mcs/class/System.Web.Mvc3/Mvc/DictionaryHelpers.cs

   1 namespace System.Web.Mvc {
   2     using System;
   3     using System.Collections.Generic;
   4     using System.Linq;
   5
   6     internal static class DictionaryHelpers {
   7
   8         public static IEnumerable<KeyValuePair<string, TValue>> FindKeysWithPrefix<TValue>(IDictionary<string, TValue> dictionary, string prefix) {
   9             TValue exactMatchValue;
  10             if (dictionary.TryGetValue(prefix, out exactMatchValue)) {
  11                 yield return new KeyValuePair<string, TValue>(prefix, exactMatchValue);
  12             }
  13
  14             foreach (var entry in dictionary) {
  15                 string key = entry.Key;
  16
  17                 if (key.Length <= prefix.Length) {
  18                     continue;
  19                 }
  20
  21                 if (!key.StartsWith(prefix, StringComparison.OrdinalIgnoreCase)) {
  22                     continue;
  23                 }
  24
  25                 char charAfterPrefix = key[prefix.Length];
  26                 switch (charAfterPrefix) {
  27                     case '[':
  28                     case '.':
  29                         yield return entry;
  30                         break;
  31                 }
  32             }
  33         }
  34
  35         public static bool DoesAnyKeyHavePrefix<TValue>(IDictionary<string, TValue> dictionary, string prefix) {
  36             return FindKeysWithPrefix(dictionary, prefix).Any();
  37         }
  38
  39     }
  40 }