Consolidate Edit and Add server pages into single routable component.

ServerManagement/Components/Controls/ServerComponent.razor

@@ -44,7 +44,7 @@
         </button>
       }
       &nbsp;
-      <a href="@($"/servers/{Server.Id}")" class="btn btn-primary">Edit</a>
+      <a href="@($"/server/{Server.Id}")" class="btn btn-primary">Edit</a>
     </td>
     <td>
       <EditForm

ServerManagement/Components/Pages/AddEditServer.razor

@@ -1,9 +1,4 @@
-@page "/servers/{id:int}"
-@* Route constraints: https://learn.microsoft.com/en-us/aspnet/core/fundamentals/routing?view=aspnetcore-9.0#route-constraints *@
-
-@* Note that this attribute now needs to be removed, because Routing is globally interactive.
-The navigation manager only will respond correctly if all its behaviours are the same. *@
-@* @attribute [ExcludeFromInteractiveRouting] *@
+@page "/server/{id:int?}"
 
 @inject NavigationManager NavigationManager
 @inject IJSRuntime JSRuntime
@@ -11,18 +6,27 @@ The navigation manager only will respond correctly if all its behaviours are the
 <NavigationLock
   OnBeforeInternalNavigation="OnBeforeInternalNavigation"
   ConfirmExternalNavigation="true">
-  </NavigationLock>
+</NavigationLock>
 
-<h3>Edit server</h3>
-<br/>
-<br/>
+@if (Id.HasValue)
+{
+  <h3>Edit server</h3>
+}
+else
+{
+  <h3>Add server</h3>
+}
 
 @if (server != null)
 {
   <EditForm Model="server" FormName="formServer" OnValidSubmit="SubmitServer">
     <DataAnnotationsValidator></DataAnnotationsValidator>
     <ValidationSummary></ValidationSummary>
-    <InputNumber @bind-Value="server.Id" hidden></InputNumber>
+
+    @if (server.Id > 0)
+    {
+      <InputNumber @bind-Value="server.Id" hidden></InputNumber>
+    }
 
     <FieldComponent Label="Name">
       <Control>
@@ -48,29 +52,50 @@ The navigation manager only will respond correctly if all its behaviours are the
       </Control>
     </FieldComponent>
     <br/>
-    <button class="btn btn-primary" type="submit">Update</button>
+    @if (server.Id > 0)
+    {
+      <button class="btn btn-primary" type="submit">Update</button>
+    }
+    else 
+    {
+      <button class="btn btn-primary" type="submit">Save</button>
+    }
     &nbsp;
     <a href="/servers" class="btn btn-primary">Close</a>
   </EditForm>
 }
 
 @code {
-  [Parameter] // This is a root parameter.
-  public int Id { get; set; }
+  [Parameter]
+  public int? Id { get; set; }
 
-  [SupplyParameterFromForm(FormName = "formServer")]
+  [SupplyParameterFromForm]
   private Server? server { get; set; }
 
   protected override void OnParametersSet()
   {
-    server ??= ServersRepository.GetServerById(this.Id);
+    if (this.Id.HasValue)
+    {
+      server ??= ServersRepository.GetServerById(this.Id.Value);
+    }
+    else
+    {
+      server ??= new Server() { IsOnline = false };
+    }
   }
 
   private void SubmitServer()
   {
     if (server != null)
     {
-      ServersRepository.UpdateServer(server.Id, server);
+      if (this.Id.HasValue)
+      {
+        ServersRepository.UpdateServer(server.Id, server);
+      }
+      else
+      {
+        ServersRepository.AddServer(server);
+      }
     }
 
     // An exception is raised when debugging from VS Code, but not when using dotnet watch.

ServerManagement/Components/Pages/AddServer.razor

@@ -1,59 +0,0 @@
-@page "/servers/add"
-@using System.ComponentModel.DataAnnotations
-
-@attribute [ExcludeFromInteractiveRouting]
-
-@inject NavigationManager NavigationManager
-
-<h3>Add server</h3>
-<br/>
-<br/>
-<EditForm Model="server" FormName="formServer" OnValidSubmit="SubmitServer">
-  <DataAnnotationsValidator></DataAnnotationsValidator>
-  <ValidationSummary></ValidationSummary>
-
-  <div class="row mb-3">
-    <div class="col-2">
-      <label class="col-form-label">Name</label>
-    </div>
-    <div class="col-6">
-      <InputText @bind-Value="server.Name" class="form-control"></InputText>
-    </div>
-    <div class="col">
-      <ValidationMessage For="() => server.Name"></ValidationMessage>
-    </div>
-  </div>
-
-  <div class="row mb-3">
-    <div class="col-2">
-      <label class="col-form-label">City</label>
-    </div>
-    <div class="col-6">
-      <InputText @bind-Value="server.City" class="form-control"></InputText>
-    </div>
-    <div class="col">
-      <ValidationMessage For="() => server.City"></ValidationMessage>
-    </div>
-  </div>
-  <br/>
-  <button class="btn btn-primary" type="submit">Add</button>
-  &nbsp;
-  <a href="/servers" class="btn btn-primary">Close</a>
-</EditForm>
-
-
-@code {
-  [SupplyParameterFromForm(FormName = "formServer")]
-  private Server server { get; set; } = new Server() { IsOnline = false };
-
-  private void SubmitServer()
-  {
-    if (server != null)
-    {
-      ServersRepository.AddServer(server);
-    }
-
-    // An exception is raised when debugging from VS Code, but not when using dotnet watch.
-    NavigationManager.NavigateTo($"/servers/back_from/{this.server?.City}");
-  }
-}

ServerManagement/Components/Pages/Servers.razor

@@ -18,7 +18,7 @@
   style="width: 600px">
 </SearchBarComponent>
 <br/>
-<a href="@($"/servers/add")" class="btn btn-primary">Add</a>
+<a href="@($"/server")" class="btn btn-primary">Add</a>
 <br/>
 
 <CascadingValue Name="SelectedCity" Value="@selectedCity">