71 lines
2.3 KiB
C#
71 lines
2.3 KiB
C#
// Copyright (c) .NET Foundation. 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.Collections.Generic;
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using System.Globalization;
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using System.Threading.Tasks;
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using Microsoft.Framework.Internal;
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namespace Microsoft.AspNet.Mvc.ModelBinding
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{
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/// <summary>
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/// An <see cref="IValueProvider"/> adapter for data stored in an
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/// <see cref="IDictionary{string, object}"/>.
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/// </summary>
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public class DictionaryBasedValueProvider: BindingSourceValueProvider
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{
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private readonly IDictionary<string, object> _values;
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private PrefixContainer _prefixContainer;
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/// <summary>
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/// Creates a new <see cref="DictionaryBasedValueProvider"/>.
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/// </summary>
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/// <param name="bindingSource">The <see cref="BindingSource"/> of the data.</param>
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/// <param name="values">The values.</param>
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public DictionaryBasedValueProvider(
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[NotNull] BindingSource bindingSource,
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[NotNull] IDictionary<string, object> values)
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: base(bindingSource)
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{
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_values = values;
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}
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protected PrefixContainer PrefixContainer
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{
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get
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{
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if (_prefixContainer == null)
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{
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_prefixContainer = new PrefixContainer(_values.Keys);
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}
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return _prefixContainer;
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}
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}
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/// <inheritdoc />
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public override Task<bool> ContainsPrefixAsync(string key)
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{
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return Task.FromResult(PrefixContainer.ContainsPrefix(key));
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}
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/// <inheritdoc />
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public override Task<ValueProviderResult> GetValueAsync([NotNull] string key)
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{
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object value;
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ValueProviderResult result;
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if (_values.TryGetValue(key, out value))
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{
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var stringValue = value as string ?? value?.ToString() ?? string.Empty;
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result = new ValueProviderResult(stringValue, CultureInfo.InvariantCulture);
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}
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else
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{
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result = ValueProviderResult.None;
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}
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return Task.FromResult(result);
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}
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}
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}
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