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copied!<p>I'd much rather use a custom ApiControllerActionSelector.</p> <pre><code>public class MyActionSelector : ApiControllerActionSelector { public override HttpActionDescriptor SelectAction( HttpControllerContext context) { HttpMessageContent requestContent = new HttpMessageContent( context.Request); var json = requestContent.HttpRequestMessage.Content .ReadAsStringAsync().Result; string type = (string)JObject.Parse(json)["type"]; var actionMethod = context.ControllerDescriptor.ControllerType .GetMethods(BindingFlags.Instance | BindingFlags.Public) .FirstOrDefault(m => m.Name == "Create" + type); if (actionMethod != null) { return new ReflectedHttpActionDescriptor( context.ControllerDescriptor, actionMethod); } return base.SelectAction(context); } } </code></pre> <p>Here is the model. I gave it a weird name of Abc.</p> <pre><code>public class Abc { public string Type { get; set; } public string Type1Data { get; set; } } </code></pre> <p>Here is the action method.</p> <pre><code>public void Createtype1(Abc a) { } </code></pre> <p>Finally, plug-in the action selector.</p> <pre><code>public static class WebApiConfig { public static void Register(HttpConfiguration config) { config.Routes.MapHttpRoute( name: "DefaultApi", routeTemplate: "api/{controller}/{id}", defaults: new { id = RouteParameter.Optional } ); config.Services.Replace(typeof(IHttpActionSelector), new MyActionSelector()); } } </code></pre> <p>If you now POST to http://localhost:port/api/yourapicontroller, depending on the value in type field in JSON, the action method Create* will be selected.</p>

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