refactor and add using constants instead of hard coded strings ...

DI/XDIHelperExtension.cs

@@ -17,6 +17,7 @@ using xFileService.Providers.Dtos;
 using xFileService.Providers.Entities;
 using xFileService.Interfaces;
 using xFileService.Providers;
+using xFileService.Constants;
 
 namespace xFileService.DI
 {
@@ -80,8 +81,8 @@ namespace xFileService.DI
             var pushHelper = new XPushServiceHelper();
 
             //
-            pushHelper.AddHub<XFileDtoHub>("fileDto");
-            pushHelper.AddHub<XFileEntityHub>("fileEntity");
+            pushHelper.AddHub<XFileDtoHub>(XFileServiceConstants.XFileDtoHub);
+            pushHelper.AddHub<XFileEntityHub>(XFileServiceConstants.XFileEntityHub);
 
             //
             app.UseXPushService(pushHelper);
@@ -106,7 +107,7 @@ namespace xFileService.DI
         /// <summary>
         /// a LogTag for Service ...
         /// </summary>
-        private static string XLogTag = "XFileService";
+        private static string XLogTag = XFileServiceConstants.XFileServiceDILogTag;
 
         /// <summary>
         /// print a log in Console ...
@@ -179,9 +180,9 @@ namespace xFileService.DI
                     //
                     descriptor = typeof(XFileServiceHelper)
                         .InvokeGenericMethod<XRepositoryDescriptor>(
-                            methodName: "GetXFileEFRepositoryDescriptor",
+                            args: null,
                             runtimeType: contextType,
-                            args: null
+                            methodName: XFileServiceConstants.GetXFileEFRepositoryDescriptor
                     );
                     break;