Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

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

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+//------------------------------------------------------------------------------
+// <copyright file="IWebPartParameters.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//------------------------------------------------------------------------------
+
+namespace System.Web.UI.WebControls.WebParts {
+
+    using System;
+    using System.Collections;
+    using System.ComponentModel;
+
+    // Because of the SetConsumerSchema method, this interface only supports 1 consumer
+    // at a time.  As a result, it is most useful when an IWebPartParameters consumer connects
+    // to a provider via a transformer, like RowToParametersTransformer.  Alternatively, the
+    // provider WebPart could specify AllowsMultipleConnections=false for the ConnectionPoint.
+    public interface IWebPartParameters {
+        PropertyDescriptorCollection Schema { get; }
+        void GetParametersData(ParametersCallback callback);
+        void SetConsumerSchema(PropertyDescriptorCollection schema);
+    }
+}