1 // Licensed to the .NET Foundation under one or more agreements. 2 // The .NET Foundation licenses this file to you under the MIT license. 3 // See the LICENSE file in the project root for more information. 4 5 using System.Dynamic.Utils; 6 7 namespace System.Dynamic 8 { 9 /// <summary> 10 /// Represents the dynamic set member operation at the call site, providing the binding semantic and the details about the operation. 11 /// </summary> 12 public abstract class SetMemberBinder : DynamicMetaObjectBinder 13 { 14 /// <summary> 15 /// Initializes a new instance of the <see cref="SetMemberBinder" />. 16 /// </summary> 17 /// <param name="name">The name of the member to get.</param> 18 /// <param name="ignoreCase">true if the name should be matched ignoring case; false otherwise.</param> SetMemberBinder(string name, bool ignoreCase)19 protected SetMemberBinder(string name, bool ignoreCase) 20 { 21 ContractUtils.RequiresNotNull(name, nameof(name)); 22 23 Name = name; 24 IgnoreCase = ignoreCase; 25 } 26 27 /// <summary> 28 /// The result type of the operation. 29 /// </summary> 30 public override sealed Type ReturnType => typeof(object); 31 32 /// <summary> 33 /// Gets the name of the member to get. 34 /// </summary> 35 public string Name { get; } 36 37 /// <summary> 38 /// Gets the value indicating if the string comparison should ignore the case of the member name. 39 /// </summary> 40 public bool IgnoreCase { get; } 41 42 /// <summary> 43 /// Performs the binding of the dynamic set member operation. 44 /// </summary> 45 /// <param name="target">The target of the dynamic set member operation.</param> 46 /// <param name="args">An array of arguments of the dynamic set member operation.</param> 47 /// <returns>The <see cref="DynamicMetaObject"/> representing the result of the binding.</returns> Bind(DynamicMetaObject target, DynamicMetaObject[] args)48 public sealed override DynamicMetaObject Bind(DynamicMetaObject target, DynamicMetaObject[] args) 49 { 50 ContractUtils.RequiresNotNull(target, nameof(target)); 51 ContractUtils.RequiresNotNull(args, nameof(args)); 52 ContractUtils.Requires(args.Length == 1, nameof(args)); 53 54 var arg0 = args[0]; 55 ContractUtils.RequiresNotNull(arg0, nameof(args)); 56 57 return target.BindSetMember(this, arg0); 58 } 59 60 /// <summary> 61 /// Always returns <c>true</c> because this is a standard <see cref="DynamicMetaObjectBinder"/>. 62 /// </summary> 63 internal override sealed bool IsStandardBinder => true; 64 65 /// <summary> 66 /// Performs the binding of the dynamic set member operation if the target dynamic object cannot bind. 67 /// </summary> 68 /// <param name="target">The target of the dynamic set member operation.</param> 69 /// <param name="value">The value to set to the member.</param> 70 /// <returns>The <see cref="DynamicMetaObject"/> representing the result of the binding.</returns> FallbackSetMember(DynamicMetaObject target, DynamicMetaObject value)71 public DynamicMetaObject FallbackSetMember(DynamicMetaObject target, DynamicMetaObject value) 72 { 73 return FallbackSetMember(target, value, null); 74 } 75 76 /// <summary> 77 /// Performs the binding of the dynamic set member operation if the target dynamic object cannot bind. 78 /// </summary> 79 /// <param name="target">The target of the dynamic set member operation.</param> 80 /// <param name="value">The value to set to the member.</param> 81 /// <param name="errorSuggestion">The binding result to use if binding fails, or null.</param> 82 /// <returns>The <see cref="DynamicMetaObject"/> representing the result of the binding.</returns> FallbackSetMember(DynamicMetaObject target, DynamicMetaObject value, DynamicMetaObject errorSuggestion)83 public abstract DynamicMetaObject FallbackSetMember(DynamicMetaObject target, DynamicMetaObject value, DynamicMetaObject errorSuggestion); 84 } 85 } 86