5 // Jb Evain (jbevain@novell.com)
7 // (C) 2008 Novell, Inc. (http://www.novell.com)
9 // Permission is hereby granted, free of charge, to any person obtaining
10 // a copy of this software and associated documentation files (the
11 // "Software"), to deal in the Software without restriction, including
12 // without limitation the rights to use, copy, modify, merge, publish,
13 // distribute, sublicense, and/or sell copies of the Software, and to
14 // permit persons to whom the Software is furnished to do so, subject to
15 // the following conditions:
17 // The above copyright notice and this permission notice shall be
18 // included in all copies or substantial portions of the Software.
20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
30 using System.Reflection;
31 using System.Reflection.Emit;
32 using System.Runtime.CompilerServices;
34 namespace System.Linq.Expressions {
36 static class Extensions {
38 public static bool IsGenericInstanceOf (this Type self, Type type)
40 if (!self.IsGenericType)
43 return self.GetGenericTypeDefinition () == type;
46 public static bool IsNullable (this Type self)
48 return self.IsValueType && self.IsGenericInstanceOf (typeof (Nullable<>));
51 public static bool IsExpression (this Type self)
53 return self == typeof (Expression) || self.IsSubclassOf (typeof (Expression));
56 public static bool IsGenericImplementationOf (this Type self, Type type)
58 foreach (Type iface in self.GetInterfaces ())
59 if (iface.IsGenericInstanceOf (type))
64 public static bool IsAssignableTo (this Type self, Type type)
66 return type.IsAssignableFrom (self) ||
67 ArrayTypeIsAssignableTo (self, type);
70 public static Type GetFirstGenericArgument (this Type self)
72 return self.GetGenericArguments () [0];
75 public static Type MakeGenericTypeFrom (this Type self, Type type)
77 return self.MakeGenericType (type.GetGenericArguments ());
80 public static Type MakeNullableType (this Type self)
82 return typeof (Nullable<>).MakeGenericType (self);
85 public static Type GetNotNullableType (this Type self)
87 return self.IsNullable () ? self.GetFirstGenericArgument () : self;
90 public static MethodInfo GetInvokeMethod (this Type self)
92 return self.GetMethod ("Invoke", BindingFlags.Public | BindingFlags.Instance);
95 public static MethodInfo MakeGenericMethodFrom (this MethodInfo self, MethodInfo method)
97 return self.MakeGenericMethod (method.GetGenericArguments ());
100 public static Type [] GetParameterTypes (this MethodBase self)
102 var parameters = self.GetParameters ();
103 var types = new Type [parameters.Length];
105 for (int i = 0; i < types.Length; i++)
106 types [i] = parameters [i].ParameterType;
111 static bool ArrayTypeIsAssignableTo (Type type, Type candidate)
113 if (!type.IsArray || !candidate.IsArray)
116 if (type.GetArrayRank () != candidate.GetArrayRank ())
119 return type.GetElementType ().IsAssignableTo (candidate.GetElementType ());
122 public static void OnFieldOrProperty (this MemberInfo self,
123 Action<FieldInfo> onfield, Action<PropertyInfo> onprop)
125 switch (self.MemberType) {
126 case MemberTypes.Field:
127 onfield ((FieldInfo) self);
129 case MemberTypes.Property:
130 onprop ((PropertyInfo) self);
133 throw new ArgumentException ();
137 public static T OnFieldOrProperty<T> (this MemberInfo self,
138 Func<FieldInfo, T> onfield, Func<PropertyInfo, T> onprop)
140 switch (self.MemberType) {
141 case MemberTypes.Field:
142 return onfield ((FieldInfo) self);
143 case MemberTypes.Property:
144 return onprop ((PropertyInfo) self);
146 throw new ArgumentException ();
150 public static Type MakeStrongBoxType (this Type self)
152 return typeof (StrongBox<>).MakeGenericType (self);