List資料如下

List<Dictionary<string, string>> items = new List<Dictionary<string, string>>();
 items.Add(new Dictionary<string, string> { { "rank", "1" }, { "username", "UserA" } });
 items.Add(new Dictionary<string, string> { { "rank", "5" }, { "username", "UserB" } });
 items.Add(new Dictionary<string, string> { { "rank", "2" }, { "username", "UserC" } });
 items.Add(new Dictionary<string, string> { { "rank", "4" }, { "username", "UserD" } });

如果要對rank這個key的值做排序怎麼辦?

Google之後找到了簡潔的寫法

由小到大排序

items.Sort(
 (first, second) =>
 { return first["rank"].CompareTo(second["rank"]); }
 );

由大到小

items.Sort(
(first, second) =>
{ return second["rank"].CompareTo(first["rank"]); }
);

在WIN7,VISTA ,WIN8執行都正常,

Google後發現原來XP不支援.NET Framework 4.5

將專案的輸出目標調整至.NET Framework4.0即可在XP上正常運作。