private static HubMethodExecutor WrapVoidAction(VoidHubMethodExecutor executor)
{
return(delegate(IHub hub, object[] parameters)
{
executor(hub, parameters);
return null;
});
}
private static HubMethodExecutor WrapVoidAction(VoidHubMethodExecutor executor)
{
return delegate(IHub hub, object[] parameters)
{
executor(hub, parameters);
return null;
};
}
private static HubMethodExecutor GetExecutor(MethodInfo methodInfo)
{
// Parameters to executor
ParameterExpression hubParameter = Expression.Parameter(typeof(IHub), "hub");
ParameterExpression parametersParameter = Expression.Parameter(typeof(object[]), "parameters");
// Build parameter list
List <Expression> parameters = new List <Expression>();
ParameterInfo[] paramInfos = methodInfo.GetParameters();
for (int i = 0; i < paramInfos.Length; i++)
{
ParameterInfo paramInfo = paramInfos[i];
BinaryExpression valueObj = Expression.ArrayIndex(parametersParameter, Expression.Constant(i));
UnaryExpression valueCast = Expression.Convert(valueObj, paramInfo.ParameterType);
// valueCast is "(Ti) parameters[i]"
parameters.Add(valueCast);
}
// TODO: CORECLR reflected type?
#if DNX451
// Call method
UnaryExpression instanceCast = (!methodInfo.IsStatic) ? Expression.Convert(hubParameter, methodInfo.ReflectedType) : null;
#else
UnaryExpression instanceCast = (!methodInfo.IsStatic) ? Expression.Convert(hubParameter, methodInfo.DeclaringType) : null;
#endif
MethodCallExpression methodCall = Expression.Call(instanceCast, methodInfo, parameters);
// methodCall is "((TController) hub) method((T0) parameters[0], (T1) parameters[1], ...)"
// Create function
if (methodCall.Type == typeof(void))
{
Expression <VoidHubMethodExecutor> lambda = Expression.Lambda <VoidHubMethodExecutor>(methodCall, hubParameter, parametersParameter);
VoidHubMethodExecutor voidExecutor = lambda.Compile();
return(WrapVoidAction(voidExecutor));
}
else
{
// must coerce methodCall to match HubMethodExecutor signature
UnaryExpression castMethodCall = Expression.Convert(methodCall, typeof(object));
Expression <HubMethodExecutor> lambda = Expression.Lambda <HubMethodExecutor>(castMethodCall, hubParameter, parametersParameter);
return(lambda.Compile());
}
}
