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comparison Chronosv2/source/Extensions/ListExtensions.cs @ 10:443821e55f06

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Initial cleaned up add from Codeplex files
author stevenh7776 stevenhollidge@hotmail.com
date Tue, 21 Feb 2012 17:25:44 +0700
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9:904a9faadf8b 10:443821e55f06
1 using System;
2 using System.Collections.Generic;
3
4 namespace Chronos.Extensions
5 {
6 /// <summary>
7 /// Extension methods for all kind of Lists implementing the IList&lt;T&gt; interface
8 /// </summary>
9 public static class ListExtensions
10 {
11 #region · Extensions ·
12
13 /// <summary>
14 /// Inserts an item uniquely to to a list and returns a value whether the item was inserted or not.
15 /// </summary>
16 /// <typeparam name="T">The generic list item type.</typeparam>
17 /// <param name="list">The list to be inserted into.</param>
18 /// <param name="index">The index to insert the item at.</param>
19 /// <param name="item">The item to be added.</param>
20 /// <returns>Indicates whether the item was inserted or not</returns>
21 public static bool InsertUnqiue<T>(this IList<T> list, int index, T item)
22 {
23 if (list.Contains(item) == false)
24 {
25 list.Insert(index, item);
26 return true;
27 }
28
29 return false;
30 }
31
32 /// <summary>
33 /// Inserts a range of items uniquely to a list starting at a given index and returns the amount of items inserted.
34 /// </summary>
35 /// <typeparam name="T">The generic list item type.</typeparam>
36 /// <param name="list">The list to be inserted into.</param>
37 /// <param name="startIndex">The start index.</param>
38 /// <param name="items">The items to be inserted.</param>
39 /// <returns>The amount if items that were inserted.</returns>
40 public static int InsertRangeUnique<T>(this IList<T> list, int startIndex, IEnumerable<T> items)
41 {
42 var index = startIndex;
43
44 foreach (var item in items)
45 {
46 if (list.InsertUnqiue(startIndex, item))
47 {
48 index++;
49 }
50 }
51
52 return (index - startIndex);
53 }
54
55 /// <summary>
56 /// Return the index of the first matching item or -1.
57 /// </summary>
58 /// <typeparam name="T"></typeparam>
59 /// <param name="list">The list.</param>
60 /// <param name="comparison">The comparison.</param>
61 /// <returns>The item index</returns>
62 public static int IndexOf<T>(this IList<T> list, Func<T, bool> comparison)
63 {
64 for (var i = 0; i < list.Count; i++)
65 {
66 if (comparison(list[i]))
67 {
68 return i;
69 }
70 }
71
72 return -1;
73 }
74
75 #endregion
76 }
77 }