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annotate MetroWpf/MetroWpf.Framework/Extensions/ListExtensions.cs @ 15:060f02cd4591

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author stevenh7776 stevenhollidge@hotmail.com
date Mon, 12 Mar 2012 23:05:21 +0800
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15
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1 using System;
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2 using System.Collections.Generic;
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3
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4 namespace MetroWpf
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5 {
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6 /// <summary>
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7 /// Extension methods for all kind of Lists implementing the IList&lt;T&gt; interface
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8 /// </summary>
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9 public static class ListExtensions
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10 {
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11 #region · Extensions ·
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12
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13 /// <summary>
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14 /// Inserts an item uniquely to to a list and returns a value whether the item was inserted or not.
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15 /// </summary>
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16 /// <typeparam name="T">The generic list item type.</typeparam>
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17 /// <param name="list">The list to be inserted into.</param>
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18 /// <param name="index">The index to insert the item at.</param>
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19 /// <param name="item">The item to be added.</param>
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20 /// <returns>Indicates whether the item was inserted or not</returns>
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21 public static bool InsertUnqiue<T>(this IList<T> list, int index, T item)
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22 {
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23 if (list.Contains(item) == false)
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24 {
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25 list.Insert(index, item);
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26 return true;
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27 }
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28
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29 return false;
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30 }
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31
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32 /// <summary>
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33 /// Inserts a range of items uniquely to a list starting at a given index and returns the amount of items inserted.
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34 /// </summary>
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35 /// <typeparam name="T">The generic list item type.</typeparam>
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36 /// <param name="list">The list to be inserted into.</param>
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37 /// <param name="startIndex">The start index.</param>
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38 /// <param name="items">The items to be inserted.</param>
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39 /// <returns>The amount if items that were inserted.</returns>
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40 public static int InsertRangeUnique<T>(this IList<T> list, int startIndex, IEnumerable<T> items)
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41 {
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42 var index = startIndex;
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43
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44 foreach (var item in items)
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45 {
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46 if (list.InsertUnqiue(startIndex, item))
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47 {
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48 index++;
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49 }
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50 }
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51
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52 return (index - startIndex);
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53 }
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54
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55 /// <summary>
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56 /// Return the index of the first matching item or -1.
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57 /// </summary>
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58 /// <typeparam name="T"></typeparam>
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59 /// <param name="list">The list.</param>
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60 /// <param name="comparison">The comparison.</param>
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61 /// <returns>The item index</returns>
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62 public static int IndexOf<T>(this IList<T> list, Func<T, bool> comparison)
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63 {
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64 for (var i = 0; i < list.Count; i++)
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65 {
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66 if (comparison(list[i]))
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67 {
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68 return i;
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69 }
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70 }
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71
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72 return -1;
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73 }
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74
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75 #endregion
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76 }
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77 }