Reading Data

I/O stands for Input / Output. In broader sense, I/O refers to mechanism of communication between two points. One points sends output and another receives the input. Ex: keyboard sends the input to be an displayed output for monitor. In C#, we type input at the prompt and it shows an output at that time.

We'll be using streams to transport our data. Stream is like a flow of our data. We'll create football games to represent this chapter.

Let's create our project on Visual Studio and integrate it with GitHub. Then, do following steps:

1. Right-click at folder in solution explorer > Add > new Item > General > Text Files > named with data.txt
2. Right-click on data.txt > Properties > Copy to ouput directory > copy if newer

Let's get in code.

We are working with directory in our folder, first thing we need is show the current directory.

class Program
{
    static void Main(string[] args)
    {
        string currentDirectory = Directory.GetCurrentDirectory();

        Console.WriteLine(currentDirectory);
    }
}

Now, we want to get the info of our current directory. So, type this code.

DirectoryInfo directory = new DirectoryInfo(currentDirectory);

Then, we want to iterate all files in our current folder.

class Program
{
    static void Main(string[] args)
    {
        string currentDirectory = Directory.GetCurrentDirectory();
        DirectoryInfo directory = new DirectoryInfo(currentDirectory);
        var files = directory.GetFiles();

        foreach (var file in files)
        {
            Console.WriteLine(file.Name);
        }        
    }
}

If we want to be specific, we could type:

var files = directory.GetFiles("*.txt");