C# Dictionary

                //                 定义     dictionary<string, string> openwith = new dictionary<string, string>();

                //                 添加元素     openwith.add("txt", "notepad.exe");
    openwith.add("bmp", "paint.exe");
    openwith.add("dib", "paint.exe");
    openwith.add("rtf", "wordpad.exe");

                //                 取值     console.writeline("for key = "rtf", value = {0}.", openwith["rtf"]);

                //                 更改值     openwith["rtf"] = "winword.exe";
    console.writeline("for key = "rtf", value = {0}.", openwith["rtf"]);

                //                 遍历key                 foreach (string key in openwith.keys)
    {
        console.writeline("key = {0}", key);
    }

                //                 遍历value                 foreach (string value in openwith.values)
    {
        console.writeline("value = {0}", value);
    }

    //遍历value, second method     dictionary<string, string>.valuecollection valuecoll = openwith.values;
    foreach (string s in valuecoll)
    {
        console.writeline("second method, value = {0}", s);
    }

                //                 遍历字典                 foreach (keyvaluepair<string, string> kvp in openwith)
    {
        console.writeline("key = {0}, value = {1}", kvp.key, kvp.value);
    }

                //                 添加存在的元素                 try                      {
        openwith.add(                 "                 txt                 ", "winword.exe");
    }
    catch (argumentexception)
    {
        console.writeline("an element with key = "txt" already exists.");
    }

                //                 删除元素     openwith.remove("doc");
    if (!openwith.containskey("doc"))
    {
        console.writeline("key "doc" is not found.");
    }

                //                 判断键存在                 if (openwith.containskey("bmp")) // true     {
        console.writeline("an element with key = "bmp" exists.");
    }

                //                 参数为其它类型      dictionary<int, string[]> othertype = new dictionary<int, string[]>();
    othertype.add(1, "1,11,111".split(‘,‘));
    othertype.add(2, "2,22,222".split(‘,‘));
    console.writeline(othertype[1][2]);

                class                                       doucube     {
                         public                 int code { get { return _code; } set { _code = value; } } privateint _code;
        publicstring page { get { return _page; } set { _page = value; } } privatestring _page;
    } 

                //                 声明并添加元素     dictionary<int, doucube> mytype = new dictionary<int, doucube>();
    for (int i = 1; i <= 9; i++)
    {
        doucube element = new doucube();
        element.code = i * 100;
        element.page = "http://www.doucube.com/" + i.tostring() + ".html";
        mytype.add(i, element);
    }

                //                 遍历元素                 foreach (keyvaluepair<int, doucube> kvp in mytype)
    {
        console.writeline("index {0} code:{1} page:{2}", kvp.key, kvp.value.code, kvp.value.page);
    }