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  1. using System;
  2. using System.Collections.Generic;
  3.  
  4.     public static class GenericParser
  5.     {
  6.         //create a delegate which our parsers will use 
  7.         private delegate bool Parser(string source, out object result);
  8.  
  9.         //This is the list of our parsers
  10.         private static readonly List<Parser> Parsers = new List<Parser>
  11.         {
  12.             new Parser(ParseInt),
  13.             new Parser(ParseDouble),
  14.             new Parser(ParseBool),
  15.             new Parser(ParseString)
  16.         };
  17.  
  18.         public static object Parse(string source)
  19.         {
  20.             object result;
  21.             foreach (Parser parser in Parsers)
  22.             {
  23.                 //return the result if the parser succeeded.
  24.                 if (parser(source, out result))
  25.                     return result;
  26.             }
  27.  
  28.             //return null if all of the parsers failed (should never happen because the string->string parser can't fail.)
  29.             return null;
  30.         }
  31.  
  32.         private static bool ParseInt(string source, out object result)
  33.         {
  34.             int tmp;
  35.             bool success = int.TryParse(source, out tmp);
  36.             result = tmp;
  37.             return success;
  38.         }
  39.  
  40.         private static bool ParseDouble(string source, out object result)
  41.         {
  42.             double tmp;
  43.             bool success = double.TryParse(source, out tmp);
  44.             result = tmp;
  45.             return success;
  46.         }
  47.  
  48.         private static bool ParseBool(string source, out object result)
  49.         {
  50.             bool tmp;
  51.             bool success = bool.TryParse(source, out tmp);
  52.             result = tmp;
  53.             return success;
  54.         }
  55.  
  56.         private static bool ParseString(string source, out object result)
  57.         {
  58.             result = source;
  59.             return true;
  60.         }
  61.     }
  62.  
  63.     public class Test
  64.     {
  65.         static void Main(string[] args)
  66.         {
  67.             TestString("2");
  68.             TestString("2.0");
  69.             TestString("true");
  70.             TestString("nnn");
  71.         }
  72.  
  73.         static void TestString(string testString)
  74.         {
  75.             object result = GenericParser.Parse(testString);
  76.             Console.WriteLine("\"{0}\"\t => {1}", testString, result.GetType().Name);
  77.         }
  78.     }
Success #stdin #stdout 0.06s 34056KB
comments (?)
stdin 
Standard input is empty
stdout 
"2"	 => Int32
"2.0"	 => Double
"true"	 => Boolean
"nnn"	 => String
https://ideone.com/r0kEJc
language:
C# (gmcs 5.20.1)
created:
11 years ago
visibility:
public

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