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annotate Chronosv2/source/Extensions/CollectionExtensions.cs @ 10:443821e55f06

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author stevenh7776 stevenhollidge@hotmail.com
date Tue, 21 Feb 2012 17:25:44 +0700
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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 Chronos.Extensions
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5 {
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6 /// <summary>
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7 /// Extension methods for all kind of Collections implementing the ICollection&lt;T&gt; interface
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8 /// </summary>
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9 public static class CollectionExtensions
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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 /// Adds a value uniquely to to a collection and returns a value whether the value was added or not.
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15 /// </summary>
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16 /// <typeparam name="T">The generic collection value type</typeparam>
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17 /// <param name="collection">The collection.</param>
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18 /// <param name="value">The value to be added.</param>
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19 /// <returns>Indicates whether the value was added or not</returns>
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20 /// <example><code>
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21 /// list.AddUnique(1); // returns true;
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22 /// list.AddUnique(1); // returns false the second time;
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23 /// </code></example>
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24 public static bool AddUnique<T>(this ICollection<T> collection, T value)
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25 {
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26 if (!collection.Contains(value))
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27 {
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28 collection.Add(value);
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29 return true;
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30 }
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31
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32 return false;
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33 }
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34
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35 /// <summary>
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36 /// Adds a range of value uniquely to a collection and returns the amount of values added.
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37 /// </summary>
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38 /// <typeparam name="T">The generic collection value type.</typeparam>
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39 /// <param name="collection">The collection.</param>
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40 /// <param name="values">The values to be added.</param>
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41 /// <returns>The amount if values that were added.</returns>
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42 public static int AddRangeUnique<T>(this ICollection<T> collection, IEnumerable<T> values)
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43 {
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44 var count = 0;
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45
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46 foreach (var value in values)
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47 {
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48 if (collection.AddUnique(value))
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49 {
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50 count++;
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51 }
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52 }
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53
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54 return count;
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55 }
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56
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57 public static void AddRange<T>(this ICollection<T> collection, IEnumerable<T> values)
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58 {
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59 foreach (T value in values)
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60 {
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61 collection.Add(value);
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62 }
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63 }
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64
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65 #endregion
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66 }
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67 }