回答編集履歴
2
追記
answer
CHANGED
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@@ -63,4 +63,28 @@
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63
63
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fruits.AddRange(oranges);
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64
64
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65
65
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var result = fruits.Distinct().ToList();
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66
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-
```
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66
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+
```
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67
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+
--- 追記 --
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68
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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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69
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+
``` C#
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70
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+
class FruitsEqualtyComparer : IEqualityComparer<IFruits>
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71
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{
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72
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public bool Equals(IFruits x, IFruits y)
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73
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{
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74
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return x.Price == y.Price && x.Weight == y.Weight;
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75
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+
}
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76
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+
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77
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public int GetHashCode(IFruits obj)
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78
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{
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79
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return obj.Price.GetHashCode() ^ obj.Weight.GetHashCode();
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80
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+
}
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81
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+
}
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82
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+
```
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83
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+
``` C#
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84
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var fruits2 = new List<IFruits>();
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85
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fruits2.AddRange(apples);
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86
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+
fruits2.AddRange(oranges);
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87
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+
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88
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+
var result2 = fruits.Distinct(new FruitsEqualtyComparer()).ToList();
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89
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+
```
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90
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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
answer
CHANGED
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@@ -6,13 +6,18 @@
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6
6
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decimal Price { get; set; }
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7
7
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}
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8
8
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9
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-
class EquatableFruits : IFruits, IEquatable<
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9
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+
class EquatableFruits : IFruits, IEquatable<EquatableFruits>
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10
10
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{
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11
11
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public decimal Weight { get; set; }
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12
12
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public decimal Price { get; set; }
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13
13
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14
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-
public
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14
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+
public override int GetHashCode()
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15
15
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{
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16
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+
return Weight.GetHashCode() ^ Price.GetHashCode();
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17
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+
}
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18
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+
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19
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+
public virtual bool Equals(EquatableFruits other)
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20
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{
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16
21
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return
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17
22
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this.Price == other.Price
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18
23
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&&
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@@ -34,9 +39,26 @@
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34
39
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``` C#
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35
40
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var fruits = new List<EquatableFruits>();
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36
41
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37
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-
var apples = new List<Apple>
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42
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+
var apples = new List<Apple>
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43
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+
{
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44
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new Apple
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45
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+
{
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46
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+
Price = 100,
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47
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+
Weight = 200,
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38
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-
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48
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+
WithHoney = true
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49
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+
}
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50
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+
};
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39
51
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52
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+
var oranges = new List<Orange>
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53
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+
{
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54
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new Orange
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55
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+
{
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56
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Price = 100,
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57
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+
IsNoSeed = true,
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58
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+
Weight = 200
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59
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+
}
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60
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+
};
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61
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+
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40
62
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fruits.AddRange(apples);
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41
63
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fruits.AddRange(oranges);
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42
64
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