LINQ應用實例-對字串陣列元素逐一做處理

static void Main(string[] args)

{

    StringBuilder sb = new StringBuilder();

    //傳統寫法

    sb.Append("var data = [");

    bool addComma = false;

    foreach (string f in Directory.GetFiles("B:\\100311", "*.gif"))

    {

        string pureFileName = Path.GetFileName(f);

        sb.AppendFormat("{0}\"{1}\"", addComma ? "," : "", pureFileName);

        addComma = true;

    }

    sb.Append("];");

    Debug.WriteLine(sb.ToString());

    //用String.Join

    sb.Length = 0;

    sb.Append("var data = [");

    List<string> l = new List<string>();

    foreach (string f in Directory.GetFiles("B:\\100311", "*.gif"))

        l.Add("\"" + Path.GetFileName(f) + "\"");

    sb.Append(string.Join(",", l.ToArray()));

    sb.Append("];");

    Debug.WriteLine(sb.ToString());

    //使用LINQ概念，程式碼可以簡化成一行

    string r = "var data = [" +

                string.Join(",",

                    Directory.GetFiles("b:\\100311", "*.gif")

                    //利用Select()對陣列做處理，只保留檔名部分，前後加上雙引號

                    .Select(s => "\"" + Path.GetFileName(s) + "\"")

                    //轉回字串陣列

                    .ToArray()) + "];";

    Debug.WriteLine(r);

    Console.Read();

}