Do not close workbook on merge if opened

This reverts commit 56112eae51.

RhSolutions.AddIn/AddIn/RhSolutionsAddIn.cs

@@ -4,7 +4,7 @@ namespace RhSolutions.AddIn;
 
 public sealed class RhSolutionsAddIn : IExcelAddIn
 {
-    public static readonly Application Excel = (Application)ExcelDnaUtil.Application;
+    public static Application Excel { get; private set; }
     public static ServiceProvider ServiceProvider { get; private set; }
     public static IAddInConfiguration Configuration { get; private set; }
 
@@ -14,6 +14,7 @@ public sealed class RhSolutionsAddIn : IExcelAddIn
 
         Services.AddHttpClient()
             .AddMemoryCache()
+            .AddSingleton((Application)ExcelDnaUtil.Application)
             .AddSingleton<IAddInConfiguration, AddInConfiguration>()
             .AddSingleton<IDatabaseClient, DatabaseClient>()
             .AddSingleton<ICurrencyClient, CurrencyClient>()
@@ -43,6 +44,7 @@ public sealed class RhSolutionsAddIn : IExcelAddIn
 
         ServiceProvider = Services.BuildServiceProvider();
         Configuration = ServiceProvider.GetService<IAddInConfiguration>();
+        Excel = ServiceProvider.GetService<Application>();
 
         EventsUtil.Initialize();
 

RhSolutions.AddIn/Services/ExcelReader.cs

@@ -156,6 +156,10 @@ public class ExcelReader : IReader, IDisposable
 
     public List<(string, Dictionary<Product, double>)> ReadProducts(string[] files)
     {
+        HashSet<string> openedFiles = RhSolutionsAddIn.Excel.Workbooks
+            .Cast<Workbook>()
+            .Select(wb => wb.FullName)
+            .ToHashSet();
         _progressBar = new("Открываю исходные файлы...", files.Length);
         List<Worksheet> worksheets = new();
 
@@ -170,7 +174,11 @@ public class ExcelReader : IReader, IDisposable
         var result = ReadProducts(worksheets);
         foreach (var ws in worksheets)
         {
-            ws.Parent.Close();
+            string file = (string)ws.Parent.FullName;
+            if (!openedFiles.Contains(file))
+            {
+                ws.Parent.Close(SaveChanges: false);
+            }
         }
         return result;
     }