回答編集履歴
1
配列の扱いをミスってたので修正
test
CHANGED
@@ -14,7 +14,7 @@
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```C#
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-
var ary = new string()
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+
var ary = new string()["A", "B", "C", "D"];
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var joined = string.Join(ary,",");
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