回答編集履歴
2
追記
test
CHANGED
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@@ -129,3 +129,51 @@
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129
129
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var result = fruits.Distinct().ToList();
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130
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```
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132
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+
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133
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--- 追記 --
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134
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135
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あるいは基底クラス(EquatableFruits)を用いずにIFruitsの比較クラスを用意して
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136
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137
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``` C#
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138
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139
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class FruitsEqualtyComparer : IEqualityComparer<IFruits>
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140
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{
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142
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public bool Equals(IFruits x, IFruits y)
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144
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{
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146
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return x.Price == y.Price && x.Weight == y.Weight;
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148
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}
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150
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public int GetHashCode(IFruits obj)
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{
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return obj.Price.GetHashCode() ^ obj.Weight.GetHashCode();
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}
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160
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}
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162
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163
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```
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165
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``` C#
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166
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167
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var fruits2 = new List<IFruits>();
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168
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fruits2.AddRange(apples);
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170
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fruits2.AddRange(oranges);
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var result2 = fruits.Distinct(new FruitsEqualtyComparer()).ToList();
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```
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179
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のほうが汎用的かもしれません。
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1
EquatableFruits の実装ミス修正
test
CHANGED
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@@ -14,7 +14,7 @@
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14
14
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15
15
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16
16
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17
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-
class EquatableFruits : IFruits, IEquatable<
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class EquatableFruits : IFruits, IEquatable<EquatableFruits>
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{
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@@ -24,7 +24,17 @@
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public override int GetHashCode()
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{
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30
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31
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return Weight.GetHashCode() ^ Price.GetHashCode();
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}
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34
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35
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27
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-
public bool Equals(
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37
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public virtual bool Equals(EquatableFruits other)
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{
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30
40
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@@ -70,9 +80,43 @@
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70
80
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71
81
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72
82
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73
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var apples = new List<Apple>
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var apples = new List<Apple>
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{
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new Apple
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{
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90
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91
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Price = 100,
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93
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Weight = 200,
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94
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95
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WithHoney = true
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}
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};
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100
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101
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102
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75
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-
var oranges = new List<Orange>
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var oranges = new List<Orange>
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105
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{
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106
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107
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new Orange
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108
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109
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{
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110
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111
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Price = 100,
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112
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113
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IsNoSeed = true,
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Weight = 200
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}
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};
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76
120
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78
122
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