private static Func <object, CancellationToken, Task <object> > CreateInvocationDelegate <T>(
MethodInfo serviceMethod, ServiceMethodInvocationContext context)
{
ParameterExpression request = Expression.Parameter(typeof(object), "request");
ParameterExpression cancel = Expression.Parameter(typeof(CancellationToken), "cancel");
Func <object, CancellationToken, Task <T> > lambda = Expression.Lambda <Func <object, CancellationToken, Task <T> > >(
serviceMethod.NumberOfParameters() == 1?
AsyncServiceMethodCall.CreateCallExpression(serviceMethod, context, request):
AsyncServiceMethodCall.CreateCallExpression(serviceMethod, context, request, cancel),
request,
cancel).Compile();
return(async(r, c) => await lambda(r, c));
}
public Delegate CreateInvocationDelegate(MethodInfo serviceMethod, ServiceMethodInvocationContext context)
{
if (!this.CanCreateInvocationDelegateFor(serviceMethod))
{
throw new ArgumentException(
"Method " + serviceMethod + " should have a single parameter, be marked as async or return a Task, and should not be static",
"serviceMethod");
}
ParameterExpression request = Expression.Parameter(typeof(object), "request");
ParameterExpression cancel = Expression.Parameter(typeof(CancellationToken), "cancel");
Action <object, CancellationToken> lambda = Expression.Lambda <Action <object, CancellationToken> >(
serviceMethod.NumberOfParameters() == 1?
AsyncServiceMethodCall.CreateCallExpression(serviceMethod, context, request):
AsyncServiceMethodCall.CreateCallExpression(serviceMethod, context, request, cancel),
request,
cancel).Compile();
return(new Func <object, CancellationToken, Task <object> >((r, c) =>
{
lambda(r, c);
return TaskEx.FromResult(context.DefaultResponse);
}));
}
