1 /* ****************************************************************************
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3 * Copyright (c) Microsoft Corporation. All rights reserved.
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5 * This software is subject to the Microsoft Public License (Ms-PL).
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6 * A copy of the license can be found in the license.htm file included
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7 * in this distribution.
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9 * You must not remove this notice, or any other, from this software.
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11 * ***************************************************************************/
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13 namespace System.Web.Mvc {
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15 using System.Collections.Generic;
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17 using System.Reflection;
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18 using System.Web.Mvc.Resources;
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20 public class ReflectedActionDescriptor : ActionDescriptor {
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22 private readonly string _actionName;
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23 private readonly ControllerDescriptor _controllerDescriptor;
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24 private ParameterDescriptor[] _parametersCache;
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26 public ReflectedActionDescriptor(MethodInfo methodInfo, string actionName, ControllerDescriptor controllerDescriptor)
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27 : this(methodInfo, actionName, controllerDescriptor, true /* validateMethod */) {
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30 internal ReflectedActionDescriptor(MethodInfo methodInfo, string actionName, ControllerDescriptor controllerDescriptor, bool validateMethod) {
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31 if (methodInfo == null) {
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32 throw new ArgumentNullException("methodInfo");
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34 if (String.IsNullOrEmpty(actionName)) {
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35 throw new ArgumentException(MvcResources.Common_NullOrEmpty, "actionName");
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37 if (controllerDescriptor == null) {
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38 throw new ArgumentNullException("controllerDescriptor");
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41 if (validateMethod) {
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42 string failedMessage = VerifyActionMethodIsCallable(methodInfo);
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43 if (failedMessage != null) {
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44 throw new ArgumentException(failedMessage, "methodInfo");
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48 MethodInfo = methodInfo;
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49 _actionName = actionName;
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50 _controllerDescriptor = controllerDescriptor;
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53 public override string ActionName {
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59 public override ControllerDescriptor ControllerDescriptor {
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61 return _controllerDescriptor;
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65 public MethodInfo MethodInfo {
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70 public override object Execute(ControllerContext controllerContext, IDictionary<string, object> parameters) {
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71 if (controllerContext == null) {
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72 throw new ArgumentNullException("controllerContext");
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74 if (parameters == null) {
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75 throw new ArgumentNullException("parameters");
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78 ParameterInfo[] parameterInfos = MethodInfo.GetParameters();
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79 var rawParameterValues = from parameterInfo in parameterInfos
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80 select ExtractParameterFromDictionary(parameterInfo, parameters, MethodInfo);
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81 object[] parametersArray = rawParameterValues.ToArray();
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83 ActionMethodDispatcher dispatcher = DispatcherCache.GetDispatcher(MethodInfo);
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84 object actionReturnValue = dispatcher.Execute(controllerContext.Controller, parametersArray);
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85 return actionReturnValue;
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88 public override object[] GetCustomAttributes(bool inherit) {
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89 return MethodInfo.GetCustomAttributes(inherit);
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92 public override object[] GetCustomAttributes(Type attributeType, bool inherit) {
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93 return MethodInfo.GetCustomAttributes(attributeType, inherit);
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96 public override FilterInfo GetFilters() {
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97 return GetFilters(MethodInfo);
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100 public override ParameterDescriptor[] GetParameters() {
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101 ParameterDescriptor[] parameters = LazilyFetchParametersCollection();
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103 // need to clone array so that user modifications aren't accidentally stored
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104 return (ParameterDescriptor[])parameters.Clone();
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107 public override ICollection<ActionSelector> GetSelectors() {
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108 ActionMethodSelectorAttribute[] attrs = (ActionMethodSelectorAttribute[])MethodInfo.GetCustomAttributes(typeof(ActionMethodSelectorAttribute), true /* inherit */);
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109 ActionSelector[] selectors = Array.ConvertAll(attrs, attr => (ActionSelector)(controllerContext => attr.IsValidForRequest(controllerContext, MethodInfo)));
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113 public override bool IsDefined(Type attributeType, bool inherit) {
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114 return MethodInfo.IsDefined(attributeType, inherit);
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117 private ParameterDescriptor[] LazilyFetchParametersCollection() {
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118 return DescriptorUtil.LazilyFetchOrCreateDescriptors<ParameterInfo, ParameterDescriptor>(
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119 ref _parametersCache /* cacheLocation */,
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120 MethodInfo.GetParameters /* initializer */,
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121 parameterInfo => new ReflectedParameterDescriptor(parameterInfo, this) /* converter */);
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124 internal static ReflectedActionDescriptor TryCreateDescriptor(MethodInfo methodInfo, string name, ControllerDescriptor controllerDescriptor) {
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125 ReflectedActionDescriptor descriptor = new ReflectedActionDescriptor(methodInfo, name, controllerDescriptor, false /* validateMethod */);
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126 string failedMessage = VerifyActionMethodIsCallable(methodInfo);
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127 return (failedMessage == null) ? descriptor : null;
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