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annotate MetroWpf/MetroWpf.Framework/Extensions/LinqExtensions.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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1 using System;
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2 using System.Collections.Generic;
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3 using System.Linq.Expressions;
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4
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5 namespace MetroWpf
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6 {
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7 public static class LinqExtensions
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8 {
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9 #region · Extensions ·
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10
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11 /// <summary>
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12 /// Traverses the specified source.
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13 /// </summary>
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14 /// <typeparam name="T"></typeparam>
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15 /// <param name="source">The source.</param>
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16 /// <param name="fnRecurse">The fn recurse.</param>
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17 /// <returns></returns>
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18 public static IEnumerable<T> Traverse<T>(this IEnumerable<T> source, Func<T, IEnumerable<T>> fnRecurse)
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19 {
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20 foreach (T item in source)
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21 {
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22 yield return item;
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23
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24 IEnumerable<T> seqRecurse = fnRecurse(item);
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25
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26 if (seqRecurse != null)
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27 {
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28 foreach (T itemRecurse in Traverse(seqRecurse, fnRecurse))
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29 {
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30 yield return itemRecurse;
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31 }
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32 }
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33 }
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34 }
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35
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36 #endregion
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37 }
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38 }