edihasaj · January 9, 2022 19:30 · Jan 9, 2022
diff --git a/CompositeValidationResult.cs b/CompositeValidationResult.cs
@@ -0,0 +1,24 @@
+public class CompositeValidationResult : ValidationResult
+{
+    private readonly List<ValidationResult> _results = new();
+
+    public CompositeValidationResult(string errorMessage) : base(errorMessage)
+    {
+    }
+
+    public CompositeValidationResult(string errorMessage, IEnumerable<string> memberNames) : base(errorMessage,
+        memberNames)
+    {
+    }
+
+    protected CompositeValidationResult(ValidationResult validationResult) : base(validationResult)
+    {
+    }
+
+    public IEnumerable<ValidationResult> Results => _results;
+
+    public void AddResult(ValidationResult validationResult)
+    {
+        _results.Add(validationResult);
+    }
+}
diff --git a/ValidateObjectAttribute.cs b/ValidateObjectAttribute.cs
@@ -0,0 +1,31 @@
+public class ValidateObjectAttribute : ValidationAttribute
+{
+    protected override ValidationResult IsValid(object value, ValidationContext validationContext)
+    {
+        if (value == null) return ValidationResult.Success;
+        var results = new List<ValidationResult>();
+
+        if (value is not IEnumerable<object> list)
+        {
+            var context = new ValidationContext(value, null, null);
+            Validator.TryValidateObject(value, context, results, true);
+        }
+        else
+        {
+            foreach (var o in list)
+            {
+                var context = new ValidationContext(o, null, null);
+                Validator.TryValidateObject(o, context, results, true);
+            }
+        }
+
+        if (results.Count == 0) return ValidationResult.Success;
+
+        var compositeResults =
+            new CompositeValidationResult(
+                $"{validationContext.DisplayName} {string.Join("; ", results.Select(r => r.ErrorMessage))}");
+        results.ForEach(compositeResults.AddResult);
+
+        return compositeResults;
+    }
+}