private static void FindNextProperty(PropertyInfo property, IList<PropertyInfo> collection, bool getter)
{
DebugCheck.NotNull(property);
DebugCheck.NotNull(collection);
var method = getter ? property.Getter() : property.Setter();
if (method != null)
{
var nextType = method.DeclaringType.BaseType();
if (nextType != null && nextType != typeof(object))
{
var baseMethod = method.GetBaseDefinition();
var nextProperty =
(from p in nextType.GetInstanceProperties()
let candidateMethod = getter ? p.Getter() : p.Setter()
where candidateMethod != null && candidateMethod.GetBaseDefinition() == baseMethod
select p).FirstOrDefault();
if (nextProperty != null)
{
collection.Add(nextProperty);
CollectProperties(nextProperty, collection);
}
}
}
}
public bool EmitMember(
TypeBuilder typeBuilder, EdmMember member, PropertyBuilder propertyBuilder, PropertyInfo baseProperty,
BaseProxyImplementor baseImplementor)
{
if (_members.Contains(member))
{
var baseGetter = baseProperty.Getter();
const MethodAttributes getterAttributes =
MethodAttributes.HideBySig | MethodAttributes.SpecialName | MethodAttributes.Virtual;
var getterAccess = baseGetter.Attributes & MethodAttributes.MemberAccessMask;
// Define field to store interceptor Func
// Signature of interceptor Func delegate is as follows:
//
// bool intercept(ProxyType proxy, PropertyType propertyValue)
//
// where
// PropertyType is the type of the Property, such as ICollection<Customer>,
// ProxyType is the type of the proxy object,
// propertyValue is the value returned from the proxied type's property getter.
var interceptorType = typeof(Func<,,>).MakeGenericType(typeBuilder, baseProperty.PropertyType, typeof(bool));
var interceptorInvoke = TypeBuilder.GetMethod(interceptorType, typeof(Func<,,>).GetOnlyDeclaredMethod("Invoke"));
var interceptorField = typeBuilder.DefineField(
GetInterceptorFieldName(baseProperty.Name), interceptorType, FieldAttributes.Private | FieldAttributes.Static);
// Define a property getter override in the proxy type
var getterBuilder = typeBuilder.DefineMethod(
"get_" + baseProperty.Name, getterAccess | getterAttributes, baseProperty.PropertyType, Type.EmptyTypes);
var generator = getterBuilder.GetILGenerator();
// Emit instructions for the following call:
// T value = base.SomeProperty;
// if(this._interceptorForSomeProperty(this, value))
// { return value; }
// return base.SomeProperty;
// where _interceptorForSomeProperty represents the interceptor Func field.
var lableTrue = generator.DefineLabel();
generator.DeclareLocal(baseProperty.PropertyType); // T value
generator.Emit(OpCodes.Ldarg_0); // call base.SomeProperty
generator.Emit(OpCodes.Call, baseGetter); // call to base property getter
generator.Emit(OpCodes.Stloc_0); // value = result
generator.Emit(OpCodes.Ldarg_0); // load this
generator.Emit(OpCodes.Ldfld, interceptorField); // load this._interceptor
generator.Emit(OpCodes.Ldarg_0); // load this
generator.Emit(OpCodes.Ldloc_0); // load value
generator.Emit(OpCodes.Callvirt, interceptorInvoke); // call to interceptor delegate with (this, value)
generator.Emit(OpCodes.Brtrue_S, lableTrue); // if true, just return
generator.Emit(OpCodes.Ldarg_0); // else, call the base propertty getter again
generator.Emit(OpCodes.Call, baseGetter); // call to base property getter
generator.Emit(OpCodes.Ret);
generator.MarkLabel(lableTrue);
generator.Emit(OpCodes.Ldloc_0);
generator.Emit(OpCodes.Ret);
propertyBuilder.SetGetMethod(getterBuilder);
baseImplementor.AddBasePropertyGetter(baseProperty);
return true;
}
return false;
}
internal static bool CanProxyGetter(PropertyInfo clrProperty)
{
DebugCheck.NotNull(clrProperty);
return CanProxyMethod(clrProperty.Getter());
}
private static void EmitBaseGetter(TypeBuilder typeBuilder, PropertyBuilder propertyBuilder, PropertyInfo baseProperty)
{
if (CanProxyGetter(baseProperty))
{
var baseGetter = baseProperty.Getter();
const MethodAttributes getterAttributes =
MethodAttributes.HideBySig | MethodAttributes.SpecialName | MethodAttributes.Virtual;
var getterAccess = baseGetter.Attributes & MethodAttributes.MemberAccessMask;
// Define a property getter override in the proxy type
var getterBuilder = typeBuilder.DefineMethod(
"get_" + baseProperty.Name, getterAccess | getterAttributes, baseProperty.PropertyType, Type.EmptyTypes);
var gen = getterBuilder.GetILGenerator();
gen.Emit(OpCodes.Ldarg_0);
gen.Emit(OpCodes.Call, baseGetter);
gen.Emit(OpCodes.Ret);
propertyBuilder.SetGetMethod(getterBuilder);
}
}
private void EmitScalarSetter(TypeBuilder typeBuilder, PropertyBuilder propertyBuilder, PropertyInfo baseProperty, bool isKeyMember)
{
var baseSetter = baseProperty.Setter();
const MethodAttributes methodAttributes = MethodAttributes.HideBySig | MethodAttributes.SpecialName | MethodAttributes.Virtual;
var methodAccess = baseSetter.Attributes & MethodAttributes.MemberAccessMask;
var setterBuilder = typeBuilder.DefineMethod(
"set_" + baseProperty.Name, methodAccess | methodAttributes, null, new[] { baseProperty.PropertyType });
var generator = setterBuilder.GetILGenerator();
var endOfMethod = generator.DefineLabel();
// If the CLR property represents a key member of the Entity Type,
// ignore attempts to set the key value to the same value.
if (isKeyMember)
{
var baseGetter = baseProperty.Getter();
if (baseGetter != null)
{
// if (base.[Property] != value)
// {
// // perform set operation
// }
var propertyType = baseProperty.PropertyType;
if (propertyType == typeof(int)
|| propertyType == typeof(short)
|| propertyType == typeof(Int64)
|| propertyType == typeof(bool)
|| propertyType == typeof(byte)
|| propertyType == typeof(UInt32)
|| propertyType == typeof(UInt64)
|| propertyType == typeof(float)
|| propertyType == typeof(double)
|| propertyType.IsEnum())
{
generator.Emit(OpCodes.Ldarg_0);
generator.Emit(OpCodes.Call, baseGetter);
generator.Emit(OpCodes.Ldarg_1);
generator.Emit(OpCodes.Beq_S, endOfMethod);
}
else if (propertyType == typeof(byte[]))
{
// Byte arrays must be compared by value
generator.Emit(OpCodes.Ldsfld, _compareByteArraysField);
generator.Emit(OpCodes.Ldarg_0);
generator.Emit(OpCodes.Call, baseGetter);
generator.Emit(OpCodes.Ldarg_1);
generator.Emit(OpCodes.Callvirt, FuncInvokeMethod);
generator.Emit(OpCodes.Brtrue_S, endOfMethod);
}
else
{
// Get the specific type's inequality method if it exists
var op_inequality = propertyType.GetDeclaredMethod("op_Inequality", propertyType, propertyType);
if (op_inequality != null)
{
generator.Emit(OpCodes.Ldarg_0);
generator.Emit(OpCodes.Call, baseGetter);
generator.Emit(OpCodes.Ldarg_1);
generator.Emit(OpCodes.Call, op_inequality);
generator.Emit(OpCodes.Brfalse_S, endOfMethod);
}
else
{
// Use object inequality
generator.Emit(OpCodes.Ldarg_0);
generator.Emit(OpCodes.Call, baseGetter);
if (propertyType.IsValueType())
{
generator.Emit(OpCodes.Box, propertyType);
}
generator.Emit(OpCodes.Ldarg_1);
if (propertyType.IsValueType())
{
generator.Emit(OpCodes.Box, propertyType);
}
generator.Emit(OpCodes.Call, ObjectEqualsMethod);
generator.Emit(OpCodes.Brtrue_S, endOfMethod);
}
}
}
}
// Creates code like this:
//
// try
// {
// MemberChanging(propertyName);
// base.Property_set(value);
// MemberChanged(propertyName);
// }
// finally
// {
// _resetFKSetterFlagField(this);
// }
//
// Note that the try/finally ensures that even if an exception causes
// the setting of the property to be aborted, we still clear the flag that
// indicates that we are in a property setter.
generator.BeginExceptionBlock();
generator.Emit(OpCodes.Ldarg_0);
generator.Emit(OpCodes.Ldstr, baseProperty.Name);
generator.Emit(OpCodes.Call, _entityMemberChanging);
generator.Emit(OpCodes.Ldarg_0);
generator.Emit(OpCodes.Ldarg_1);
generator.Emit(OpCodes.Call, baseSetter);
generator.Emit(OpCodes.Ldarg_0);
generator.Emit(OpCodes.Ldstr, baseProperty.Name);
generator.Emit(OpCodes.Call, _entityMemberChanged);
generator.BeginFinallyBlock();
generator.Emit(OpCodes.Ldsfld, _resetFKSetterFlagField);
generator.Emit(OpCodes.Ldarg_0);
generator.Emit(OpCodes.Callvirt, InvokeMethod);
generator.EndExceptionBlock();
generator.MarkLabel(endOfMethod);
generator.Emit(OpCodes.Ret);
propertyBuilder.SetSetMethod(setterBuilder);
}