Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

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

@@ -0,0 +1,127 @@
+//------------------------------------------------------------------------------
+// <copyright file="WebPartDisplayModeCollection.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 WebPartDisplayModeCollection : CollectionBase {
+        private bool _readOnly;
+        private string _readOnlyExceptionMessage;
+
+        // Prevent instantiation outside of our assembly.  We want third-part code to use the collection
+        // returned by the base method, not create a new collection.
+        internal WebPartDisplayModeCollection() {
+        }
+
+        public bool IsReadOnly {
+            get {
+                return _readOnly;
+            }
+        }
+
+        public WebPartDisplayMode this[int index] {
+            get {
+                return (WebPartDisplayMode)List[index];
+            }
+        }
+
+        public WebPartDisplayMode this[string modeName] {
+            get {
+                foreach (WebPartDisplayMode displayMode in List) {
+                    if (String.Equals(displayMode.Name, modeName, StringComparison.OrdinalIgnoreCase)) {
+                        return displayMode;
+                    }
+                }
+
+                return null;
+            }
+        }
+
+        public int Add(WebPartDisplayMode value) {
+            return List.Add(value);
+        }
+
+        internal int AddInternal(WebPartDisplayMode value) {
+            bool isReadOnly = _readOnly;
+
+            _readOnly = false;
+            // Extra try-catch block to prevent elevation of privilege attack via exception filter
+            try {
+                try {
+                    return List.Add(value);
+                }
+                finally {
+                    _readOnly = isReadOnly;
+                }
+            }
+            catch {
+                throw;
+            }
+        }
+
+        private void CheckReadOnly() {
+            if (_readOnly) {
+                throw new InvalidOperationException(SR.GetString(_readOnlyExceptionMessage));
+            }
+        }
+
+        public bool Contains(WebPartDisplayMode value) {
+            return List.Contains(value);
+        }
+
+        public void CopyTo(WebPartDisplayMode[] array, int index) {
+            List.CopyTo(array, index);
+        }
+
+        public int IndexOf(WebPartDisplayMode value) {
+            return List.IndexOf(value);
+        }
+
+        public void Insert(int index, WebPartDisplayMode value) {
+            List.Insert(index, value);
+        }
+
+        protected override void OnClear() {
+            throw new InvalidOperationException(SR.GetString(SR.WebPartDisplayModeCollection_CantRemove));
+        }
+
+        protected override void OnInsert(int index, object value) {
+            CheckReadOnly();
+            WebPartDisplayMode displayMode = (WebPartDisplayMode)value;
+            foreach (WebPartDisplayMode existingDisplayMode in List) {
+                if (displayMode.Name == existingDisplayMode.Name) {
+                    throw new ArgumentException(SR.GetString(SR.WebPartDisplayModeCollection_DuplicateName, displayMode.Name));
+                }
+            }
+            base.OnInsert(index, value);
+        }
+
+        protected override void OnRemove(int index, object value) {
+            throw new InvalidOperationException(SR.GetString(SR.WebPartDisplayModeCollection_CantRemove));
+        }
+
+        protected override void OnSet(int index, object oldValue, object newValue) {
+            throw new InvalidOperationException(SR.GetString(SR.WebPartDisplayModeCollection_CantSet));
+        }
+
+        protected override void OnValidate(object value) {
+            base.OnValidate(value);
+            if (value == null) {
+                throw new ArgumentNullException("value", SR.GetString(SR.Collection_CantAddNull));
+            }
+            if (!(value is WebPartDisplayMode)) {
+                throw new ArgumentException(SR.GetString(SR.Collection_InvalidType, "WebPartDisplayMode"), "value");
+            }
+        }
+
+        internal void SetReadOnly(string exceptionMessage) {
+            _readOnlyExceptionMessage = exceptionMessage;
+            _readOnly = true;
+        }
+    }
+}