C# 字符串的处理（大学计算机课题目）
以下这个是大学计算机课上的一个题目：

现有3个string类型的字符串：
string a="A B C";
string b="A D E";
string c="B C F";

如何得出最后的结果：
string d="A B C D E F"?

[解决办法]

C# code

string result = string.Join(" ", Regex.Split(a, @"\s+").Union(Regex.Split(b, @"\s+")).Union(Regex.Split(c, @"\s+")).Distinct());//A B C D E F
[解决办法]
linq完爆
C# code
class Program    {        static void Main(string[] args)        {            var strA = "A B C";            var strB = "A D E";            var strC = "B C F";            var aList = strA.Split(' ').ToList();            var bList = strB.Split(' ').ToList();            var cList = strC.Split(' ').ToList();            aList.AddRange(bList);            aList.AddRange(cList);            var result = aList.Distinct();            foreach (var temp in result)            {                Console.WriteLine(temp);            }            Console.ReadLine();        }    }
[解决办法]
这样更优雅
C# code
 string a = "A B C"; string b = "A D E"; string c = "B C F"; string d = string.Join(" ",(a + b + c).ToCharArray().Distinct().OrderBy(x => x).Select(x => x.ToString()).ToArray()).Trim();
[解决办法]
比较蛋疼的方法
C# code
string d = String.Join(" ", a , b.Trim(a.ToArray()) , c.Trim((a + b).ToCharArray()));
[解决办法]
http://blog.csdn.net/sheshou2/article/details/4766639
[解决办法]
探讨

Regex reg = new Regex(@"(([A-Za-z]).*?)\2\s");

[解决办法]
探讨


正在测试各位的答案，谢谢。

[解决办法]
C# code
private void Form1_Load(object sender, EventArgs e)        {            string a = "A B C";            string b = "A D E";            string c = "B C F";            IList<string> chars = new List<string>();            this.FillList(chars, a);            this.FillList(chars, b);            this.FillList(chars, c);            string result = string.Empty;            foreach (string s in chars)            {                result += s + " ";            }            MessageBox.Show(result);        }        private void FillList(IList<string> list, string s)        {            string[] values = s.Split(' ');            foreach (string c in values)            {                if (!list.Contains(c))                {                    list.Add(c);                }            }        }