Question

I’m attempting to create a 2D array of integers that load in data from a .txt file, however when it compiles this line of code: string line = stream.ReadLine(); it gives me the error in the thread title and also this:

Attempt to access the method failed, System.IO.StreamReader..ctor(System.String)

I understand there may be differences between using txt files between PC and WP7/360 however I am sure that it’s possible because an app my College tutor made used .txt files on his WP7 handset, what sort of changes are there that I must make for Windows Phone to correctly read the file?

For those wanting extra informtion here is the entire method for loading the txt to the int array:

    public void loadMap(string mapFileName)
    {
        int x = 0, y = 0;

        StreamReader stream = new StreamReader(mapFileName);

        do
        {
            string line = stream.ReadLine();
            string[] numbers = line.Split(',');

            foreach (string e in numbers)
            {
                int tile = int.Parse(e);
                this.tileID[x, y] = tile;

                x++;
            }
            y++;
        }
        while (!stream.EndOfStream);
        xSize = x;
        ySize = y;

        stream.Close();

    }

EDIT
Makings some progress now although I’ve hit a new error by using IsolatedStorage methods,
I’ve added this code before the parsing code:

    var store = IsolatedStorageFile.GetUserStoreForApplication();
    var readStream = new IsolatedStorageFileStream(mapFileName, FileMode.Open, store);
    var stream = new StreamReader(readStream);  

And now here: var readStream = new IsolatedStorageFileStream(mapFileName, FileMode.Open, store); I get the error:

Operation not permitted on IsolatedStorageFileStream.

Any Ideas?

Answer 1

For security reasons, applications on Windows Phone are sandboxed, which essentially just means that you’re prevented from touching things that don’t belong to you. Consider using XNA’s StorageContainer class instead, which is designed to work around the security limitations inherent to non-PC platforms.

UPDATE

On further investigation, it looks like Windows Phone doesn’t provide this functionality. Instead, you should use the System.IO.IsolatedStorage class.