[C#]StringWriter实现的一个功能

如何用一组双倍间距的句子创建一个连续的段落，然后将该段落重新转换为原来的文本：

using system;
using system.io;

class stringrw
{
    static void main()
    {
        string textreadertext = "textreader is the abstract base " +
            "class of streamreader and stringreader, which read " +
            "characters from streams and strings, respectively./n/n" +

            "create an instance of textreader to open a text file " +
            "for reading a specified range of characters, or to " +
            "create a reader based on an existing stream./n/n" +

            "you can also use an instance of textreader to read " +
            "text from a custom backing store using the same " +
            "apis you would use for a string or a stream./n/n";

        console.writeline("original text:/n/n{0}", textreadertext);
        string aline, aparagraph = null;
        stringreader strreader = new stringreader(textreadertext);
        while(true)
        {
            aline = strreader.readline();
            if(aline != null)
            {
                aparagraph = aparagraph + aline + " ";
            }
            else
            {
                aparagraph = aparagraph + "/n";
                break;
            }
        }
        console.writeline("modified text:/n/n{0}", aparagraph);
        int intcharacter;
        char convertedcharacter;
        stringwriter strwriter = new stringwriter();
        strreader = new stringreader(aparagraph);
        while(true)
        {
            intcharacter = strreader.read();
             if(intcharacter == -1) break;
             convertedcharacter = convert.tochar(intcharacter);
            if(convertedcharacter == '.')
            {
                strwriter.write("./n/n");
                strreader.read();
                strreader.read();
            }
            else
            {
                strwriter.write(convertedcharacter);
            }
        }
        console.writeline("/noriginal text:/n/n{0}",
            strwriter.tostring());
    }
}