Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Web/UI/WebParts/WebPartDescriptionCollection.cs

@@ -0,0 +1,72 @@
+//------------------------------------------------------------------------------
+// <copyright file="WebPartDescriptionCollection.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//------------------------------------------------------------------------------
+
+namespace System.Web.UI.WebControls.WebParts {
+
+    using System;
+    using System.Collections;
+    using System.Collections.Specialized;
+    using System.ComponentModel;
+    using System.Globalization;
+
+    public sealed class WebPartDescriptionCollection : ReadOnlyCollectionBase {
+
+        private HybridDictionary _ids;
+
+        public WebPartDescriptionCollection() {
+        }
+
+        public WebPartDescriptionCollection(ICollection webPartDescriptions) {
+            if (webPartDescriptions == null) {
+                throw new ArgumentNullException("webPartDescriptions");
+            }
+
+            _ids = new HybridDictionary(webPartDescriptions.Count, true /* caseInsensitive */);
+            foreach (object obj in webPartDescriptions) {
+                if (obj == null) {
+                    throw new ArgumentException(SR.GetString(SR.Collection_CantAddNull), "webPartDescriptions");
+                }
+                WebPartDescription description = obj as WebPartDescription;
+                if (description == null) {
+                    throw new ArgumentException(SR.GetString(SR.Collection_InvalidType, "WebPartDescription"),
+                                                "webPartDescriptions");
+                }
+                string id = description.ID;
+                if (!_ids.Contains(id)) {
+                    InnerList.Add(description);
+                    _ids.Add(id, description);
+                }
+                else {
+                    throw new ArgumentException(SR.GetString(SR.WebPart_Collection_DuplicateID, "WebPartDescription", id), "webPartDescriptions");
+                }
+            }
+        }
+
+        public bool Contains(WebPartDescription value) {
+            return InnerList.Contains(value);
+        }
+
+        public int IndexOf(WebPartDescription value) {
+            return InnerList.IndexOf(value);
+        }
+
+        public WebPartDescription this[int index] {
+            get {
+                return (WebPartDescription) InnerList[index];
+            }
+        }
+
+        public WebPartDescription this[string id] {
+            get {
+                return ((_ids != null) ? (WebPartDescription)_ids[id] : null);
+            }
+        }
+
+        public void CopyTo(WebPartDescription[] array, int index) {
+            InnerList.CopyTo(array, index);
+        }
+    }
+}