Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

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

@@ -0,0 +1,70 @@
+//------------------------------------------------------------------------------
+// <copyright file="EditorPartCollection.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//------------------------------------------------------------------------------
+namespace System.Web.UI.WebControls.WebParts {
+
+    using System;
+    using System.Collections;
+
+    public sealed class EditorPartCollection : ReadOnlyCollectionBase {
+
+        public static readonly EditorPartCollection Empty = new EditorPartCollection();
+
+        public EditorPartCollection() {
+        }
+
+        public EditorPartCollection(ICollection editorParts) {
+            Initialize(null, editorParts);
+        }
+
+        public EditorPartCollection(EditorPartCollection existingEditorParts, ICollection editorParts) {
+            Initialize(existingEditorParts, editorParts);
+        }
+
+        public EditorPart this[int index] {
+            get {
+                return (EditorPart) InnerList[index];
+            }
+        }
+
+        internal int Add(EditorPart value) {
+            return InnerList.Add(value);
+        }
+
+        public bool Contains(EditorPart editorPart) {
+            return InnerList.Contains(editorPart);
+        }
+
+        public void CopyTo(EditorPart[] array, int index) {
+            InnerList.CopyTo(array, index);
+        }
+
+        public int IndexOf(EditorPart editorPart) {
+            return InnerList.IndexOf(editorPart);
+        }
+
+        private void Initialize(EditorPartCollection existingEditorParts, ICollection editorParts) {
+            if (existingEditorParts != null) {
+                foreach (EditorPart existingEditorPart in existingEditorParts) {
+                    // Don't need to check arg, since we know it is valid since it came
+                    // from an EditorPartCollection.
+                    InnerList.Add(existingEditorPart);
+                }
+            }
+
+            if (editorParts != null) {
+                foreach (object obj in editorParts) {
+                    if (obj == null) {
+                        throw new ArgumentException(SR.GetString(SR.Collection_CantAddNull), "editorParts");
+                    }
+                    if (!(obj is EditorPart)) {
+                        throw new ArgumentException(SR.GetString(SR.Collection_InvalidType, "EditorPart"), "editorParts");
+                    }
+                    InnerList.Add(obj);
+                }
+            }
+        }
+    }
+}