Added SinaglR

Server/Pages/Error.cshtml.cs

@@ -0,0 +1,23 @@
+using System.Diagnostics;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc.RazorPages;
+
+namespace Barcode.Host.Server.Pages;
+
+[ResponseCache(Duration = 0, Location = ResponseCacheLocation.None, NoStore = true)]
+[IgnoreAntiforgeryToken]
+public class ErrorModel : PageModel
+{
+    public string? RequestId { get; set; }
+
+    public bool ShowRequestId => !string.IsNullOrEmpty(RequestId);
+
+    private readonly ILogger<ErrorModel> _Logger;
+
+    public ErrorModel(ILogger<ErrorModel> logger) =>
+        _Logger = logger;
+
+    public void OnGet() =>
+        RequestId = Activity.Current?.Id ?? HttpContext.TraceIdentifier;
+}
+