回答編集履歴
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本当に質問分のとおり、書いてあって、追記のとおりの修正をしたのなら、そういう動作にはならないと思います。`+` `+=`が使われていないかご確認ください。
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```csharp
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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using ClosedXML.Excel;
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namespace ConsoleApp1
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{
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class Program
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{
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static void Main(string[] args)
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{
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var path = @"book.xlsx";
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//var path = @"C:..デスクトップ..\ConsoleApp1\ConsoleApp1\bin\Debug\book.xlsx";
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// Excelファイルを読み込み
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using (var book = new XLWorkbook(path, XLEventTracking.Disabled))
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{
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var sheet = book.Worksheet("しーと");
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sheet.Cell("A1").Value = "Value";
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book.Save();
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}
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}
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}
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}
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```
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