// Registers surrogates with all of the operations on the specified contract. These surrogates
// take care of representing entities in the right shape based on TypeDescriptor extensions.
private static void RegisterSurrogates(ContractDescription contractDesc, DomainServiceDescription domainServiceDescription)
{
// Cache the list of entity types and surrogate types.
HashSet <Type> exposedTypes = new HashSet <Type>();
Dictionary <Type, Tuple <Type, Func <object, object> > > exposedTypeToSurrogateMap = new Dictionary <Type, Tuple <Type, Func <object, object> > >();
HashSet <Type> surrogateTypes = new HashSet <Type>();
foreach (Type entityType in domainServiceDescription.EntityTypes)
{
exposedTypes.Add(entityType);
}
// Because complex types and entities cannot share an inheritance relationship, we can add them to the same surrogate set.
foreach (Type complexType in domainServiceDescription.ComplexTypes)
{
exposedTypes.Add(complexType);
}
foreach (Type exposedType in exposedTypes)
{
Type surrogateType = DataContractSurrogateGenerator.GetSurrogateType(exposedTypes, exposedType);
Func <object, object> surrogateFactory = (Func <object, object>)DynamicMethodUtility.GetFactoryMethod(surrogateType.GetConstructor(new Type[] { exposedType }), typeof(Func <object, object>));
Tuple <Type, Func <object, object> > surrogateInfo = new Tuple <Type, Func <object, object> >(surrogateType, surrogateFactory);
exposedTypeToSurrogateMap.Add(exposedType, surrogateInfo);
surrogateTypes.Add(surrogateType);
}
DomainServiceSerializationSurrogate surrogate = new DomainServiceSerializationSurrogate(domainServiceDescription, exposedTypeToSurrogateMap, surrogateTypes);
// Register our serialization surrogate with the WSDL exporter.
DomainServiceWsdlExportExtension wsdlExportExtension = contractDesc.Behaviors.Find <DomainServiceWsdlExportExtension>();
if (wsdlExportExtension == null)
{
wsdlExportExtension = new DomainServiceWsdlExportExtension(surrogate);
contractDesc.Behaviors.Add(wsdlExportExtension);
}
// Register our serialization surrogate with the actual invoke operations.
foreach (OperationDescription op in contractDesc.Operations)
{
foreach (Type surrogateType in surrogateTypes)
{
op.KnownTypes.Add(surrogateType);
}
DataContractSerializerOperationBehavior dataContractBehavior = op.Behaviors.Find <DataContractSerializerOperationBehavior>();
if (dataContractBehavior == null)
{
dataContractBehavior = new DataContractSerializerOperationBehavior(op);
op.Behaviors.Add(dataContractBehavior);
}
dataContractBehavior.DataContractSurrogate = surrogate;
}
}
private static void EmitProperties(TypeBuilder typeBuilder, Type type, Type parentSurrogateType, FieldInfo wrapperField, Lazy <ILGenerator> typeInitializerGenerator)
{
bool hasParent = (parentSurrogateType != typeof(object));
// Create fields for each of the properties.
foreach (PropertyDescriptor pd in TypeDescriptor.GetProperties(type))
{
// Skip properties inherited from a base class.
// We allow "holes" in the visible entity hierarchy (i.e. some entity types are not exposed
// via the DomainService and hence do not appear in the list of known entity types).
// Properties appearing in unexposed entities are lifted to the first visible subclass.
// So if our parent surrogate does not declare a property, it means we have discovered
// a hole in the visible hierarchy and must lift that property.
if (hasParent && pd.ComponentType != type && parentSurrogateType.GetProperty(pd.Name) != null)
{
continue;
}
if (SerializationUtility.IsSerializableDataMember(pd))
{
DataContractSurrogateGenerator.EmitProperty(typeBuilder, wrapperField, typeInitializerGenerator, pd, pd.Name);
}
}
}
// Emit a surrogate property for a CLR property.
// The surrogate code we'll generate will look like this:
// public <PropertyType> <PropertyName> {
// get {
// // For normal types.
// return _$wrapper.<PropertyName>;
//
// // For Binary.
// Binary value = _$wrapper.<PropertyName>;
// if (value == null) {
// return null;
// }
// return value.ToArray();
// }
// set {
// if (value == null) {
// return;
// }
//
// // For normal types.
// _$wrapper.<PropertyName> = value;
//
// // For Binary.
// Binary valueToStore;
// if (value == null) {
// valueToStore = null;
// }
// else {
// valueToStore = new Binary(value);
// }
// _$wrapper.<PropertyName> = valueToStore;
// }
// }
private static void EmitClrProperty(TypeBuilder typeBuilder, FieldInfo wrapperField, PropertyDescriptor pd, PropertyInfo pi, string name)
{
Type propertyType = SerializationUtility.GetClientType(pi.PropertyType);
PropertyBuilder propertyBuilder = typeBuilder.DefineProperty(name, PropertyAttributes.None, propertyType, null);
CustomAttributeBuilder dataMemberAtt = DataContractSurrogateGenerator.GetDataMemberAttributeBuilder(
pd.Attributes.OfType <DataMemberAttribute>().FirstOrDefault());
propertyBuilder.SetCustomAttribute(dataMemberAtt);
// get {
// return ((Entity)$wrapper).Property;
// }
MethodBuilder getPropertyMethodBuilder = typeBuilder.DefineMethod("get_" + name, MethodAttributes.Public, propertyType, Type.EmptyTypes);
ILGenerator generator = getPropertyMethodBuilder.GetILGenerator();
// Push the wrapper object onto the stack.
generator.Emit(OpCodes.Ldarg_0);
generator.Emit(OpCodes.Ldfld, wrapperField);
generator.Emit(OpCodes.Castclass, pi.DeclaringType);
// Call the property getter.
generator.Emit(OpCodes.Callvirt, pi.GetGetMethod());
// Deal with client-server type conversions.
if (propertyType != pi.PropertyType)
{
EmitToClientConversion(generator, pi.PropertyType, propertyType);
}
generator.Emit(OpCodes.Ret);
propertyBuilder.SetGetMethod(getPropertyMethodBuilder);
MethodBuilder setPropertyMethodBuilder = typeBuilder.DefineMethod("set_" + name, MethodAttributes.Public, null, new Type[] { propertyType });
generator = setPropertyMethodBuilder.GetILGenerator();
Label returnLabel = generator.DefineLabel();
// Data members require a getter and setter. However, if the real property is read-only, make sure
// our surrogate property setter is a no-op.
MethodInfo setMethod = pi.GetSetMethod();
if (setMethod != null && setMethod.IsPublic)
{
// NOTE: We don't ever set null values, because a property may be required. For
// original objects however it's possible that required properties are not
// roundtripped, as they may not have RoundtripOriginalAttribute.
// set {
// if (value != null) {
// _$wrapper.Property = value;
// }
// }
// If the value is null, return.
if (!propertyType.IsValueType)
{
generator.Emit(OpCodes.Ldarg_1);
EmitBranchIfNull(generator, propertyType, returnLabel);
}
else if (TypeUtility.IsNullableType(propertyType))
{
generator.Emit(OpCodes.Ldarga_S, 1);
EmitBranchIfNull(generator, propertyType, returnLabel);
}
// Push the wrapper object onto the stack.
generator.Emit(OpCodes.Ldarg_0);
generator.Emit(OpCodes.Ldfld, wrapperField);
generator.Emit(OpCodes.Castclass, pi.DeclaringType);
// Push the value onto the stack.
generator.Emit(OpCodes.Ldarg_1);
// Deal with client-server type conversions.
if (propertyType != pi.PropertyType)
{
EmitToServerConversion(generator, propertyType, pi.PropertyType);
}
// Call the property setter.
generator.Emit(OpCodes.Callvirt, setMethod);
}
generator.MarkLabel(returnLabel);
generator.Emit(OpCodes.Ret);
propertyBuilder.SetSetMethod(setPropertyMethodBuilder);
}
// Emit a surrogate property for a virtual property (a property that doesn't exist on the physical CLR type).
// The PropertyDescriptor for each virtual property is initialized in the type initializer of a surrogate type.
// The surrogate code we'll generate will look like this:
// public <PropertyType> <PropertyName> {
// get {
// // For reference types.
// return (<PropertyType>)$<PropertyName>.GetValue(_$wrapper);
//
// // For value types.
// object value = $<PropertyName>.GetValue(_$wrapper);
// if (value == null) {
// return default(value);
// }
// return (<PropertyType>)value;
//
// // For Binary.
// Binary value = (Binary)$<PropertyName>.GetValue(_$wrapper);
// if (value == null) {
// return null;
// }
// return value.ToArray();
// }
// set {
// if (value == null) {
// return;
// }
//
// // For normal types.
// $<PropertyName>.SetValue(_$wrapper, value);
//
// // For value types.
// $<PropertyName>.SetValue(_$wrapper, (object)value);
//
// // For Binary.
// Binary valueToStore;
// if (value == null) {
// valueToStore = null;
// }
// else {
// valueToStore = new Binary(value);
// }
// $<PropertyName>.SetValue(_$wrapper, valueToStore);
// }
// }
private static void EmitAttachedProperty(TypeBuilder typeBuilder, FieldInfo wrapperField, Lazy <ILGenerator> typeInitializerFactory, PropertyDescriptor pd, string name)
{
// private static PropertyDescriptor $property;
FieldBuilder propertyDescFieldBuilder = typeBuilder.DefineField("$" + name, typeof(PropertyDescriptor), FieldAttributes.Private | FieldAttributes.Static);
EmitPropertyInitializer(propertyDescFieldBuilder, typeInitializerFactory, name);
Type propertyType = SerializationUtility.GetClientType(pd.PropertyType);
PropertyBuilder propertyBuilder = typeBuilder.DefineProperty(name, PropertyAttributes.None, propertyType, null);
CustomAttributeBuilder dataMemberAtt = DataContractSurrogateGenerator.GetDataMemberAttributeBuilder(
pd.Attributes[typeof(DataMemberAttribute)] as DataMemberAttribute);
propertyBuilder.SetCustomAttribute(dataMemberAtt);
// get {
// return $property.GetValue(_$wrapper);
// }
MethodBuilder getPropertyMethodBuilder = typeBuilder.DefineMethod("get_" + name, MethodAttributes.Public, propertyType, Type.EmptyTypes);
ILGenerator generator = getPropertyMethodBuilder.GetILGenerator();
// Get the PropertyDescriptor.
generator.Emit(OpCodes.Ldsfld, propertyDescFieldBuilder);
// Push the wrapper object onto the stack. We'll use it as an argument for our
// call to GetValue later on.
generator.Emit(OpCodes.Ldarg_0);
generator.Emit(OpCodes.Ldfld, wrapperField);
// PropertyDescriptor.GetValue(_$wrapper).
generator.Emit(OpCodes.Callvirt, typeof(PropertyDescriptor).GetMethod("GetValue"));
// Unbox/cast.
DynamicMethodUtility.EmitFromObjectConversion(generator, pd.PropertyType);
// Deal with client-server type conversions.
if (propertyType != pd.PropertyType)
{
EmitToClientConversion(generator, pd.PropertyType, propertyType);
}
generator.Emit(OpCodes.Ret);
propertyBuilder.SetGetMethod(getPropertyMethodBuilder);
MethodBuilder setPropertyMethodBuilder = typeBuilder.DefineMethod("set_" + name, MethodAttributes.Public, null, new Type[] { propertyType });
generator = setPropertyMethodBuilder.GetILGenerator();
Label returnLabel = generator.DefineLabel();
// Data members require a getter and setter. However, if the real property is read-only, make sure
// our surrogate property setter is a no-op.
if (!pd.IsReadOnly)
{
// NOTE: We don't ever set null values, because a property may be required. For
// original objects however it's possible that required properties are not
// roundtripped, as they may not have RoundtripOriginalAttribute.
// set {
// if (value != null) {
// $property.SetValue(_$wrapper, value);
// }
// }
// If the value is null, return.
if (!propertyType.IsValueType)
{
generator.Emit(OpCodes.Ldarg_1);
EmitBranchIfNull(generator, propertyType, returnLabel);
}
else if (TypeUtility.IsNullableType(propertyType))
{
generator.Emit(OpCodes.Ldarga_S, 1);
EmitBranchIfNull(generator, propertyType, returnLabel);
}
// Get the PropertyDescriptor.
generator.Emit(OpCodes.Ldsfld, propertyDescFieldBuilder);
// Push the wrapper object onto the stack. We'll use it as an argument for our
// call to SetValue later on.
generator.Emit(OpCodes.Ldarg_0);
generator.Emit(OpCodes.Ldfld, wrapperField);
// Push the value onto the stack. We'll use it as the 2nd argument for
// our call to SetValue.
generator.Emit(OpCodes.Ldarg_1);
// Deal with client-server type conversions.
if (propertyType != pd.PropertyType)
{
EmitToServerConversion(generator, propertyType, pd.PropertyType);
}
// Box value types.
DynamicMethodUtility.EmitToObjectConversion(generator, pd.PropertyType);
// PropertyDescriptor.SetValue(_$wrapper, value).
generator.Emit(OpCodes.Callvirt, typeof(PropertyDescriptor).GetMethod("SetValue"));
}
generator.MarkLabel(returnLabel);
generator.Emit(OpCodes.Ret);
propertyBuilder.SetSetMethod(setPropertyMethodBuilder);
}
private static Type CreateSurrogateType(HashSet <Type> knownExposedTypes, Type type)
{
CustomAttributeBuilder dataContractAttBuilder = DataContractSurrogateGenerator.GetDataContractAttributeBuilder(type);
// Emit a dynamic type.
TypeAttributes typeAttributes = TypeAttributes.Public;
if (type.IsSealed)
{
typeAttributes |= TypeAttributes.Sealed;
}
TypeBuilder typeBuilder = DataContractSurrogateGenerator.moduleBuilder.DefineType(type.FullName, typeAttributes);
if (dataContractAttBuilder != null)
{
typeBuilder.SetCustomAttribute(dataContractAttBuilder);
}
// Attach a [SecuritySafeCritical] to the surrogate type to permit its setters to deal with
// types that may be SafeCritical or Critical
// If the AppDomain is running in medium trust, this attribute won't have any effect.
CustomAttributeBuilder safeCriticalAttrBuilder = new CustomAttributeBuilder(
typeof(SecuritySafeCriticalAttribute).GetConstructor(Type.EmptyTypes),
new object[0]);
typeBuilder.SetCustomAttribute(safeCriticalAttrBuilder);
Type actualParentType;
Type parentSurrogateType = DataContractSurrogateGenerator.GetSurrogateType(knownExposedTypes, type.BaseType);
if (parentSurrogateType != null)
{
// Figure out what the actual parent of the exposed type is.
actualParentType = type.BaseType;
while (actualParentType != typeof(object))
{
if (knownExposedTypes.Contains(actualParentType))
{
break;
}
actualParentType = actualParentType.BaseType;
}
typeBuilder.SetParent(parentSurrogateType);
}
else
{
parentSurrogateType = typeof(object);
actualParentType = typeof(object);
}
FieldInfo wrapperField = EmitICloneableImplementation(typeBuilder, type, parentSurrogateType);
EmitConstructorsAndProperties(typeBuilder, type, parentSurrogateType, actualParentType, wrapperField);
EmitOnDeserializingMethod(typeBuilder, type, wrapperField);
EmitContractNamespaceAttributes(type);
return(typeBuilder.CreateType());
}
