獲取文字中出現的字數

Question

這可以使用C＃Linq完成嗎？

例如：

吹笛人彼得挑選醃辣椒的包，辣椒是甜蜜和播種者彼得，彼得認爲

結果：

peter 3 
peppers 2 
picked 1 
... 

我可以用嵌套的for循環做，但是認爲使用Linq有一個更簡潔，資源更輕的方式。

Answer 1

可以使用的GroupBy：

string original = "peter piper picked a pack of pickled peppers, the peppers were sweet and sower for peter, peter thought"; 

var words = original.Split(new[] {' ',','}, StringSplitOptions.RemoveEmptyEntries); 
var groups = words.GroupBy(w => w); 

foreach(var item in groups) 
    Console.WriteLine("Word {0}: {1}", item.Key, item.Count()); 

Answer 2

"peter piper picked a pack of pickled peppers,the peppers 
were sweet and sower for peter, peter thought" 
.Split(' ', ',').Count(x=>x == "peter"); 

這是爲「彼得」，其他人重複。

Answer 3

這應該做的伎倆：

var str = "peter piper picked a pack of pickled peppers, the peppers were sweet and sower for peter, peter thought"; 
var counts = str 
    .Split(' ', ',') 
    .GroupBy(s => s) 
    .ToDictionary(g => g.Key, g => g.Count()); 

現在，詞典，counts包含你的句子單詞數對。例如，counts["peter"]爲3

Answer 4

我不知道這是否是更有效或 「資源輕」，但你可以這樣做：

string[] words = "peter piper picked a pack of pickled peppers, the peppers were sweet and sower for peter, peter thought".Split(" "); 
int peter = words.Count(x=>x == "peter"); 
int peppers = words.Count(x=>x == "peppers"); 
// etc 

Answer 5

const string s = "peter piper picked a pack of pickled peppers, the peppers were sweet and sower for peter, peter thought"; 

var wordFrequency = 
     from word in s.Split(' ') 
     group word by word 
     into wordGrouping 
     select new {wordGrouping.Key, Count = wordGrouping.Count()};