Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

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

@@ -0,0 +1,101 @@
+//------------------------------------------------------------------------------
+// <copyright file="WebPartCollection.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//------------------------------------------------------------------------------
+namespace System.Web.UI.WebControls.WebParts {
+
+    using System;
+    using System.Collections;
+    using System.Diagnostics;
+    using System.Globalization;
+
+    /// <devdoc>
+    /// Read-only collection of WebParts.  Collection cannot be modified after contstruction.
+    /// </devdoc>
+    public sealed class WebPartCollection : ReadOnlyCollectionBase {
+
+        public WebPartCollection() {
+        }
+
+        public WebPartCollection(ICollection webParts) {
+            if (webParts == null) {
+                throw new ArgumentNullException("webParts");
+            }
+
+            foreach (object obj in webParts) {
+                if (obj == null) {
+                    throw new ArgumentException(SR.GetString(SR.Collection_CantAddNull), "webParts");
+                }
+                if (!(obj is WebPart)) {
+                    throw new ArgumentException(SR.GetString(SR.Collection_InvalidType, "WebPart"), "webParts");
+                }
+                InnerList.Add(obj);
+            }
+        }
+
+        internal int Add(WebPart value) {
+            Debug.Assert(value != null);
+            return InnerList.Add(value);
+        }
+
+        public bool Contains(WebPart value) {
+            return InnerList.Contains(value);
+        }
+
+        public int IndexOf(WebPart value) {
+            return InnerList.IndexOf(value);
+        }
+
+        public WebPart this[int index] {
+            get {
+                return (WebPart) InnerList[index];
+            }
+        }
+
+        /// <devdoc>
+        /// Returns the WebPart with the specified id, or the GenericWebPart containing a control with
+        /// the specified id, or the ProxyWebPart with OriginalID or GenericWebPartID equal to the
+        /// specified id, performing a case-insensitive comparison.  Returns null if there are no matches.
+        /// </devdoc>
+        public WebPart this[string id] {
+            // PERF: Use a hashtable for lookup, instead of a linear search
+            get {
+                foreach (WebPart webPart in InnerList) {
+                    if (String.Equals(webPart.ID, id, StringComparison.OrdinalIgnoreCase)) {
+                        return webPart;
+                    }
+
+                    GenericWebPart genericWebPart = webPart as GenericWebPart;
+                    if (genericWebPart != null) {
+                        Control control = genericWebPart.ChildControl;
+                        if (control != null) {
+                            if (String.Equals(control.ID, id, StringComparison.OrdinalIgnoreCase)) {
+                                return genericWebPart;
+                            }
+                        }
+                    }
+
+                    ProxyWebPart proxyWebPart = webPart as ProxyWebPart;
+                    if (proxyWebPart != null) {
+                        if ((String.Equals(proxyWebPart.OriginalID, id, StringComparison.OrdinalIgnoreCase)) ||
+                            (String.Equals(proxyWebPart.GenericWebPartID, id, StringComparison.OrdinalIgnoreCase))) {
+                            return proxyWebPart;
+                        }
+                    }
+                }
+
+                return null;
+            }
+        }
+
+        /// <devdoc>
+        /// <para>Copies contents from the collection to a specified array with a
+        /// specified starting index.</para>
+        /// </devdoc>
+        public void CopyTo(WebPart[] array, int index) {
+            InnerList.CopyTo(array, index);
+        }
+
+    }
+}