Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System/compmod/system/componentmodel/design/IComponentDiscoveryService.cs

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+//------------------------------------------------------------------------------
+// <copyright file="IComponentDiscoveryService.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>                                                                
+//------------------------------------------------------------------------------
+
+namespace System.ComponentModel.Design {
+    using System;
+    using System.Collections;
+    using System.ComponentModel.Design;
+
+    /// <devdoc>
+    /// This service allows design-time enumeration of components across the toolbox
+    /// and other available types at design-time.
+    /// </devdoc>
+    public interface IComponentDiscoveryService {
+
+        /// <devdoc>
+        ///     Retrieves the list of available component types, i.e. types implementing
+        ///     IComponent. If baseType is null, all components are retrieved; otherwise
+        ///     only component types derived from the specified baseType are returned.
+        /// </devdoc>    
+        ICollection GetComponentTypes(IDesignerHost designerHost, Type baseType);
+    }
+}