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ToDictionary.cs
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ToDictionary.cs
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#region License and Terms
// MoreLINQ - Extensions to LINQ to Objects
// Copyright (c) 2017 Atif Aziz. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#endregion
namespace MoreLinq
{
using System;
using System.Collections.Generic;
using System.Linq;
static partial class MoreEnumerable
{
/// <summary>
/// Creates a <see cref="Dictionary{TKey,TValue}" /> from a sequence of
/// <see cref="KeyValuePair{TKey,TValue}" /> elements.
/// </summary>
/// <typeparam name="TKey">The type of the key.</typeparam>
/// <typeparam name="TValue">The type of the value.</typeparam>
/// <param name="source">The source sequence of key-value pairs.</param>
/// <returns>
/// A <see cref="Dictionary{TKey, TValue}"/> containing the values
/// mapped to their keys.
/// </returns>
public static Dictionary<TKey, TValue> ToDictionary<TKey, TValue>(this IEnumerable<KeyValuePair<TKey, TValue>> source) =>
source.ToDictionary(null);
/// <summary>
/// Creates a <see cref="Dictionary{TKey,TValue}" /> from a sequence of
/// <see cref="KeyValuePair{TKey,TValue}" /> elements. An additional
/// parameter specifies a comparer for keys.
/// </summary>
/// <typeparam name="TKey">The type of the key.</typeparam>
/// <typeparam name="TValue">The type of the value.</typeparam>
/// <param name="source">The source sequence of key-value pairs.</param>
/// <param name="comparer">The comparer for keys.</param>
/// <returns>
/// A <see cref="Dictionary{TKey, TValue}"/> containing the values
/// mapped to their keys.
/// </returns>
public static Dictionary<TKey, TValue> ToDictionary<TKey, TValue>(this IEnumerable<KeyValuePair<TKey, TValue>> source,
IEqualityComparer<TKey> comparer)
{
if (source == null) throw new ArgumentNullException(nameof(source));
return source.ToDictionary(e => e.Key, e => e.Value, comparer);
}
/// <summary>
/// Creates a <see cref="Dictionary{TKey,TValue}" /> from a sequence of
/// tuples of 2 where the first item is the key and the second the
/// value.
/// </summary>
/// <typeparam name="TKey">The type of the key.</typeparam>
/// <typeparam name="TValue">The type of the value.</typeparam>
/// <param name="source">The source sequence of couples (tuple of 2).</param>
/// <returns>
/// A <see cref="Dictionary{TKey, TValue}"/> containing the values
/// mapped to their keys.
/// </returns>
public static Dictionary<TKey, TValue> ToDictionary<TKey, TValue>(this IEnumerable<(TKey Key, TValue Value)> source) =>
source.ToDictionary(null);
/// <summary>
/// Creates a <see cref="Dictionary{TKey,TValue}" /> from a sequence of
/// tuples of 2 where the first item is the key and the second the
/// value. An additional parameter specifies a comparer for keys.
/// </summary>
/// <typeparam name="TKey">The type of the key.</typeparam>
/// <typeparam name="TValue">The type of the value.</typeparam>
/// <param name="source">The source sequence of couples (tuple of 2).</param>
/// <param name="comparer">The comparer for keys.</param>
/// <returns>
/// A <see cref="Dictionary{TKey, TValue}"/> containing the values
/// mapped to their keys.
/// </returns>
public static Dictionary<TKey, TValue> ToDictionary<TKey, TValue>(this IEnumerable<(TKey Key, TValue Value)> source,
IEqualityComparer<TKey> comparer)
{
if (source == null) throw new ArgumentNullException(nameof(source));
return source.ToDictionary(e => e.Key, e => e.Value, comparer);
}
}
}