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/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Base / MS / Internal / ComponentModel / AttachedPropertyMethodSelector.cs / 1 / AttachedPropertyMethodSelector.cs
namespace MS.Internal.ComponentModel { using System; using System.Collections.Generic; using System.ComponentModel; using System.Diagnostics; using System.Globalization; using System.Reflection; using System.Security.Permissions; using System.Windows; ////// This is a reflection binder that is used to /// find the right method match for attached properties. /// The default binder in the CLR will not find a /// method match unless the parameters we provide are /// exact matches. This binder will use compatible type /// matching to find a match for any parameters that are /// compatible. /// internal class AttachedPropertyMethodSelector : Binder { ////// The only method we implement. Our goal here is to find a method that best matches the arguments passed. /// We are doing this only with the intent of pulling attached property metadata off of the method. /// If there are ambiguous methods, we simply take the first one as all "Get" methods for an attached /// property should have identical metadata. /// public override MethodBase SelectMethod(BindingFlags bindingAttr, MethodBase[] match, Type[] types, ParameterModifier[] modifiers) { // Short circuit for cases where someone didn't pass in a types array. if (types == null) { if (match.Length > 1) { throw new AmbiguousMatchException(); } else { return match[0]; } } for(int idx = 0; idx < match.Length; idx++) { MethodBase candidate = match[idx]; ParameterInfo[] parameters = candidate.GetParameters(); if (ParametersMatch(parameters, types)) { return candidate; } } return null; } ////// This method checks that the parameters passed in are /// compatible with the provided parameter types. /// private static bool ParametersMatch(ParameterInfo[] parameters, Type[] types) { if (parameters.Length != types.Length) { return false; } // IsAssignableFrom is not cheap. Do this in two passes. // Our first pass checks for exact type matches. Only on // the second pass do we do an IsAssignableFrom. bool compat = true; for(int idx = 0; idx < parameters.Length; idx++) { ParameterInfo p = parameters[idx]; Type t = types[idx]; if (p.ParameterType != t) { compat = false; break; } } if (compat) { return true; } // Second pass uses IsAssignableFrom to check for compatible types. compat = true; for(int idx = 0; idx < parameters.Length; idx++) { ParameterInfo p = parameters[idx]; Type t = types[idx]; if (!t.IsAssignableFrom(p.ParameterType)) { compat = false; break; } } return compat; } ////// We do not implement this. /// public override MethodBase BindToMethod(BindingFlags bindingAttr, MethodBase[] match, ref object[] args, ParameterModifier[] modifiers, CultureInfo culture, string[] names, out object state) { // We are only a method binder. throw new NotImplementedException(); } ////// We do not implement this. /// public override FieldInfo BindToField(BindingFlags bindingAttr, FieldInfo[] match, object value, CultureInfo culture) { // We are only a method binder. throw new NotImplementedException(); } ////// We do not implement this. /// public override object ChangeType(object value, Type type, CultureInfo culture) { // We are only a method binder. throw new NotImplementedException(); } ////// We do not implement this. /// public override void ReorderArgumentArray(ref object[] args, object state) { // We are only a method binder. throw new NotImplementedException(); } ////// We do not implement this. /// public override PropertyInfo SelectProperty(BindingFlags bindingAttr, PropertyInfo[] match, Type returnType, Type[] indexes, ParameterModifier[] modifiers) { // We are only a method binder. throw new NotImplementedException(); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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