Throw exceptions on unknown Service or Tool

RhSolutions.AddIn/Services/ReaderFactory.cs

@@ -15,7 +15,7 @@ public class ReaderFactory
         {
             "Guess" => (IReader)_serviceProvider.GetService(typeof(GuessReader)),
             "Excel" => (IReader)_serviceProvider.GetService(typeof(ExcelReader)),
-            _ => (IReader)_serviceProvider.GetService(typeof(ExcelReader))
+            _ => throw new ArgumentException($"Незвестный интерфейс {nameof(IReader)}: {readerName}")
         };
     }
 }

RhSolutions.AddIn/Services/WriterFactory.cs

@@ -15,7 +15,7 @@ public class WriterFactory
         {
             "Excel" => (IWriter)_serviceProvider.GetService(typeof(ExcelWriter)),
             "Dxf" => (IWriter)_serviceProvider.GetService(typeof(DxfWriter)),
-            _ => (IWriter)_serviceProvider.GetService(typeof(ExcelWriter))
+            _ => throw new ArgumentException($"Незвестный интерфейс {nameof(IWriter)}: {writerName}")
         };
     }
 }

RhSolutions.AddIn/Tools/ToolFactory.cs

@@ -11,7 +11,7 @@ internal class ToolFactory
             "merge" => new MergeTool(RhSolutionsAddIn.ServiceProvider),
             "dxfexport" => new DxfTool(RhSolutionsAddIn.ServiceProvider),
             "Guessexport" => new GuessTool(RhSolutionsAddIn.ServiceProvider),            
-            _ => throw new Exception("Неизвестный инструмент"),
+            _ => throw new Exception($"Неизвестный инструмент {toolName}"),
         };
         return tool;
     }