c# stringreader_stringwriter寫入字元及讀取字元(stream流)

static void Main(string[] args)
        {
            //用stringreader讀取字串的值並顯示
            // Create a string to read characters from.
            String str = "Some number of characters";
            // Size the array to hold all the characters of the string
            // so that they are all accessible.
            char[] b = new char[24];
            // Create an instance of StringReader and attach it to the string.
            StringReader sr1 = new StringReader(str);
            sr1.Read(b, 0, str.Length - 1);
            // sr.Read(b, 0, 13);

            // Display the output.
            //console.writeline(char[]);輸出字元陣列的值
            Console.WriteLine(b);
            // Close the StringReader.
            sr1.Close();
            Console.ReadKey();

            

            //用stringwriter（透過stringbuilder)向字串中寫入字元
            StringBuilder sb = new StringBuilder("可變字串　測試　難");
            char[] c ={ ' ','t','c','s','b','.'};
            StringWriter sw = new StringWriter(sb);
            sw.Write(c,0,c.Length-1);
            sw.Close();

            Console.WriteLine(sb);
            Console.ReadKey();
        }