Add back CollectionRuleOptions custom validation

Author: sbomer

src/Tools/dotnet-monitor/CollectionRules/Options/CollectionRuleOptions.Validate.cs

@@ -0,0 +1,60 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+#nullable disable
+
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.Globalization;
+
+namespace Microsoft.Diagnostics.Tools.Monitor.CollectionRules.Options
+{
+    partial class CollectionRuleOptions : IValidatableObject
+    {
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        {
+            List<ValidationResult> results = new();
+
+            // ErrorList is populated by incorrectly using templates - this will be empty if all templates names can be resolved or if templates are not used.
+            // results.AddRange(ErrorList);
+            foreach (var error in ErrorList)
+            {
+                results.Add(new ValidationResult(error.Error, [error.MemberName]));
+            }
+
+            if (results.Count > 0)
+            {
+                return results;
+            }
+
+            // ValidationContext filtersContext = new(Filters, validationContext, validationContext.Items);
+            // filtersContext.MemberName = nameof(Filters);
+            // ValidationHelper.TryValidateItems(Filters, filtersContext, results);
+
+            // if (null != Trigger)
+            // {
+            //     ValidationContext triggerContext = new(Trigger, validationContext, validationContext.Items);
+            //     triggerContext.MemberName = nameof(Trigger);
+            //     Validator.TryValidateObject(Trigger, triggerContext, results);
+            // }
+
+            // ValidationContext actionsContext = new(Actions, validationContext, validationContext.Items);
+            // actionsContext.MemberName = nameof(Actions);
+            // ValidationHelper.TryValidateItems(Actions, actionsContext, results);
+
+            var actionNames = new HashSet<string>(StringComparer.Ordinal);
+            foreach (CollectionRuleActionOptions option in Actions)
+            {
+                if (!string.IsNullOrEmpty(option.Name) && !actionNames.Add(option.Name))
+                {
+                    results.Add(new ValidationResult(
+                        string.Format(CultureInfo.CurrentCulture, Strings.ErrorMessage_DuplicateActionName, option.Name),
+                        new[] { nameof(option.Name) }));
+                }
+            }
+
+            return results;
+        }
+    }
+}