Implemented a new method AddValidationResult in FluentValidationVal…

samples/BlazorServer/Pages/Index.razor

@@ -68,6 +68,7 @@
 </EditForm>
 <br />
 <button @onclick="PartialValidate">Partial Validation</button>
+<button @onclick="AddValidationResult">Add Validation Result</button>
 
 @code {
     private readonly Person _person = new();
@@ -78,4 +79,14 @@
 
     private void PartialValidate() 
         => Console.WriteLine($"Partial validation result : {_fluentValidationValidator?.Validate(options => options.IncludeRuleSets("Names"))}");
+
+    private void AddValidationResult()
+    {
+        _fluentValidationValidator!.AddValidationResult(_person, new FluentValidation.Results.ValidationResult
+            {
+                Errors = new List<FluentValidation.Results.ValidationFailure> {
+                    new FluentValidation.Results.ValidationFailure { PropertyName = "EmailAddress", ErrorMessage = "This email address is taken already"}
+                }
+            });
+    }
 }

samples/BlazorWebAssembly/Pages/Index.razor

@@ -68,6 +68,7 @@
 </EditForm>
 <br />
 <button @onclick="PartialValidate">Partial Validation</button>
+<button @onclick="AddValidationResult">Add Validation Result</button>
 
 @code {
     private readonly Person _person = new();
@@ -83,4 +84,14 @@
 
     private void PartialValidate()
         => Console.WriteLine($"Partial validation result : {_fluentValidationValidator?.Validate(options => options.IncludeRuleSets("Names"))}");
+
+    private void AddValidationResult()
+    {
+        _fluentValidationValidator!.AddValidationResult(_person, new FluentValidation.Results.ValidationResult
+            {
+                Errors = new List<FluentValidation.Results.ValidationFailure> {
+                    new FluentValidation.Results.ValidationFailure { PropertyName = "EmailAddress", ErrorMessage = "This email address is taken already"}
+                }
+            });
+    }
 }

src/Blazored.FluentValidation/EditContextFluentValidationExtensions.cs

@@ -17,17 +17,14 @@ public static void AddFluentValidation(this EditContext editContext, IServicePro
     {
         ArgumentNullException.ThrowIfNull(editContext, nameof(editContext));
 
-        var messages = new ValidationMessageStore(editContext);
-
         editContext.OnValidationRequested +=
-            async (sender, _) => await ValidateModel((EditContext)sender!, messages, serviceProvider, disableAssemblyScanning, fluentValidationValidator, validator);
+            async (sender, _) => await ValidateModel((EditContext)sender!, serviceProvider, disableAssemblyScanning, fluentValidationValidator, validator);
 
         editContext.OnFieldChanged +=
-            async (_, eventArgs) => await ValidateField(editContext, messages, eventArgs.FieldIdentifier, serviceProvider, disableAssemblyScanning, validator);
+            async (_, eventArgs) => await ValidateField(editContext, fluentValidationValidator.Messages, eventArgs.FieldIdentifier, serviceProvider, disableAssemblyScanning, validator);
     }
 
     private static async Task ValidateModel(EditContext editContext,
-        ValidationMessageStore messages,
         IServiceProvider serviceProvider,
         bool disableAssemblyScanning,
         FluentValidationValidator fluentValidationValidator,
@@ -56,11 +53,11 @@ private static async Task ValidateModel(EditContext editContext,
             editContext.Properties[PendingAsyncValidation] = asyncValidationTask;
             var validationResults = await asyncValidationTask;
 
-            messages.Clear();
+            fluentValidationValidator.Messages.Clear();
             foreach (var validationResult in validationResults.Errors)
             {
                 var fieldIdentifier = ToFieldIdentifier(editContext, validationResult.PropertyName);
-                messages.Add(fieldIdentifier, validationResult.ErrorMessage);
+                fluentValidationValidator.Messages.Add(fieldIdentifier, validationResult.ErrorMessage);
             }
 
             editContext.NotifyValidationStateChanged();

src/Blazored.FluentValidation/FluentValidationsValidator.cs

@@ -18,6 +18,8 @@ public class FluentValidationValidator : ComponentBase
     [Parameter] public Action<ValidationStrategy<object>>? Options { get; set; }
     internal Action<ValidationStrategy<object>>? ValidateOptions { get; set; }
 
+    internal ValidationMessageStore Messages { get; private set; }
+
     public bool Validate(Action<ValidationStrategy<object>>? options = null)
     {
         if (CurrentEditContext is null)
@@ -79,6 +81,30 @@ protected override void OnInitialized()
                                                 $"inside an {nameof(EditForm)}.");
         }
 
+        Messages = new ValidationMessageStore(CurrentEditContext);
         CurrentEditContext.AddFluentValidation(ServiceProvider, DisableAssemblyScanning, Validator, this);
     }
+
+    /// <summary>
+    /// Adds the validation errors contained in a FluentValidation ValidationResult object to the 
+    /// current EditContext's validation messages. This allows for manual validation scenarios where 
+    /// the ValidationResult may not be automatically integrated into Blazor's validation system.
+    /// Calling this method will update the validation state and the associated UI elements.
+    /// </summary>
+    /// <param name="model">The object instance that the validation applies to. This is used to
+    /// identify the form model within the EditContext.</param>
+    /// <param name="validationResult">The ValidationResult obtained from FluentValidation that contains
+    /// the details of any validation errors.</param>
+    public void AddValidationResult(object model, ValidationResult validationResult)
+    {
+        if (CurrentEditContext != null && Messages != null)
+        {
+            foreach (ValidationFailure error in validationResult.Errors)
+            {
+                var fieldIdentifier = new FieldIdentifier(model, error.PropertyName);
+                Messages.Add(fieldIdentifier, error.ErrorMessage);
+            }
+            CurrentEditContext.NotifyValidationStateChanged();
+        }
+    }
 }