Question

this simply writes the text in textbox to the same file each time…I don’t understand why it works perfectly if I input new characters or change characters while deleting characters doesn’t work…

 private void ContentChanged(object sender, TextChangedEventArgs e)
        {
            Console.WriteLine("cur before:" + this.Box.SelectionStart);
            FileStream f = File.Open(path, FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.ReadWrite);
            StreamWriter writer = new StreamWriter(f);
            model.Cursor = this.Box.SelectionStart;
            writer.Write(this.Box.Text);
            writer.Close();
            Console.WriteLine("cur after:" + this.Box.SelectionStart);
            Console.WriteLine("write:" + count++);
            Console.WriteLine("after write:" + this.Box.Text);
            Console.WriteLine("after write:" + model.Content);
        }

Answer 1

You’re not closing f or flushing – it’s entirely possible that the data is being buffered, which is why it never makes it to the file.

Two suggestions:

• Use using statements with disposable resources such as streams and writers
• Use File.CreateText to create a TextWriter in one call – or better yet, use File.WriteAllText to avoid having to worry about opening and closing at all.

So something like this:

private void ContentChanged(object sender, TextChangedEventArgs e)
{
    Console.WriteLine("cur before:" + this.Box.SelectionStart);
    File.WriteAllText(path, this.Box.Text);
    Console.WriteLine("cur after:" + this.Box.SelectionStart);
    Console.WriteLine("write:" + count++);
    Console.WriteLine("after write:" + this.Box.Text);
    Console.WriteLine("after write:" + model.Content);
}