Authority adding

SchengenVisaApi/BlazorWebAssemblyVisaApiClient/Pages/Authorities.razor

@@ -18,6 +18,8 @@
                 <NavLink href="@path">
                     <button class="btn-outline-primary">Change</button>
                 </NavLink>
+                |
+                    <button class="btn-outline-danger" @onclick="() => Delete(authority)">Delete</button>
             </td>
         </tr>
     }
@@ -25,13 +27,27 @@
 </table>
 
 @code {
-    private IEnumerable<UserModel> authorities = [];
+    private List<UserModel> authorities = [];
 
     protected override async Task OnInitializedAsync()
     {
         try
         {
-            authorities = await Client.GetAuthorityAccountsAsync();
+            authorities = (await Client.GetAuthorityAccountsAsync()).ToList();
+        }
+        catch (Exception e)
+        {
+            ErrorHandler.Handle(e);
+        }
+    }
+
+    private async Task Delete(UserModel authority)
+    {
+        try
+        {
+            await Client.RemoveAuthorityAccountAsync(authority.Id);
+            authorities.Remove(authority);
+            StateHasChanged();
         }
         catch (Exception e)
         {