using System;

using System.Collections.Generic;

using System.Text;

using System.IO;

​

public class Program

{

    private static string arbitrarySentence = @"This is

an arbitrary

sentence";

​

    public static void Main(string[] args)

    {

        StringBuilderExample(arbitrarySentence);

        StringReaderAndStringWriterExample(arbitrarySentence);

    }

​

    // This method shows how a StringBuilder can be used

    private static void StringBuilderExample(string arg)

    {

        var stringList = ReadAndConnectLines(arg);

        var stringBuilder = new StringBuilder();

        stringBuilder.AppendMultiple(stringList.ToArray());

        Console.WriteLine(stringBuilder);

    }

​

    /* The StringReader and StringWriter classes

     * derive from TextReader and TextWriter

     * and implicitly use StringBuilder.

     * For just editing strings, the StringBuilder

     * does its job great

     */

    private static void StringReaderAndStringWriterExample(string arg)

    {

        var stringList = ReadAndConnectLines(arg);

        var stringWriter = new StringWriter();

​

        // you could pass every single in one method call

        // but for the portability a foreach is used

        foreach (var str in stringList)

        {

            stringWriter.Write(str);

            stringWriter.Write(" ");

        }

        Console.WriteLine(stringWriter);

    }

​

    // StringReader example

    private static List<string> ReadAndConnectLines(string arg)

    {

        var stringReader = new StringReader(arg);

        var stringList = new List<string>();

        string line;

​

        while (null != (line = stringReader.ReadLine()))

        {

            stringList.Add(line);

        }

​

        return stringList;

    }

​

}

​

// Class with Extension methods for the StringBuilder and StringWriter

public static class ExtensionMethods

{

    public static void AppendMultiple(this StringBuilder builder, params string[] args)

    {

        foreach (var str in args)

        {

            builder.Append(str);

            builder.Append(" ");

        }

    }

​

    public static void WriteMultiple() {}

}