构建列表中项目计数的字典

您可以使用C#中的group子句来执行此操作.

List stuff = new List();
...

var groups = from s in stuff group s by s into g select 
    new { Stuff = g.Key, Count = g.Count() };

如果需要,您也可以直接调用扩展方法:

var groups = stuff.GroupBy(s => s).Select(
    s => new { Stuff = s.Key, Count = s.Count() });

从这里开始,它是一个简短的步骤Dictionary:

var dictionary = groups.ToDictionary(g => g.Stuff, g => g.Count);

我会创建一个专门的List,由Dictionary支持,add方法将测试成员资格并增加计数(如果找到).

有点像:

public class CountingList
{
    Dictionary countingList = new Dictionary();

   void Add( string s )
   {
        if( countingList.ContainsKey( s ))
             countingList[ s ] ++;
        else
            countingList.Add( s, 1 );
   }
}