Imported Upstream version 4.2.0.179

Former-commit-id: 4610231f55806d2a05ed69e5ff3faa7336cc1479

external/referencesource/System.Configuration/System/Configuration/ErrorsHelper.cs

@@ -0,0 +1,72 @@
+//------------------------------------------------------------------------------
+// <copyright file="FactoryRecord.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//------------------------------------------------------------------------------
+
+namespace System.Configuration {
+    using System.Collections;
+    using System.Collections.Specialized;
+    using System.Collections.Generic;
+
+    static internal class ErrorsHelper {
+
+        static internal int GetErrorCount(List<ConfigurationException> errors) {
+            return (errors != null) ? errors.Count : 0;
+        }
+
+        static internal bool GetHasErrors(List<ConfigurationException> errors) {
+            return GetErrorCount(errors) > 0;
+        }
+
+        static internal void AddError(ref List<ConfigurationException> errors, ConfigurationException e) {
+            Debug.Assert(e != null, "e != null");
+
+            // Create on demand
+            if (errors == null) {
+                errors = new List<ConfigurationException>();
+            }
+
+            ConfigurationErrorsException ce = e as ConfigurationErrorsException;
+            if (ce == null) {
+                errors.Add(e);
+            }
+            else {
+                ICollection<ConfigurationException> col = ce.ErrorsGeneric;
+                if (col.Count == 1) {
+                    errors.Add(e);
+                }
+                else {
+                    errors.AddRange(col);
+                }
+            }
+        }
+
+        static internal void AddErrors(ref List<ConfigurationException> errors, ICollection<ConfigurationException> coll) {
+            if (coll == null || coll.Count == 0) {
+                // Nothing to do here, bail
+                return;
+            }
+
+            foreach (ConfigurationException e in coll) {
+                AddError(ref errors, e);
+            }
+        }
+
+        static internal ConfigurationErrorsException GetErrorsException(List<ConfigurationException> errors) {
+            if (errors == null) {
+                return null;
+            }
+
+            Debug.Assert(errors.Count != 0, "errors.Count != 0");
+            return new ConfigurationErrorsException(errors);
+        }
+
+        static internal void ThrowOnErrors(List<ConfigurationException> errors) {
+            ConfigurationErrorsException e = GetErrorsException(errors);
+            if (e != null) {
+                throw e;
+            }
+        }
+    }
+}