Mega Code Archive
Returns the index of the first occurrence in a sequence by using the default equality comparer
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//The MIT License (MIT)
//http://arolibraries.codeplex.com/license
using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading;
namespace AroLibraries.ExtensionMethods.Enumerable
{
public static class IEnumerableExt
{
/// <summary> Returns the index of the first occurrence in a sequence by using aspecified IEqualityComparer.
/// </summary> ///
/// <typeparam name="TSource">The type of the elements of source.</typeparam>
/// <param name="list">A sequence in which to locate a value.</param> ///
/// <param name="value">The object to locate in the sequence</param> /// <param name="comparer">An equality comparer to compare values.</param>
/// <returns>The zero-based index of the first occurrence of value within the entire sequence, if found; otherwise, –1.</returns>
public static int Ext_IndexOf<TSource>(this IEnumerable<TSource> list, TSource value, IEqualityComparer<TSource> comparer)
{
int index = 0;
foreach (var item in list)
{
if (comparer.Equals(item, value))
{
return index;
}
index++;
}
return -1;
}
/// <summary> Returns the index of the first occurrence in a sequence by using the default equality comparer.
///</summary>
/// <typeparam name="TSource">The type of the elements of source.</typeparam>
/// <param name="list">A sequence in which to locate a value.</param>
/// <param name="value">The object to locate in the sequence</param>
/// <returns>The zero-based index of the first occurrence of value within the entire sequence, if found; otherwise, –1.</returns>
public static int Ext_IndexOf<TSource>(this IEnumerable<TSource> list, TSource value)
where TSource : IEquatable<TSource>
{
return list.Ext_IndexOf<TSource>(value, EqualityComparer<TSource>.Default);
}
}
}
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