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 {
20 /// Represents the create dynamic operation at the call site, providing the binding semantic and the details about the operation.
22 public abstract class CreateInstanceBinder : DynamicMetaObjectBinder {
23 private readonly CallInfo _callInfo;
26 /// Initializes a new intsance of the <see cref="CreateInstanceBinder" />.
28 /// <param name="callInfo">The signature of the arguments at the call site.</param>
29 protected CreateInstanceBinder(CallInfo callInfo) {
30 ContractUtils.RequiresNotNull(callInfo, "callInfo");
35 /// The result type of the operation.
37 public override sealed Type ReturnType {
38 get { return typeof(object); }
42 /// Gets the signature of the arguments at the call site.
44 public CallInfo CallInfo {
45 get { return _callInfo; }
49 /// Performs the binding of the dynamic create operation if the target dynamic object cannot bind.
51 /// <param name="target">The target of the dynamic create operation.</param>
52 /// <param name="args">The arguments of the dynamic create operation.</param>
53 /// <returns>The <see cref="DynamicMetaObject"/> representing the result of the binding.</returns>
54 public DynamicMetaObject FallbackCreateInstance(DynamicMetaObject target, DynamicMetaObject[] args) {
55 return FallbackCreateInstance(target, args, null);
59 /// When overridden in the derived class, performs the binding of the dynamic create operation if the target dynamic object cannot bind.
61 /// <param name="target">The target of the dynamic create operation.</param>
62 /// <param name="args">The arguments of the dynamic create operation.</param>
63 /// <param name="errorSuggestion">The binding result to use if binding fails, or null.</param>
64 /// <returns>The <see cref="DynamicMetaObject"/> representing the result of the binding.</returns>
65 public abstract DynamicMetaObject FallbackCreateInstance(DynamicMetaObject target, DynamicMetaObject[] args, DynamicMetaObject errorSuggestion);
68 /// Performs the binding of the dynamic create operation.
70 /// <param name="target">The target of the dynamic create operation.</param>
71 /// <param name="args">An array of arguments of the dynamic create operation.</param>
72 /// <returns>The <see cref="DynamicMetaObject"/> representing the result of the binding.</returns>
73 public sealed override DynamicMetaObject Bind(DynamicMetaObject target, DynamicMetaObject[] args) {
74 ContractUtils.RequiresNotNull(target, "target");
75 ContractUtils.RequiresNotNullItems(args, "args");
77 return target.BindCreateInstance(this, args);
80 // this is a standard DynamicMetaObjectBinder
81 internal override sealed bool IsStandardBinder {