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comparison MetroWpf/MetroWpf.Framework/Extensions/ComparableExtensions.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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14:741981715d94 15:060f02cd4591
1 using System;
2 using System.Collections.Generic;
3
4 namespace MetroWpf
5 {
6 /// <summary>
7 /// Extension methods for all comparable objects eg. string, DateTime, numeric values ...
8 /// </summary>
9 public static class ComparableExtensions
10 {
11
12 /// <summary>
13 /// Determines whether the specified value is between the the defined minimum and maximum range (including those values).
14 /// </summary>
15 /// <typeparam name="T"></typeparam>
16 /// <param name="value">The value.</param>
17 /// <param name="minValue">The minimum value.</param>
18 /// <param name="maxValue">The maximum value.</param>
19 /// <returns>
20 /// <c>true</c> if the specified value is between min and max; otherwise, <c>false</c>.
21 /// </returns>
22 /// <example>
23 /// var value = 5;
24 /// if(value.IsBetween(1, 10)) {
25 /// // ...
26 /// }
27 /// </example>
28 public static bool IsBetween<T>(this T value, T minValue, T maxValue) where T : IComparable<T>
29 {
30 return IsBetween(value, minValue, maxValue, null);
31 }
32
33 /// <summary>
34 /// Determines whether the specified value is between the the defined minimum and maximum range (including those values).
35 /// </summary>
36 /// <typeparam name="T"></typeparam>
37 /// <param name="value">The value.</param>
38 /// <param name="minValue">The minimum value.</param>
39 /// <param name="maxValue">The maximum value.</param>
40 /// <param name="comparer">An optional comparer to be used instead of the types default comparer.</param>
41 /// <returns>
42 /// <c>true</c> if the specified value is between min and max; otherwise, <c>false</c>.
43 /// </returns>
44 /// <example>
45 /// var value = 5;
46 /// if(value.IsBetween(1, 10)) {
47 /// // ...
48 /// }
49 /// </example>
50 public static bool IsBetween<T>(this T value, T minValue, T maxValue, IComparer<T> comparer) where T : IComparable<T>
51 {
52 comparer = comparer ?? Comparer<T>.Default;
53
54 var minMaxCompare = comparer.Compare(minValue, maxValue);
55 if (minMaxCompare < 0)
56 {
57 return ((comparer.Compare(value, minValue) >= 0) && (comparer.Compare(value, maxValue) <= 0));
58 }
59 else if (minMaxCompare == 0)
60 {
61 return (comparer.Compare(value, minValue) == 0);
62 }
63 else
64 {
65 return ((comparer.Compare(value, maxValue) >= 0) && (comparer.Compare(value, minValue) <= 0));
66 }
67 }
68 }
69 }