private static Type CreateProxyType(Type interfaceType)
{
if (!interfaceType.IsInterface) {
throw new ArgumentException("Only interfaces can be proxied", "interfaceType");
}
string name = string.Format("Proxy<{0}>", Regex.Replace(interfaceType.AssemblyQualifiedName ?? interfaceType.FullName ?? interfaceType.Name, @"[\s,]+", "_"));
List<Type> allInterfaces = new List<Type> {
interfaceType
};
allInterfaces.AddRange(interfaceType.GetInterfaces());
Debug.WriteLine(name, "Emitting proxy type");
TypeBuilder typeBuilder = proxyModule.DefineType(name, TypeAttributes.Class|TypeAttributes.Sealed|TypeAttributes.Public, typeof(ProxyBase), allInterfaces.ToArray());
ConstructorBuilder constructorBuilder = typeBuilder.DefineConstructor(MethodAttributes.Public, CallingConventions.Standard, Type.EmptyTypes);
ILGenerator ctorIl = constructorBuilder.GetILGenerator();
ctorIl.Emit(OpCodes.Ldarg_0);
ctorIl.Emit(OpCodes.Call, proxyBase_ctor);
ctorIl.Emit(OpCodes.Ret);
FieldBuilder propertyChangedField = null;
if (typeof(INotifyPropertyChanged).IsAssignableFrom(interfaceType)) {
propertyChangedField = typeBuilder.DefineField("PropertyChanged", typeof(PropertyChangedEventHandler), FieldAttributes.Private);
MethodBuilder addPropertyChangedMethod = typeBuilder.DefineMethod("add_PropertyChanged", MethodAttributes.Public|MethodAttributes.HideBySig|MethodAttributes.SpecialName|MethodAttributes.NewSlot|MethodAttributes.Virtual, typeof(void), new[] {typeof(PropertyChangedEventHandler)});
ILGenerator addIl = addPropertyChangedMethod.GetILGenerator();
addIl.Emit(OpCodes.Ldarg_0);
addIl.Emit(OpCodes.Dup);
addIl.Emit(OpCodes.Ldfld, propertyChangedField);
addIl.Emit(OpCodes.Ldarg_1);
addIl.Emit(OpCodes.Call, delegate_Combine);
addIl.Emit(OpCodes.Castclass, typeof(PropertyChangedEventHandler));
addIl.Emit(OpCodes.Stfld, propertyChangedField);
addIl.Emit(OpCodes.Ret);
MethodBuilder removePropertyChangedMethod = typeBuilder.DefineMethod("remove_PropertyChanged", MethodAttributes.Public|MethodAttributes.HideBySig|MethodAttributes.SpecialName|MethodAttributes.NewSlot|MethodAttributes.Virtual, typeof(void), new[] {typeof(PropertyChangedEventHandler)});
ILGenerator removeIl = removePropertyChangedMethod.GetILGenerator();
removeIl.Emit(OpCodes.Ldarg_0);
removeIl.Emit(OpCodes.Dup);
removeIl.Emit(OpCodes.Ldfld, propertyChangedField);
removeIl.Emit(OpCodes.Ldarg_1);
removeIl.Emit(OpCodes.Call, delegate_Remove);
removeIl.Emit(OpCodes.Castclass, typeof(PropertyChangedEventHandler));
removeIl.Emit(OpCodes.Stfld, propertyChangedField);
removeIl.Emit(OpCodes.Ret);
typeBuilder.DefineMethodOverride(addPropertyChangedMethod, iNotifyPropertyChanged_PropertyChanged.GetAddMethod());
typeBuilder.DefineMethodOverride(removePropertyChangedMethod, iNotifyPropertyChanged_PropertyChanged.GetRemoveMethod());
}
List<PropertyInfo> propertiesToImplement = new List<PropertyInfo>();
// first we collect all properties, those with setters before getters in order to enable less specific redundant getters
foreach (PropertyInfo property in allInterfaces.Where(intf => intf != typeof(INotifyPropertyChanged)).SelectMany(intf => intf.GetProperties())) {
if (property.CanWrite) {
propertiesToImplement.Insert(0, property);
} else {
propertiesToImplement.Add(property);
}
}
Dictionary<string, PropertyEmitter> fieldBuilders = new Dictionary<string, PropertyEmitter>();
foreach (PropertyInfo property in propertiesToImplement) {
PropertyEmitter propertyEmitter;
if (fieldBuilders.TryGetValue(property.Name, out propertyEmitter)) {
if ((propertyEmitter.PropertyType != property.PropertyType) && ((property.CanWrite) || (!property.PropertyType.IsAssignableFrom(propertyEmitter.PropertyType)))) {
throw new ArgumentException(string.Format("The interface has a conflicting property {0}", property.Name), "interfaceType");
}
} else {
fieldBuilders.Add(property.Name, propertyEmitter = new PropertyEmitter(typeBuilder, property.Name, property.PropertyType, propertyChangedField));
}
if (property.CanRead) {
typeBuilder.DefineMethodOverride(propertyEmitter.GetGetter(property.PropertyType), property.GetGetMethod());
}
if (property.CanWrite) {
typeBuilder.DefineMethodOverride(propertyEmitter.GetSetter(property.PropertyType), property.GetSetMethod());
}
}
return typeBuilder.CreateType();
}
private static Type CreateProxyType(Type interfaceType)
{
if (!interfaceType.IsInterface)
{
throw new ArgumentException("Only interfaces can be proxied", "interfaceType");
}
string name = string.Format("Proxy<{0}>", Regex.Replace(interfaceType.AssemblyQualifiedName ?? interfaceType.FullName ?? interfaceType.Name, @"[\s,]+", "_"));
List <Type> allInterfaces = new List <Type> {
interfaceType
};
allInterfaces.AddRange(interfaceType.GetInterfaces());
Debug.WriteLine(name, "Emitting proxy type");
TypeBuilder typeBuilder = proxyModule.DefineType(name, TypeAttributes.Class | TypeAttributes.Sealed | TypeAttributes.Public, typeof(ProxyBase), allInterfaces.ToArray());
ConstructorBuilder constructorBuilder = typeBuilder.DefineConstructor(MethodAttributes.Public, CallingConventions.Standard, Type.EmptyTypes);
ILGenerator ctorIl = constructorBuilder.GetILGenerator();
ctorIl.Emit(OpCodes.Ldarg_0);
ctorIl.Emit(OpCodes.Call, proxyBase_ctor);
ctorIl.Emit(OpCodes.Ret);
FieldBuilder propertyChangedField = null;
if (typeof(INotifyPropertyChanged).IsAssignableFrom(interfaceType))
{
propertyChangedField = typeBuilder.DefineField("PropertyChanged", typeof(PropertyChangedEventHandler), FieldAttributes.Private);
MethodBuilder addPropertyChangedMethod = typeBuilder.DefineMethod("add_PropertyChanged", MethodAttributes.Public | MethodAttributes.HideBySig | MethodAttributes.SpecialName | MethodAttributes.NewSlot | MethodAttributes.Virtual, typeof(void), new[] { typeof(PropertyChangedEventHandler) });
ILGenerator addIl = addPropertyChangedMethod.GetILGenerator();
addIl.Emit(OpCodes.Ldarg_0);
addIl.Emit(OpCodes.Dup);
addIl.Emit(OpCodes.Ldfld, propertyChangedField);
addIl.Emit(OpCodes.Ldarg_1);
addIl.Emit(OpCodes.Call, delegate_Combine);
addIl.Emit(OpCodes.Castclass, typeof(PropertyChangedEventHandler));
addIl.Emit(OpCodes.Stfld, propertyChangedField);
addIl.Emit(OpCodes.Ret);
MethodBuilder removePropertyChangedMethod = typeBuilder.DefineMethod("remove_PropertyChanged", MethodAttributes.Public | MethodAttributes.HideBySig | MethodAttributes.SpecialName | MethodAttributes.NewSlot | MethodAttributes.Virtual, typeof(void), new[] { typeof(PropertyChangedEventHandler) });
ILGenerator removeIl = removePropertyChangedMethod.GetILGenerator();
removeIl.Emit(OpCodes.Ldarg_0);
removeIl.Emit(OpCodes.Dup);
removeIl.Emit(OpCodes.Ldfld, propertyChangedField);
removeIl.Emit(OpCodes.Ldarg_1);
removeIl.Emit(OpCodes.Call, delegate_Remove);
removeIl.Emit(OpCodes.Castclass, typeof(PropertyChangedEventHandler));
removeIl.Emit(OpCodes.Stfld, propertyChangedField);
removeIl.Emit(OpCodes.Ret);
typeBuilder.DefineMethodOverride(addPropertyChangedMethod, iNotifyPropertyChanged_PropertyChanged.GetAddMethod());
typeBuilder.DefineMethodOverride(removePropertyChangedMethod, iNotifyPropertyChanged_PropertyChanged.GetRemoveMethod());
}
List <PropertyInfo> propertiesToImplement = new List <PropertyInfo>();
// first we collect all properties, those with setters before getters in order to enable less specific redundant getters
foreach (PropertyInfo property in allInterfaces.Where(intf => intf != typeof(INotifyPropertyChanged)).SelectMany(intf => intf.GetProperties()))
{
if (property.CanWrite)
{
propertiesToImplement.Insert(0, property);
}
else
{
propertiesToImplement.Add(property);
}
}
Dictionary <string, PropertyEmitter> fieldBuilders = new Dictionary <string, PropertyEmitter>();
foreach (PropertyInfo property in propertiesToImplement)
{
PropertyEmitter propertyEmitter;
if (fieldBuilders.TryGetValue(property.Name, out propertyEmitter))
{
if ((propertyEmitter.PropertyType != property.PropertyType) && ((property.CanWrite) || (!property.PropertyType.IsAssignableFrom(propertyEmitter.PropertyType))))
{
throw new ArgumentException(string.Format("The interface has a conflicting property {0}", property.Name), "interfaceType");
}
}
else
{
fieldBuilders.Add(property.Name, propertyEmitter = new PropertyEmitter(typeBuilder, property.Name, property.PropertyType, propertyChangedField));
}
if (property.CanRead)
{
typeBuilder.DefineMethodOverride(propertyEmitter.GetGetter(property.PropertyType), property.GetGetMethod());
}
if (property.CanWrite)
{
typeBuilder.DefineMethodOverride(propertyEmitter.GetSetter(property.PropertyType), property.GetSetMethod());
}
}
return(typeBuilder.CreateType());
}
