Merge pull request #252 from Lombiq/issue/OFFI-19

OFFI-19: Adding content validation extension

Lombiq.HelpfulLibraries.OrchardCore/Validation/ContentValidateResultExtensions.cs

@@ -0,0 +1,26 @@
+using Microsoft.AspNetCore.Mvc.ModelBinding;
+using OrchardCore.ContentManagement.Handlers;
+using System.Linq;
+
+namespace Lombiq.HelpfulLibraries.OrchardCore.Validation;
+
+public static class ContentValidateResultExtensions
+{
+    public static void AddValidationErrorsToModelState(this ContentValidateResult result, ModelStateDictionary modelState)
+    {
+        foreach (var error in result.Errors)
+        {
+            if (error.MemberNames.Any())
+            {
+                foreach (var memberName in error.MemberNames)
+                {
+                    modelState.AddModelError(memberName, error.ErrorMessage);
+                }
+            }
+            else
+            {
+                modelState.AddModelError(string.Empty, error.ErrorMessage);
+            }
+        }
+    }
+}