67 lines
2.1 KiB
C#
67 lines
2.1 KiB
C#
// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved.
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// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using Microsoft.Framework.Internal;
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namespace Microsoft.AspNet.Mvc.ModelBinding.Internal
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{
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public static class DictionaryHelper
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{
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public static IEnumerable<KeyValuePair<string, TValue>> FindKeysWithPrefix<TValue>(
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[NotNull] IDictionary<string, TValue> dictionary,
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[NotNull] string prefix)
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{
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TValue exactMatchValue;
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if (dictionary.TryGetValue(prefix, out exactMatchValue))
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{
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yield return new KeyValuePair<string, TValue>(prefix, exactMatchValue);
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}
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foreach (var entry in dictionary)
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{
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var key = entry.Key;
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if (key.Length <= prefix.Length)
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{
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continue;
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}
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if (key.StartsWith("[", StringComparison.OrdinalIgnoreCase))
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{
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key = key.Substring(key.IndexOf('.') + 1);
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if (string.Equals(prefix, key, StringComparison.Ordinal))
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{
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yield return entry;
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continue;
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}
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}
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if (!key.StartsWith(prefix, StringComparison.OrdinalIgnoreCase))
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{
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continue;
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}
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// Everything is prefixed by the empty string
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if (prefix.Length == 0)
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{
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yield return entry;
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}
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else
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{
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var charAfterPrefix = key[prefix.Length];
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switch (charAfterPrefix)
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{
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case '[':
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case '.':
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yield return entry;
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break;
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}
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}
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}
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}
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}
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}
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