Identify the all the action methods in a WebAPI application

Question

Is it possible to list all the action methods along with return types and parameters, of a WebApi application.

I saw a similar question and asnwered as well, but were for MVC (Getting All Controllers and Actions names in C#). But I tried to do some changes to in webapi, but couldnt do it.

Answer 1

Below code will get you all required information.

var controlleractionlist = asm.GetTypes()
                .Where(type => typeof(ApiController).IsAssignableFrom(type))
                .SelectMany(type => type.GetMethods(BindingFlags.Instance | BindingFlags.DeclaredOnly | BindingFlags.Public))
                .Where(m => !m.GetCustomAttributes(typeof(System.Runtime.CompilerServices.CompilerGeneratedAttribute), true).Any())
                .Select(x => new { Controller = x.DeclaringType.Name, Action = x.Name, 
                            ReturnType = x.ReturnType.Name, 
                    Attributes = String.Join(",", x.GetCustomAttributes().Select(a => a.GetType().Name.Replace("Attribute", ""))), 
                    ControllerRouteAttr = ((System.Web.Http.RoutePrefixAttribute)Attribute.GetCustomAttribute(x.DeclaringType, typeof(System.Web.Http.RoutePrefixAttribute)))?.Prefix,
                    MethodRouteAttr = ((System.Web.Http.RouteAttribute)Attribute.GetCustomAttribute(x, typeof(System.Web.Http.RouteAttribute)))?.Template,
                    params1 = String.Join(",", x.GetParameters().Select(a => a.Name)),
                    returnType = String.Join(",", x.GetParameters().Select(a => a.Name.GetType()))
                })
                .OrderBy(x => x.Controller).ThenBy(x => x.Action).ToList();