Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

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

@@ -0,0 +1,96 @@
+//------------------------------------------------------------------------------
+// <copyright file="ConnectionProviderAttribute.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//------------------------------------------------------------------------------
+
+namespace System.Web.UI.WebControls.WebParts {
+
+    using System;
+    using System.ComponentModel;
+    using System.Reflection;
+
+    [AttributeUsage(AttributeTargets.Method)]
+    public class ConnectionProviderAttribute : Attribute {
+
+        private string _displayName;
+        private string _id;
+        private Type _connectionPointType;
+        private bool _allowsMultipleConnections;
+
+        public ConnectionProviderAttribute(string displayName) {
+            if (String.IsNullOrEmpty(displayName)) {
+                throw new ArgumentNullException("displayName");
+            }
+
+            _displayName = displayName;
+            _allowsMultipleConnections = true;
+        }
+
+        public ConnectionProviderAttribute(string displayName, string id) : this(displayName) {
+            if (String.IsNullOrEmpty(id)) {
+                throw new ArgumentNullException("id");
+            }
+
+            _id = id;
+        }
+
+        public ConnectionProviderAttribute(string displayName, Type connectionPointType) : this(displayName) {
+            if (connectionPointType == null) {
+                throw new ArgumentNullException("connectionPointType");
+            }
+
+            _connectionPointType = connectionPointType;
+        }
+
+        public ConnectionProviderAttribute(string displayName, string id, Type connectionPointType) : this(displayName, connectionPointType) {
+            if (String.IsNullOrEmpty(id)) {
+                throw new ArgumentNullException("id");
+            }
+
+            _id = id;
+        }
+
+        public bool AllowsMultipleConnections {
+            get {
+                return _allowsMultipleConnections;
+            }
+            set {
+                _allowsMultipleConnections = value;
+            }
+        }
+
+        public string ID {
+            get {
+                return (_id != null) ? _id : String.Empty;
+            }
+        }
+
+        public virtual string DisplayName {
+            get {
+                return DisplayNameValue;
+            }
+        }
+
+        protected string DisplayNameValue {
+            get {
+                return _displayName;
+            }
+            set {
+                _displayName = value;
+            }
+        }
+
+        public Type ConnectionPointType {
+            get {
+                if (WebPartUtil.IsConnectionPointTypeValid(_connectionPointType, /*isConsumer*/ false)) {
+                    return _connectionPointType;
+                }
+                else {
+                    throw new InvalidOperationException(SR.GetString(SR.ConnectionProviderAttribute_InvalidConnectionPointType, _connectionPointType.Name));
+                }
+            }
+        }
+    }
+}
+