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FormValueProvider.cs
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FormValueProvider.cs
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// Copyright (c) .NET Foundation. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
using System;
using System.Collections.Generic;
using System.Globalization;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc.Internal;
namespace Microsoft.AspNetCore.Mvc.ModelBinding
{
/// <summary>
/// An <see cref="IValueProvider"/> adapter for data stored in an <see cref="IFormCollection"/>.
/// </summary>
public class FormValueProvider : BindingSourceValueProvider, IEnumerableValueProvider
{
private readonly CultureInfo _culture;
private readonly IFormCollection _values;
private PrefixContainer _prefixContainer;
/// <summary>
/// Creates a value provider for <see cref="IFormCollection"/>.
/// </summary>
/// <param name="bindingSource">The <see cref="BindingSource"/> for the data.</param>
/// <param name="values">The key value pairs to wrap.</param>
/// <param name="culture">The culture to return with ValueProviderResult instances.</param>
public FormValueProvider(
BindingSource bindingSource,
IFormCollection values,
CultureInfo culture)
: base(bindingSource)
{
if (bindingSource == null)
{
throw new ArgumentNullException(nameof(bindingSource));
}
if (values == null)
{
throw new ArgumentNullException(nameof(values));
}
_values = values;
_culture = culture;
}
public CultureInfo Culture => _culture;
protected PrefixContainer PrefixContainer
{
get
{
if (_prefixContainer == null)
{
_prefixContainer = new PrefixContainer(_values.Keys);
}
return _prefixContainer;
}
}
/// <inheritdoc />
public override bool ContainsPrefix(string prefix)
{
return PrefixContainer.ContainsPrefix(prefix);
}
/// <inheritdoc />
public virtual IDictionary<string, string> GetKeysFromPrefix(string prefix)
{
if (prefix == null)
{
throw new ArgumentNullException(nameof(prefix));
}
return PrefixContainer.GetKeysFromPrefix(prefix);
}
/// <inheritdoc />
public override ValueProviderResult GetValue(string key)
{
if (key == null)
{
throw new ArgumentNullException(nameof(key));
}
var values = _values[key];
if (values.Count == 0)
{
return ValueProviderResult.None;
}
else
{
return new ValueProviderResult(values, _culture);
}
}
}
}