diff --git a/.nuget/nuget.exe b/.nuget/nuget.exe
new file mode 100644
index 0000000000..5e246fb40d
Binary files /dev/null and b/.nuget/nuget.exe differ
diff --git a/Source/Csla/DataPortalOperationAttributes.cs b/Source/Csla/DataPortalOperationAttributes.cs
index 945d49e6d7..709bcb7bc0 100644
--- a/Source/Csla/DataPortalOperationAttributes.cs
+++ b/Source/Csla/DataPortalOperationAttributes.cs
@@ -23,6 +23,13 @@ public class InjectAttribute : Attribute
     /// service is not registered.
     /// </summary>
     public bool AllowNull { get; set; }
+
+    /// <summary>
+    /// Gets or sets the key used to identify a keyed service registration.
+    /// When specified, the service is retrieved using GetKeyedService or GetRequiredKeyedService.
+    /// Requires .NET 8.0 or higher.
+    /// </summary>
+    public object? Key { get; set; }
   }
 
   /// <summary>
diff --git a/Source/Csla/Reflection/ServiceProviderMethodCaller.cs b/Source/Csla/Reflection/ServiceProviderMethodCaller.cs
index d24d5b16de..1acc85d9be 100644
--- a/Source/Csla/Reflection/ServiceProviderMethodCaller.cs
+++ b/Source/Csla/Reflection/ServiceProviderMethodCaller.cs
@@ -553,11 +553,40 @@ private static ParameterInfo[] GetDIParameters(System.Reflection.MethodInfo meth
             {
               throw new NullReferenceException(nameof(service));
             }
-            // Use GetService for optional (allows null) or GetRequiredService for required (throws if not registered)
-            plist[index] = method.AllowNull[index]
-              ? service.GetService(item.ParameterType)
-              : service.GetRequiredService(item.ParameterType);
-
+            
+            var serviceKey = method.ServiceKeys[index];
+            if (serviceKey != null)
+            {
+#if NET8_0_OR_GREATER
+              // Use keyed service injection for .NET 8+
+              if (method.AllowNull[index])
+              {
+                // For optional keyed services, cast to IKeyedServiceProvider
+                if (service is IKeyedServiceProvider keyedProvider)
+                {
+                  plist[index] = keyedProvider.GetKeyedService(item.ParameterType, serviceKey);
+                }
+                else
+                {
+                  throw new InvalidOperationException("Service provider must implement IKeyedServiceProvider to support keyed services.");
+                }
+              }
+              else
+              {
+                // For required keyed services, use extension method
+                plist[index] = service.GetRequiredKeyedService(item.ParameterType, serviceKey);
+              }
+#else
+              throw new NotSupportedException("Keyed service injection is only supported on .NET 8.0 or higher.");
+#endif
+            }
+            else
+            {
+              // Use GetService for optional (allows null) or GetRequiredService for required (throws if not registered)
+              plist[index] = method.AllowNull[index]
+                ? service.GetService(item.ParameterType)
+                : service.GetRequiredService(item.ParameterType);
+            }
           }
           else
           {
diff --git a/Source/Csla/Reflection/ServiceProviderMethodInfo.cs b/Source/Csla/Reflection/ServiceProviderMethodInfo.cs
index f59bfe3863..5595201d38 100644
--- a/Source/Csla/Reflection/ServiceProviderMethodInfo.cs
+++ b/Source/Csla/Reflection/ServiceProviderMethodInfo.cs
@@ -22,7 +22,7 @@ namespace Csla.Reflection
   /// </summary>
   public class ServiceProviderMethodInfo
   {
-    [MemberNotNullWhen(true, nameof(DynamicMethod), nameof(Parameters), nameof(IsInjected), nameof(AllowNull), nameof(DataPortalMethodInfo))]
+    [MemberNotNullWhen(true, nameof(DynamicMethod), nameof(Parameters), nameof(IsInjected), nameof(AllowNull), nameof(ServiceKeys), nameof(DataPortalMethodInfo))]
     private bool Initialized { get; set; }
 
     /// <summary>
@@ -55,6 +55,11 @@ public class ServiceProviderMethodInfo
     /// </summary>
     public bool[]? AllowNull { get; private set; }
     /// <summary>
+    /// Gets an array of keys for injected parameters.
+    /// Null entries indicate non-keyed services.
+    /// </summary>
+    public object?[]? ServiceKeys { get; private set; }
+    /// <summary>
     /// Gets a value indicating whether the method
     /// returns type Task
     /// </summary>
@@ -83,7 +88,7 @@ public ServiceProviderMethodInfo(System.Reflection.MethodInfo methodInfo)
     /// Initializes and caches the metastate values
     /// necessary to invoke the method
     /// </summary>
-    [MemberNotNull(nameof(DynamicMethod), nameof(Parameters), nameof(IsInjected), nameof(AllowNull), nameof(DataPortalMethodInfo))]
+    [MemberNotNull(nameof(DynamicMethod), nameof(Parameters), nameof(IsInjected), nameof(AllowNull), nameof(ServiceKeys), nameof(DataPortalMethodInfo))]
     public void PrepForInvocation()
     {
       if (!Initialized)
@@ -97,6 +102,7 @@ public void PrepForInvocation()
             TakesParamArray = (Parameters.Length == 1 && Parameters[0].ParameterType.Equals(typeof(object[])));
             IsInjected = new bool[Parameters.Length];
             AllowNull = new bool[Parameters.Length];
+            ServiceKeys = new object?[Parameters.Length];
 
             int index = 0;
             foreach (var item in Parameters)
@@ -106,6 +112,7 @@ public void PrepForInvocation()
               {
                 IsInjected[index] = true;
                 AllowNull[index] = injectAttribute.AllowNull || ParameterAllowsNull(item);
+                ServiceKeys[index] = injectAttribute.Key;
               }
               index++;
             }
diff --git a/Source/tests/csla.netcore.test/DataPortal/ServiceProviderMethodCallerTests.cs b/Source/tests/csla.netcore.test/DataPortal/ServiceProviderMethodCallerTests.cs
index 49096e3d81..e006e6690b 100644
--- a/Source/tests/csla.netcore.test/DataPortal/ServiceProviderMethodCallerTests.cs
+++ b/Source/tests/csla.netcore.test/DataPortal/ServiceProviderMethodCallerTests.cs
@@ -504,6 +504,92 @@ public async Task InvokeMethodWithRequiredServiceInjection_ThrowsWhenServiceNotR
       await FluentActions.Invoking(async () => await portal.CreateAsync())
         .Should().ThrowAsync<Exception>();
     }
+
+#if NET8_0_OR_GREATER
+    [TestMethod]
+    public void FindMethodWithKeyedServiceInjection()
+    {
+      var obj = new KeyedServiceInjection();
+      var method = _systemUnderTest.FindDataPortalMethod<CreateAttribute>(obj, null);
+
+      method.Should().NotBeNull();
+      method.PrepForInvocation();
+      method.Parameters.Should().HaveCount(1);
+      method.IsInjected.Should().HaveCount(1);
+      method.IsInjected![0].Should().BeTrue();
+      method.ServiceKeys.Should().HaveCount(1);
+      method.ServiceKeys![0].Should().Be("serviceA");
+    }
+
+    [TestMethod]
+    public async Task InvokeMethodWithKeyedServiceInjection()
+    {
+      var contextWithService = TestDIContextFactory.CreateDefaultContext(services =>
+      {
+        services.AddKeyedTransient<IOptionalService, ServiceAImplementation>("serviceA");
+      });
+
+      var portal = contextWithService.CreateDataPortal<KeyedServiceInjection>();
+      var obj = await portal.CreateAsync();
+
+      obj.Should().NotBeNull();
+      obj.Data.Should().Be("Service A data");
+    }
+
+    [TestMethod]
+    public void FindMethodWithKeyedServiceAndCriteriaInjection()
+    {
+      var obj = new KeyedServiceWithCriteriaInjection();
+      var method = _systemUnderTest.FindDataPortalMethod<CreateAttribute>(obj, [123]);
+
+      method.Should().NotBeNull();
+      method.PrepForInvocation();
+      method.Parameters.Should().HaveCount(2);
+      method.IsInjected.Should().HaveCount(2);
+      method.IsInjected![0].Should().BeFalse(); // First param is criteria
+      method.IsInjected![1].Should().BeTrue();  // Second param is injected
+      method.ServiceKeys.Should().HaveCount(2);
+      method.ServiceKeys![0].Should().BeNull(); // First param is not injected
+      method.ServiceKeys![1].Should().Be("serviceB");
+    }
+
+    [TestMethod]
+    public async Task InvokeMethodWithKeyedServiceAndCriteriaInjection()
+    {
+      var contextWithService = TestDIContextFactory.CreateDefaultContext(services =>
+      {
+        services.AddKeyedTransient<IOptionalService, ServiceBImplementation>("serviceB");
+      });
+
+      var portal = contextWithService.CreateDataPortal<KeyedServiceWithCriteriaInjection>();
+      var obj = await portal.CreateAsync(42);
+
+      obj.Should().NotBeNull();
+      obj.Id.Should().Be(42);
+      obj.Data.Should().Be("Service B data");
+    }
+
+    [TestMethod]
+    public async Task InvokeMethodWithOptionalKeyedServiceInjection_ServiceNotRegistered()
+    {
+      var portal = _diContext.CreateDataPortal<OptionalKeyedServiceInjection>();
+      var obj = await portal.CreateAsync();
+
+      obj.Should().NotBeNull();
+      obj.Data.Should().Be("Keyed service is null as expected");
+    }
+
+    [TestMethod]
+    public async Task InvokeMethodWithKeyedServiceInjection_ThrowsWhenServiceNotRegistered()
+    {
+      var portal = _diContext.CreateDataPortal<KeyedServiceInjection>();
+      
+      // This should throw because the keyed service is required but not registered
+      // The exception will be wrapped in DataPortalException
+      await FluentActions.Invoking(async () => await portal.CreateAsync())
+        .Should().ThrowAsync<Exception>();
+    }
+#endif
   }
 
   #region Classes for testing various scenarios of loading/finding data portal methods
@@ -920,5 +1006,83 @@ private void Create([Inject] IOptionalService requiredService)
     }
   }
 
+#if NET8_0_OR_GREATER
+  // Tests for keyed service injection (NET8+ only)
+  public class KeyedServiceInjection : BusinessBase<KeyedServiceInjection>
+  {
+    public static readonly PropertyInfo<string> DataProperty = RegisterProperty<string>(nameof(Data));
+    public string Data
+    {
+      get => GetProperty(DataProperty);
+      set => SetProperty(DataProperty, value);
+    }
+
+    [Create]
+    private void Create([Inject(Key = "serviceA")] IOptionalService keyedService)
+    {
+      using (BypassPropertyChecks)
+      {
+        Data = keyedService.GetData();
+      }
+    }
+  }
+
+  public class KeyedServiceWithCriteriaInjection : BusinessBase<KeyedServiceWithCriteriaInjection>
+  {
+    public static readonly PropertyInfo<string> DataProperty = RegisterProperty<string>(nameof(Data));
+    public string Data
+    {
+      get => GetProperty(DataProperty);
+      set => SetProperty(DataProperty, value);
+    }
+
+    public static readonly PropertyInfo<int> IdProperty = RegisterProperty<int>(nameof(Id));
+    public int Id
+    {
+      get => GetProperty(IdProperty);
+      set => SetProperty(IdProperty, value);
+    }
+
+    [Create]
+    private void Create(int id, [Inject(Key = "serviceB")] IOptionalService keyedService)
+    {
+      using (BypassPropertyChecks)
+      {
+        Id = id;
+        Data = keyedService.GetData();
+      }
+    }
+  }
+
+  public class OptionalKeyedServiceInjection : BusinessBase<OptionalKeyedServiceInjection>
+  {
+    public static readonly PropertyInfo<string> DataProperty = RegisterProperty<string>(nameof(Data));
+    public string Data
+    {
+      get => GetProperty(DataProperty);
+      set => SetProperty(DataProperty, value);
+    }
+
+    [Create]
+    private void Create([Inject(Key = "nonExistent", AllowNull = true)] IOptionalService? keyedService)
+    {
+      using (BypassPropertyChecks)
+      {
+        Data = keyedService == null ? "Keyed service is null as expected" : keyedService.GetData();
+      }
+    }
+  }
+
+  public class ServiceAImplementation : IOptionalService
+  {
+    public string GetData() => "Service A data";
+  }
+
+  public class ServiceBImplementation : IOptionalService
+  {
+    public string GetData() => "Service B data";
+  }
+#endif
+
   #endregion
 }
\ No newline at end of file