as it will close the underlying stream as in your case you have to manually open and close stream objects.

This will allow you to write in the file as well.

For more information refer following links –

• FileStream Constructor
• FileAccess Enumeration