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1 using System;
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2 using System.Globalization;
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3 using System.Reflection;
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4
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5 namespace BLToolkit.Reflection
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6 {
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7 /// <Summary>
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8 /// Selects a member from a list of candidates, and performs type conversion
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9 /// from actual argument type to formal argument type.
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10 /// </Summary>
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11 [Serializable]
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12 public class GenericBinder : Binder
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13 {
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14 private readonly bool _genericMethodDefinition;
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15 public GenericBinder(bool genericMethodDefinition)
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16 {
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17 _genericMethodDefinition = genericMethodDefinition;
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18 }
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19
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20 #region System.Reflection.Binder methods
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21
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22 public override MethodBase BindToMethod(BindingFlags bindingAttr, MethodBase[] match, ref object[] args,
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23 ParameterModifier[] modifiers, CultureInfo culture, string[] names, out object state)
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24 {
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25 throw new InvalidOperationException("GenericBinder.BindToMethod");
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26 }
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27
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28 public override FieldInfo BindToField(BindingFlags bindingAttr, FieldInfo[] match, object value, CultureInfo culture)
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29 {
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30 throw new InvalidOperationException("GenericBinder.BindToField");
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31 }
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32
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33 public override MethodBase SelectMethod(
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34 BindingFlags bindingAttr,
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35 MethodBase[] matchMethods,
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36 Type[] parameterTypes,
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37 ParameterModifier[] modifiers)
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38 {
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39 for (int i = 0; i < matchMethods.Length; ++i)
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40 {
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41 if (matchMethods[i].IsGenericMethodDefinition != _genericMethodDefinition)
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42 continue;
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43
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44 ParameterInfo[] pis = matchMethods[i].GetParameters();
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45 bool match = (pis.Length == parameterTypes.Length);
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46
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47 for (int j = 0; match && j < pis.Length; ++j)
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48 {
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49 match = TypeHelper.CompareParameterTypes(pis[j].ParameterType, parameterTypes[j]);
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50 }
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51
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52 if (match)
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53 return matchMethods[i];
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54 }
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55
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56 return null;
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57 }
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58
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59 public override PropertyInfo SelectProperty(BindingFlags bindingAttr, PropertyInfo[] match, Type returnType,
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60 Type[] indexes, ParameterModifier[] modifiers)
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61 {
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62 throw new InvalidOperationException("GenericBinder.SelectProperty");
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63 }
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64
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65 public override object ChangeType(object value, Type type, CultureInfo culture)
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66 {
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67 throw new InvalidOperationException("GenericBinder.ChangeType");
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68 }
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69
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70 public override void ReorderArgumentArray(ref object[] args, object state)
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71 {
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72 throw new InvalidOperationException("GenericBinder.ReorderArgumentArray");
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73 }
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74
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75 #endregion
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76
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77 private static GenericBinder _generic;
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78 public static GenericBinder Generic
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79 {
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80 get { return _generic ?? (_generic = new GenericBinder(true)); }
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81 }
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82
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83 private static GenericBinder _nonGeneric;
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84 public static GenericBinder NonGeneric
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85 {
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86 get { return _nonGeneric ?? (_nonGeneric = new GenericBinder(false)); }
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87 }
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88 }
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89 }
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