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namespace System.Web.ModelBinding {
using System;
using System.Collections.Generic;
using System.Linq;
internal static class DictionaryHelpers {
public static IEnumerable<KeyValuePair<string, TValue>> FindKeysWithPrefix<TValue>(IDictionary<string, TValue> dictionary, string prefix) {
TValue exactMatchValue;
if (dictionary.TryGetValue(prefix, out exactMatchValue)) {
yield return new KeyValuePair<string, TValue>(prefix, exactMatchValue);
}
foreach (var entry in dictionary) {
string key = entry.Key;
if (key.Length <= prefix.Length) {
continue;
}
if (!key.StartsWith(prefix, StringComparison.OrdinalIgnoreCase)) {
continue;
}
char charAfterPrefix = key[prefix.Length];
switch (charAfterPrefix) {
case '[':
case '.':
yield return entry;
break;
}
}
}
public static bool DoesAnyKeyHavePrefix<TValue>(IDictionary<string, TValue> dictionary, string prefix) {
return FindKeysWithPrefix(dictionary, prefix).Any();
}
}
}
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