remove bounced contacts

Gremlin_BlazorServer/Pages/Contacts.razor

@@ -146,6 +146,7 @@
 
             <Paragraph>
                 <Button Color="Color.Primary" Clicked="@OnRemoveDublicates">Remove Dublicates</Button>
+                <Button Color="Color.Secondary" Clicked="@OnRemoveBounced">Remove Bounced</Button>
             </Paragraph>
             
             <Heading Size="HeadingSize.Is6">Import Contacts from CSV</Heading>

Gremlin_BlazorServer/Pages/Contacts.razor.cs

@@ -92,6 +92,17 @@ public partial class Contacts {
     
     private static async Task OnRemoveDublicates() {
         int i = await GenericController.RemoveDublicatesAsync<Contact>();
-        Console.WriteLine($"Removed {i} dublicates from Contacts.");
+        Console.WriteLine(i > 0 ? $"Removed {i} dublicates from Contacts." : "No dublicated contacts found.");
+    }
+
+    private static async Task OnRemoveBounced() {
+        IList<Contact>? bouncedContacts = await GenericController.GetAllAsync<Contact>(c => c.EMail.Contains("bounced") || c.EmailBounced);
+        if (bouncedContacts is not null && bouncedContacts.Count > 0) {
+            int i = await GenericController.RemoveAsync(bouncedContacts);
+            Console.WriteLine($"Removed {i} bounced contacts.");
+        }
+        else {
+            Console.WriteLine("Found no bounced contacts.");
+        }
     }
 }

Gremlin_BlazorServer/Services/GenericController.cs

@@ -206,6 +206,17 @@ public class GenericController {
             return 0;
         }
     }
+    
+    public static async Task<int> RemoveAsync<T>(IList<T> entities) where T : class, IMetadata {
+        try {
+            await Task.Run(() => gremlinDb.Set<T>().RemoveRange(entities));
+            return await gremlinDb.SaveChangesAsync();
+        }
+        catch (Exception exception) {
+            Console.WriteLine(exception.InnerException);
+            return 0;
+        }
+    }
 
     private static void HandleConcurrencyExceptions(DbUpdateException ex) {
         Console.WriteLine($"!!! HandleConcurrencyException: {ex.Message}");
@@ -231,7 +242,6 @@ public class GenericController {
             }
     }
 
-
     public static async Task<int> RemoveDublicatesAsync<T>() where T : class, IMetadata {
         try {
             List<T> entities = gremlinDb.Set<T>().AsEnumerable().GroupBy(e => new { e.HashCode}).SelectMany(grp => grp.Skip(1)).ToList();