// 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;
}
}
// 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);
}
