回答編集履歴
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追記
test
CHANGED
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@@ -9,3 +9,157 @@
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変更は [Dictionary<TKey,TValue> Class](https://docs.microsoft.com/ja-jp/dotnet/api/system.collections.generic.dictionary-2?view=netframework-4.7.2) を使うと良いでしょう。まずは片方のリストを、ファイル名をキーに辞書に入れ、次のリストに含まれる項目の一つ一つに対してその辞書に同じファイル名の項目が入っているかどうかを調べます。入っていた場合にはその二つの項目を比較し、更新日時が違えば変更されたことがわかります。
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# 追記
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こんな感じになります。
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```C#
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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namespace Etude
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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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string fileMask = "*.txt";
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foreach (var file in Directory.GetFiles(".", fileMask))
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{
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File.Delete(file);
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}
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File.Create("a.txt").Close();
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File.Create("b.txt").Close();
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File.Create("c.txt").Close();
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var dir = new DirectoryInfo(".");
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var before = dir
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.GetFiles(fileMask)
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.ToDictionary(a => a.FullName);
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Dump(nameof(before), before.Keys);
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File.Create("d.txt").Close();
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File.Delete("b.txt");
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File.Delete("c.txt");
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File.Create("c.txt").Close();
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var after = dir
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.GetFiles(fileMask)
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.ToDictionary(a => a.FullName);
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Dump(nameof(after), after.Keys);
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var added = after
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.Keys
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.Except(before.Keys)
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.Select(a => after[a])
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.ToArray();
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Dump(nameof(added), added.Select(a => a.FullName));
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var removed = before
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.Keys
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.Except(after.Keys)
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.Select(a => before[a])
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.ToArray();
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Dump(nameof(removed), removed.Select(a => a.FullName));
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var changed = before
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.Keys
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.Where(a => after.ContainsKey(a))
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.Where(a => after[a].LastWriteTime != before[a].LastWriteTime)
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.ToArray();
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Dump(nameof(changed), changed);
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Console.ReadKey();
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}
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static void Dump(string title, IEnumerable<string> files)
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{
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Console.WriteLine($"[{title}]");
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foreach (var file in files)
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{
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Console.WriteLine(file);
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}
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Console.WriteLine();
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}
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}
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}
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```
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