回答編集履歴
1
追記
test
CHANGED
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@@ -72,3 +72,64 @@
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72
72
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A1004
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73
73
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A1006 - A1010
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74
74
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```
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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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+
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78
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+
[追記]
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79
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質問文のコードをなるべく使うようにするなら，例えばこんな感じでどうでしょう？
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80
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+
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81
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```C#
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82
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private void CheckSerial( List<string> list )
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83
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{
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84
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var GroupLastIndexes = new List<int>(); //←名称変更，要素をintに変更．ここに連番グループの末尾要素のindexを収集することを考える．
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85
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string number = "";
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86
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+
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87
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for (int i = 0; i <= list.Count(); i++)
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88
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{
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89
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if (i == list.Count() - 1)
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90
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{
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91
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break;
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92
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}
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93
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+
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94
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int first = int.Parse(list[i].Substring(1, 4));
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95
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int second = int.Parse(list[i + 1].Substring(1, 4));
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96
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+
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97
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if (first + 1 == second)
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98
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{
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99
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+
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100
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}
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101
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else
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102
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{
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103
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GroupLastIndexes.Add( i ); //← i をAddするように変更
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104
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}
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105
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}
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106
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+
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107
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if (GroupLastIndexes.Count() == 0)
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108
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{
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109
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string first = list.First();
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110
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string last = list.Last();
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111
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112
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number = first + "～" + last;
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113
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}
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114
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else //elseの処理を追加
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115
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{
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116
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GroupLastIndexes.Add( list.Count()-1 );
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117
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+
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118
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int iGroupStart = 0;
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119
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foreach( int iGroupLast in GroupLastIndexes )
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120
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{
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121
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if( number.Any() )number += " , ";
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122
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+
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123
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if( iGroupStart == iGroupLast )
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124
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{ number += list[iGroupStart]; }
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125
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else
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126
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{ number += list[iGroupStart] + "～" + list[iGroupLast]; }
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127
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+
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128
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iGroupStart = iGroupLast+1;
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129
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}
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130
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}
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131
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+
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132
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//※確認用に number の表示を追加
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133
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Console.WriteLine( number );
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134
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}
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135
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```
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