private Func <DisplayContext, Task <IHtmlContent> > CreateDelegate(
ShapeAttributeOccurrence attributeOccurrence,
ShapeDescriptor descriptor)
{
return(context =>
{
var serviceInstance = context.ServiceProvider.GetService(attributeOccurrence.ServiceType);
// oversimplification for the sake of evolving
return PerformInvokeAsync(context, attributeOccurrence.MethodInfo, serviceInstance);
});
}
private Func <DisplayContext, Task <IHtmlContent> > CreateDelegate(ShapeAttributeOccurrence attributeOccurrence)
{
var type = attributeOccurrence.ServiceType;
var methodInfo = attributeOccurrence.MethodInfo;
var parameters = methodInfo.GetParameters();
// Create an array of lambdas that will generate the value of each parameter. This prevents from having to test each name and type on every invocation.
var argumentBuilders = parameters.Select(parameter => BindParameter(parameter)).ToArray();
var methodWrapper = CreateMethodWrapper(type, methodInfo);
Func <object, DisplayContext, Task <IHtmlContent> > action;
if (methodInfo.ReturnType == typeof(Task <IHtmlContent>))
{
action = (s, d) =>
{
var arguments = new object[argumentBuilders.Length];
for (var i = 0; i < arguments.Length; i++)
{
arguments[i] = argumentBuilders[i](d);
}
return((Task <IHtmlContent>)methodWrapper(s, arguments));
};
}
else if (attributeOccurrence.MethodInfo.ReturnType == typeof(IHtmlContent))
{
action = (s, d) =>
{
var arguments = new object[argumentBuilders.Length];
for (var i = 0; i < arguments.Length; i++)
{
arguments[i] = argumentBuilders[i](d);
}
return(Task.FromResult((IHtmlContent)methodWrapper(s, arguments)));
};
}
else if (attributeOccurrence.MethodInfo.ReturnType != typeof(void))
{
action = (s, d) =>
{
var arguments = new object[argumentBuilders.Length];
for (var i = 0; i < arguments.Length; i++)
{
arguments[i] = argumentBuilders[i](d);
}
return(Task.FromResult(CoerceHtmlContent(methodWrapper(s, arguments))));
};
}
else
{
action = (s, d) => null;
}
return(context =>
{
var serviceInstance = context.ServiceProvider.GetService(attributeOccurrence.ServiceType);
return action(serviceInstance, context);
});
}
