Example of the number of occurrences of a string in a C # statistic string

Example 1

code is as follows

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To compute the occurrence of a substring in a string Number of times, is there a good way? ///<summary> ///calculates the number of occurrences of a string substring ///</summary> ///<param "str" > String name= ///<param name= "substring" > substring </param> ///<returns> occurrences </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");

Example 2 hash table

The code is as follows

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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); } Else Ht. ADD (CH, 1); } foreach (DictionaryEntry dicentry in HT) { Console.WriteLine ("{0} appears {1} times", 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 ("The most frequent characters: {0}, total {1} times", str, o.tostring ()); Break } } Console.ReadLine ();

Example 3 LINQ

The code is as follows

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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 ()). A (). ToList (); Console.WriteLine ("{0}" appears {1} times!) ", Ccc[0]. ToString (), CCC. Count (). ToString ()); Console.readkey ();