Web api passing array of integers to action method

Question

I have this web api method:

[HttpGet]
[Route(\"WorkPlanList/{clientsId}/{date:datetime}\")]
public async Task

        

Answer 1

You get 0 on clientsId because the framework is unable to bind the value 4,5 in your example to a List. In this case you use a custom model binder that will parse the value into the type you want and bind it to your action parameter:

[RoutePrefix("blabla/api/workplan")]
public class WorkPlanController : ApiController {

    [HttpGet]
    [Route("WorkPlanList/{clientsId}/{date:datetime}")]
    public IHttpActionResult WorkPlanList([ModelBinder(typeof(ClientsIdBinder))]List clientsId, [FromUri]DateTime date) {

        var result = new { clientsId, date };

        return (Ok(result));
    }
}

public class ClientsIdBinder : IModelBinder {

    public bool BindModel(System.Web.Http.Controllers.HttpActionContext actionContext, ModelBindingContext bindingContext) {
        if (!typeof(IEnumerable).IsAssignableFrom(bindingContext.ModelType)) {
            return false;
        }

        var val = bindingContext.ValueProvider.GetValue(bindingContext.ModelName);
        if (val == null) {
            return false;
        }

        var ids = val.RawValue as string;
        if (ids == null) {
            return false;
        }

        var tokens = ids.Split(new[] { ',' }, StringSplitOptions.RemoveEmptyEntries);
        if (tokens.Length > 0) {
            var clientsId = tokens.Select(s => int.Parse(s));
            if (bindingContext.ModelType.IsArray) {
                bindingContext.Model = clientsId.ToArray();
            } else {
                bindingContext.Model = clientsId.ToList();
             }
            return true;
        }

        bindingContext.ModelState.AddModelError(
            bindingContext.ModelName, "Cannot convert client ids");
        return false;
    }
}

Reference: Parameter Binding in ASP.NET Web API