/// <summary>
/// Create an advice that runs after the advised method only if it completes successfully.
/// </summary>
/// <param name="reflection">Reflection</param>
/// <param name="advice">Delegate used to emit code to be invoked after the advised method</param>
/// <returns>Advice</returns>
static public IAdvice Returning(this Advisor.Reflection.IAfter reflection, Action <ILGenerator> advice)
{
return(new Advice((_Method, _Pointer) =>
{
var _type = _Method.Type();
var _signature = _Method.Signature();
var _method = new DynamicMethod(string.Empty, _type, _signature, _Method.DeclaringType, true);
var _body = _method.GetILGenerator();
_body.Emit(_signature, false);
_body.Emit(_Pointer, _type, _signature);
_body.Emit(advice);
_body.Emit(OpCodes.Ret);
_method.Prepare();
return _method;
}));
}
/// <summary>
/// Create an advice that runs after the advised method only if it exits by throwing an exception.
/// </summary>
/// <param name="reflection">Reflection</param>
/// <param name="advice">Delegate used to emit code to be invoked after the advised method</param>
/// <returns>Advice</returns>
static public IAdvice Throwing(this Advisor.Reflection.IAfter reflection, Action <ILGenerator> advice)
{
return(new Advice((_Method, _Pointer) =>
{
var _type = _Method.ReturnType;
var _signature = _Method.Signature();
var _method = new DynamicMethod(string.Empty, _type, _signature, _Method.DeclaringType, true);
var _body = _method.GetILGenerator();
if (_type == Metadata.Void)
{
_body.BeginExceptionBlock();
_body.Emit(_signature, false);
_body.Emit(_Pointer, _Method.ReturnType, _signature);
_body.BeginCatchBlock(Metadata <Exception> .Type);
_body.Emit(advice);
_body.Emit(OpCodes.Rethrow);
_body.EndExceptionBlock();
}
else
{
_body.DeclareLocal(_type);
_body.BeginExceptionBlock();
_body.Emit(_signature, false);
_body.Emit(_Pointer, _Method.ReturnType, _signature);
_body.Emit(OpCodes.Stloc_0);
_body.BeginCatchBlock(Metadata <Exception> .Type);
_body.Emit(advice);
_body.Emit(OpCodes.Rethrow);
_body.EndExceptionBlock();
_body.Emit(OpCodes.Ldloc_0);
}
_body.Emit(OpCodes.Ret);
_method.Prepare();
return _method;
}));
}
