public static Type CreateClassProxy(Type serviceType, Type implementType)
{
if (null == serviceType)
{
throw new ArgumentNullException(nameof(serviceType));
}
if (null == implementType)
{
implementType = serviceType;
}
if (serviceType.IsSealed || implementType.IsSealed)
{
throw new InvalidOperationException("the class type is sealed");
}
//
var proxyTypeName = _proxyTypeNameResolver(serviceType, implementType);
if (_proxyTypes.TryGetValue(proxyTypeName, out var proxyType))
{
return(proxyType);
}
lock (_typeLock)
{
if (_proxyTypes.TryGetValue(proxyTypeName, out proxyType))
{
return(proxyType);
}
var typeBuilder = _moduleBuilder.DefineType(proxyTypeName, TypeAttributes.Public | TypeAttributes.Sealed | TypeAttributes.Class, implementType, Type.EmptyTypes);
GenericParameterUtils.DefineGenericParameter(implementType, typeBuilder);
var targetField = typeBuilder.DefineField(TargetFieldName, implementType, FieldAttributes.Private);
// constructors
var constructors = implementType.GetConstructors();
if (constructors.Length > 0)
{
foreach (var constructor in constructors)
{
var constructorTypes = constructor.GetParameters().Select(o => o.ParameterType).ToArray();
var constructorBuilder = typeBuilder.DefineConstructor(
constructor.Attributes,
constructor.CallingConvention,
constructorTypes);
foreach (var customAttribute in constructor.CustomAttributes)
{
constructorBuilder.SetCustomAttribute(DefineCustomAttribute(customAttribute));
}
var il = constructorBuilder.GetILGenerator();
il.EmitThis();
for (var i = 0; i < constructorTypes.Length; i++)
{
il.Emit(OpCodes.Ldarg, i + 1);
}
il.Call(constructor);
il.Emit(OpCodes.Nop);
il.EmitThis();
il.EmitThis();
il.Emit(OpCodes.Stfld, targetField);
il.Emit(OpCodes.Ret);
}
}
else
{
var constructorBuilder = typeBuilder.DefineConstructor(MethodAttributes.Public, CallingConventions.HasThis, Type.EmptyTypes);
var il = constructorBuilder.GetILGenerator();
il.EmitThis();
il.EmitThis();
il.Emit(OpCodes.Stfld, targetField);
il.Emit(OpCodes.Ret);
}
// properties
var propertyMethods = new HashSet <string>();
foreach (var property in serviceType.GetProperties(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance))
{
if (property.IsVisibleAndVirtual())
{
var propertyBuilder = typeBuilder.DefineProperty(property.Name, property.Attributes, property.PropertyType, Type.EmptyTypes);
//inherit targetMethod's attribute
foreach (var customAttributeData in property.CustomAttributes)
{
propertyBuilder.SetCustomAttribute(DefineCustomAttribute(customAttributeData));
}
if (property.CanRead)
{
propertyMethods.Add(property.GetMethod.Name);
var method = MethodUtils.DefineClassMethod(typeBuilder, property.GetMethod, targetField);
propertyBuilder.SetGetMethod(method);
}
if (property.CanWrite)
{
propertyMethods.Add(property.SetMethod.Name);
var method = MethodUtils.DefineClassMethod(typeBuilder, property.SetMethod, targetField);
propertyBuilder.SetSetMethod(method);
}
}
}
// methods
var methods = serviceType.GetMethods(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance)
.Where(m => m.IsVirtual && !m.IsFinal && m.IsVisible() && !propertyMethods.Contains(m.Name) && !_ignoredMethods.Contains(m.Name))
.ToArray();
foreach (var method in methods)
{
MethodUtils.DefineClassMethod(typeBuilder, method, targetField);
}
proxyType = typeBuilder.CreateType();
_proxyTypes[proxyTypeName] = proxyType;
return(proxyType);
}
}
