1 /* ****************************************************************************
3 * Copyright (c) Microsoft Corporation.
5 * This source code is subject to terms and conditions of the Apache License, Version 2.0. A
6 * copy of the license can be found in the License.html file at the root of this distribution. If
7 * you cannot locate the Apache License, Version 2.0, please send an email to
8 * dlr@microsoft.com. By using this source code in any fashion, you are agreeing to be bound
9 * by the terms of the Apache License, Version 2.0.
11 * You must not remove this notice, or any other, from this software.
14 * ***************************************************************************/
16 using System.Dynamic.Utils;
18 namespace System.Dynamic {
21 /// Represents the invoke dynamic operation at the call site, providing the binding semantic and the details about the operation.
23 public abstract class InvokeBinder : DynamicMetaObjectBinder {
24 private readonly CallInfo _callInfo;
27 /// Initializes a new instance of the <see cref="InvokeBinder" />.
29 /// <param name="callInfo">The signature of the arguments at the call site.</param>
30 protected InvokeBinder(CallInfo callInfo) {
31 ContractUtils.RequiresNotNull(callInfo, "callInfo");
36 /// The result type of the operation.
38 public override sealed Type ReturnType {
39 get { return typeof(object); }
43 /// Gets the signature of the arguments at the call site.
45 public CallInfo CallInfo {
46 get { return _callInfo; }
50 /// Performs the binding of the dynamic invoke operation if the target dynamic object cannot bind.
52 /// <param name="target">The target of the dynamic invoke operation.</param>
53 /// <param name="args">The arguments of the dynamic invoke operation.</param>
54 /// <returns>The <see cref="DynamicMetaObject"/> representing the result of the binding.</returns>
55 public DynamicMetaObject FallbackInvoke(DynamicMetaObject target, DynamicMetaObject[] args) {
56 return FallbackInvoke(target, args, null);
60 /// Performs the binding of the dynamic invoke operation if the target dynamic object cannot bind.
62 /// <param name="target">The target of the dynamic invoke operation.</param>
63 /// <param name="args">The arguments of the dynamic invoke operation.</param>
64 /// <param name="errorSuggestion">The binding result to use if binding fails, or null.</param>
65 /// <returns>The <see cref="DynamicMetaObject"/> representing the result of the binding.</returns>
66 public abstract DynamicMetaObject FallbackInvoke(DynamicMetaObject target, DynamicMetaObject[] args, DynamicMetaObject errorSuggestion);
69 /// Performs the binding of the dynamic invoke operation.
71 /// <param name="target">The target of the dynamic invoke operation.</param>
72 /// <param name="args">An array of arguments of the dynamic invoke operation.</param>
73 /// <returns>The <see cref="DynamicMetaObject"/> representing the result of the binding.</returns>
74 public sealed override DynamicMetaObject Bind(DynamicMetaObject target, DynamicMetaObject[] args) {
75 ContractUtils.RequiresNotNull(target, "target");
76 ContractUtils.RequiresNotNullItems(args, "args");
78 return target.BindInvoke(this, args);
81 // this is a standard DynamicMetaObjectBinder
82 internal override sealed bool IsStandardBinder {