Imported Upstream version 4.0.0~alpha1

Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9
This commit is contained in:
Jo Shields
2015-04-07 09:35:12 +01:00
parent 283343f570
commit 3c1f479b9d
22469 changed files with 2931443 additions and 869343 deletions

View File

@ -0,0 +1,40 @@
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();
}
}
}