–Upgrade to .NET 11

Elwig/Helpers/Billing/BillingData.cs

@@ -251,23 +251,23 @@ namespace Elwig.Helpers.Billing {
 
             try {
                 return new JsonObject() {
-                    ["15kmw"] = Math.Round(y.Distinct().Single(), prec)
+                    ["15kmw"] = Math.Round((decimal)y.Distinct().Single(), prec)
                 };
             } catch { }
 
             var data = new JsonObject();
             if (y[0] != y[1]) {
-                data[$"{x[0]}{mode}"] = Math.Round(y[0], prec);
+                data[$"{x[0]}{mode}"] = Math.Round((decimal)y[0], prec);
             }
             for (int i = 1; i < x.Length - 1; i++) {
-                var d1 = Math.Round(y[i] - y[i - 1], prec);
-                var d2 = Math.Round(y[i + 1] - y[i], prec);
+                var d1 = Math.Round((decimal)(y[i] - y[i - 1]), prec);
+                var d2 = Math.Round((decimal)(y[i + 1] - y[i]), prec);
                 if (d1 != d2) {
-                    data[$"{x[i]}{mode}"] = Math.Round(y[i], prec);
+                    data[$"{x[i]}{mode}"] = Math.Round((decimal)y[i], prec);
                 }
             }
             if (y[^1] != y[^2]) {
-                data[$"{x[^1]}{mode}"] = Math.Round(y[^1], prec);
+                data[$"{x[^1]}{mode}"] = Math.Round((decimal)y[^1], prec);
             }
             return data;
         }
@@ -275,7 +275,7 @@ namespace Elwig.Helpers.Billing {
         protected static JsonNode GraphEntryToJson(GraphEntry entry) {
             try {
                 if (entry.ContractedFlatBonus == null) {
-                    return JsonValue.Create((decimal)entry.DataGraph.DataY.Distinct().Single());
+                    return JsonValue.Create(Math.Round((decimal)entry.DataGraph.DataY.Distinct().Single(), entry.DataGraph.Precision));
                 }
             } catch { }
 
@@ -287,7 +287,7 @@ namespace Elwig.Helpers.Billing {
             curve["data"] = GraphToJson(entry.DataGraph, entry.Mode.ToString().ToLower());
 
             if (entry.ContractedFlatBonus != null) {
-                curve["ctrd"] = (decimal)entry.ContractedFlatBonus;
+                curve["ctrd"] = Math.Round((decimal)entry.ContractedFlatBonus, entry.ContractedGraph?.Precision ?? entry.DataGraph.Precision);
             } else if (entry.ContractedGraph != null) {
                 curve["ctrd"] = GraphToJson(entry.ContractedGraph, entry.Mode.ToString().ToLower());
             }

Elwig/Helpers/Utils.cs

@@ -579,7 +579,7 @@ namespace Elwig.Helpers {
                         body.Add(doc.AsEmailAttachment($"{name}.pdf"));
                     }
                     msg.Body = body;
-                    await client!.SendAsync(msg);
+                    await client!.SendAsync(new SmtpSendRequest(msg));
                     await AddSentMails([(
                         "email", member.MgNr, member.AdministrativeName,
                         member.EmailAddresses.OrderBy(a => a.Nr).Select(a => a.Address).ToArray(),