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在C#中要統計一個字符出現在字符串中的次數我們有N種實現方法，下面我總結了幾種統計字符串出現資次數實例與大家分享。例1代碼如下 復制代碼計算一個字符串中的某個子串出現的次數，有沒有好的方法？/// <summary>/// 計算字符串中子串出現的次數/// </summary>/// <param name=”str”>字符串</param>/// <param name=”substring”>子串</param>/// <returns>出現的次數</returns>static int SubstringCount(string str, string substring){if (str.Contains(substring)){string strReplaced = str.Replace(substring, “”);return (str.Length – strReplaced.Length) / substring.Length;}return 0;}int count = SubstringCount(“ddddfdfhgfjghjhgjghjhjhjhjhj”, “gh”);例2 哈希表代碼如下 復制代碼Hashtable ht = new Hashtable();string sr = "aaabbcddddd";char[] cr = sr.ToCharArray();foreach (char ch in cr){if (ht.ContainsKey(ch)){int i = (int)ht[ch];ht.Remove(ch);ht.Add(ch, ++i);}elseht.Add(ch, 1);}foreach (DictionaryEntry dicEntry in ht){Console.WriteLine("{0}出現{1}次", dicEntry.Key, dicEntry.Value);}ArrayList alist = new ArrayList(ht.Values);alist.Sort();object o = (object)alist[alist.Count - 1];foreach (DictionaryEntry dicEntry in ht){if (dicEntry.Value == o){string str = dicEntry.Key.ToString();Console.WriteLine("出現次數最多的字符:{0}，共{1}次", str, o.ToString());break;}}Console.ReadLine();例3 linq代碼如下 復制代碼string s = "aaabccccef";char[] c = s.ToCharArray();var cc = c.GroupBy(e => e).OrderByDescending(e => e.Count()).ToList();for (int i = 0; i < cc.Count; i++){Console.WriteLine("{0}t{1}", cc[i].Key.ToString(), cc[i].Count().ToString());}var ccc = c.GroupBy(e => e).OrderByDescending(e => e.Count()).First().ToList();Console.WriteLine("{0}出現{1}次！", ccc[0].ToString(), ccc.Count().ToString());Console.ReadKey();在C#中要統計一個字符出現在字符串中的次數我們有N種實現方法，下面我總結了幾種統計字符串出現資次數實例與大家分享。例1代碼如下 復制代碼計算一個字符串中的某個子串出現的次數，有沒有好的方法？/// <summary>/// 計算字符串中子串出現的次數/// </summary>/// <param name=”str”>字符串</param>/// <param name=”substring”>子串</param>/// <returns>出現的次數</returns>static int SubstringCount(string str, string substring){if (str.Contains(substring)){string strReplaced = str.Replace(substring, “”);return (str.Length – strReplaced.Length) / substring.Length;}return 0;}int count = SubstringCount(“ddddfdfhgfjghjhgjghjhjhjhjhj”, “gh”);例2 哈希表代碼如下 復制代碼Hashtable ht = new Hashtable();string sr = "aaabbcddddd";char[] cr = sr.ToCharArray();foreach (char ch in cr){if (ht.ContainsKey(ch)){int i = (int)ht[ch];ht.Remove(ch);ht.Add(ch, ++i);}elseht.Add(ch, 1);}foreach (DictionaryEntry dicEntry in ht){Console.WriteLine("{0}出現{1}次", dicEntry.Key, dicEntry.Value);}ArrayList alist = new ArrayList(ht.Values);alist.Sort();object o = (object)alist[alist.Count - 1];foreach (DictionaryEntry dicEntry in ht){if (dicEntry.Value == o){string str = dicEntry.Key.ToString();Console.WriteLine("出現次數最多的字符:{0}，共{1}次", str, o.ToString());break;}}Console.ReadLine();例3 linq代碼如下 復制代碼string s = "aaabccccef";char[] c = s.ToCharArray();var cc = c.GroupBy(e => e).OrderByDescending(e => e.Count()).ToList();for (int i = 0; i < cc.Count; i++){Console.WriteLine("{0}t{1}", cc[i].Key.ToString(), cc[i].Count().ToString());}var ccc = c.GroupBy(e => e).OrderByDescending(e => e.Count()).First().ToList();Console.WriteLine("{0}出現{1}次！", ccc[0].ToString(), ccc.Count().ToString());Console.ReadKey();