回答編集履歴
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見直しキャンペーン中
test
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`return $"{dt:yyyy年}";`が一番スッキリしてるんじゃないですかね。
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```
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```cs
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using Microsoft.VisualStudio.TestTools.UnitTesting;
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using System;
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namespace Questions323920
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{
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class A
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{
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public static string GetDisplayYear(DateTime? dt)
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{
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return $"{dt:yyyy年}";
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//return dt?.ToString("yyyy年") ?? "";
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//return dt.HasValue ? dt?.Year + "年" : "";
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}
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}
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[TestClass()]
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public class ATests
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{
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[TestMethod()]
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public void GetDisplayYearTest()
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{
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Assert.AreEqual("2021年", A.GetDisplayYear(DateTime.Parse("2021/02/21 23:00:00")));
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Assert.AreEqual("", A.GetDisplayYear(null));
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}
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}
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}
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```
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