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Imported Upstream version 4.0.0~alpha1
Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9
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40
external/referencesource/System.Web/ModelBinding/DictionaryHelpers.cs
vendored
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40
external/referencesource/System.Web/ModelBinding/DictionaryHelpers.cs
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namespace System.Web.ModelBinding {
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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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internal static class DictionaryHelpers {
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public static IEnumerable<KeyValuePair<string, TValue>> FindKeysWithPrefix<TValue>(IDictionary<string, TValue> dictionary, string prefix) {
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TValue exactMatchValue;
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if (dictionary.TryGetValue(prefix, out exactMatchValue)) {
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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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string key = entry.Key;
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if (key.Length <= prefix.Length) {
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continue;
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}
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if (!key.StartsWith(prefix, StringComparison.OrdinalIgnoreCase)) {
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continue;
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}
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char charAfterPrefix = key[prefix.Length];
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switch (charAfterPrefix) {
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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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public static bool DoesAnyKeyHavePrefix<TValue>(IDictionary<string, TValue> dictionary, string prefix) {
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return FindKeysWithPrefix(dictionary, prefix).Any();
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}
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}
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}
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