Init

Server/Components/Pages/CreatePage.razor.cs

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+using Microsoft.AspNetCore.Components;
+using Server.Data;
+using Server.Model;
+
+namespace Server.Components.Pages
+{
+    public partial class CreatePage
+    {
+        #region Dependencies
+
+        [Inject]
+        private NavigationManager NavigationManager { get; set; } = null!;
+
+        #endregion
+
+        #region Private Properties
+
+        private string? AlertMessage { get; set; }
+        private string? InvoiceId { get; set; }
+
+        #endregion
+
+        #region Override SetParametersAsync
+
+        /// <inheritdoc />
+        public override async Task SetParametersAsync(ParameterView parameters)
+        {
+            parameters.SetParameterProperties(this);
+
+            await SettingsData.LoadAsync();
+
+            await base.SetParametersAsync(ParameterView.Empty);
+        }
+
+        #endregion
+
+        #region Private Method CreateInvoiceAsync
+
+        /// <summary>
+        ///     Asynchronously creates a new invoice if the provided InvoiceId is not null, empty,
+        ///     or whitespace, and does not already exist in the system. If the invoice is created
+        ///     successfully, navigates to the newly created invoice page.
+        /// </summary>
+        /// <returns>
+        ///     A Task representing the asynchronous operation.
+        /// </returns>
+        private async Task CreateInvoiceAsync()
+        {
+            if (string.IsNullOrWhiteSpace(InvoiceId)) return;
+            if (await InvoiceData.ExistsAsync(InvoiceId))
+            {
+                AlertMessage = "Eine Rechnung mit der Rechnungsnummer existiert bereits";
+                return;
+            }
+
+            var invoice = new InvoiceModel
+            {
+                InvoiceId = InvoiceId,
+                Comment = SettingsData.Instance.Comment,
+                PaymentData = SettingsData.Instance.PaymentData,
+                Seller = SettingsData.Instance.SellerAddress
+            };
+
+            await InvoiceData.SaveAsync(invoice);
+
+            NavigationManager.NavigateTo($"/edit/{InvoiceId}");
+        }
+
+        #endregion
+    }
+}