更新

ShrlAlgoToolkit.Core/Assists/IOAssist.cs

@@ -11,7 +11,35 @@ public static class IOAssist
         var files = Directory.GetFiles($"{path}", "*", SearchOption.AllDirectories); //遍历所有文件夹
         var list = files.Union(files).OrderBy(s => s);
     }
+    /// <summary>
+    /// 获取当前文件的副本或备份文件名
+    /// </summary>
+    /// <param name="filePath"></param>
+    /// <returns></returns>
+    /// <exception cref="FileNotFoundException"></exception>
+    public static string GetUniqueFilePath(string filePath)
+    {
+        if (string.IsNullOrEmpty(filePath) || !File.Exists(filePath))
+        {
+            throw new FileNotFoundException($"文件'{filePath}'不存在。");
+        }
+        var dir = Path.GetDirectoryName(filePath);
+        var extension = Path.GetExtension(filePath);
+        var fileNameWithoutExtension = Path.GetFileNameWithoutExtension(filePath);
+        var counter = 1;
 
+        while (true)
+        {
+            var candidateFileName = $"{fileNameWithoutExtension}.{counter:D3}{extension}";
+            var fullPath = Path.Combine(dir, candidateFileName);
+            if (!File.Exists(fullPath))
+            {
+                return fullPath;
+            }
+
+            counter++;
+        }
+    }
     public static string GetRelativePath(string fromPath, string toPath)
     {
         Uri uri = new(fromPath);