update

Common/Tools/VideoCombine.cs

@@ -0,0 +1,28 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace VideoConcat.Common.Tools
+{
+    internal class VideoCombine
+    {
+        static void GenerateCombinations(List<List<string>> videoLists, int index, List<string> currentCombination, List<List<string>> result)
+        {
+            if (index == videoLists.Count)
+            {
+                result.Add(new List<string>(currentCombination));
+                return;
+            }
+
+
+            foreach (string video in videoLists[index])
+            {
+                currentCombination.Add(video);
+                GenerateCombinations(videoLists, index + 1, currentCombination, result);
+                currentCombination.RemoveAt(currentCombination.Count - 1);
+            }
+        }
+    }
+}