Call Web API with multiple parameters - asp.net-core

Question

WebAPI
public ActionResult Save([FromBody] string SaveId, List<Product> Products, List<Category> Categories)
{
}
How to call this web API ActionMethod from Controller Action Method?
asp.net Core MVC
public IActionResult SaveConfirmedDocument()
{
var Body = new {
documentID,
Products,
Categories
};
var client = new RestClient(Url);
client.Timeout = -1;
var request = new RestRequest(Method.POST);
request.AddHeader("Content-Type", "application/json");
request.AddHeader("Authorization", "Bearer " + Authorization);
request.AddParameter("application/json", Body, ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
}

Answer 1

How to call this web API ActionMethod from Controller Action Method?
Please note that once the request stream is read by an input formatter, it's no longer available to be read again.
For more information, please check the [FromBody] attribute that can not be applied to more than one parameter per action method.
In your action method, you applied [FromBody] attribute to the first parameter, to pass and bind data to List<Product> Products and List<Category> Categories parameters, you can make request with data, like below.
var client = new RestClient(Url);
client.Timeout = -1;
var request = new RestRequest(Method.POST);
request.AddHeader("Content-Type", "application/json");
request.AddHeader("Authorization", "Bearer " + Authorization);
//to make the data can be bound to action parameters well
//please generate query string data based on your actual model class and properties, like below
request.AddParameter("Products[0].Id", 1, ParameterType.QueryString);
request.AddParameter("Products[0].Name", "PName1", ParameterType.QueryString);
request.AddParameter("Products[1].Id", 2, ParameterType.QueryString);
request.AddParameter("Products[1].Name", "PName2", ParameterType.QueryString);
request.AddParameter("Categories[0].Id", 1, ParameterType.QueryString);
request.AddParameter("Categories[0].Name", "CategoryName1", ParameterType.QueryString);
request.AddParameter("Categories[1].Id", 2, ParameterType.QueryString);
request.AddParameter("Categories[1].Name", "CategoryName2", ParameterType.QueryString);
request.AddJsonBody(Body);
IRestResponse response = client.Execute(request);
Test Result
Besides, if you'd like to pass both of these data through request body, you can try to modify the code like below.
Action method
public ActionResult Save([FromBody] ProductCategoryViewModel productsAndCategories)
{
//...
Model class
public class ProductCategoryViewModel
{
public string SaveId { get; set; }
public List<Product> Products { get; set; }
public List<Category> Categories { get; set; }
}
Code of making request(s) with test data
var Body = new {
SaveId = "123",
Products = new List<Product> {
new Product {
Id = 1,
Name = "PName1"
},
new Product {
Id = 2,
Name = "PName2"
},
new Product {
Id = 3,
Name = "PName3"
}
},
Categories = new List<Category>
{
new Category
{
Id = 1,
Name = "CategoryName1"
}
}
};
var client = new RestClient(Url);
client.Timeout = -1;
var request = new RestRequest(Method.POST);
request.AddHeader("Content-Type", "application/json");
request.AddHeader("Authorization", "Bearer " + Authorization);
request.AddJsonBody(Body);
IRestResponse response = client.Execute(request);

Answer 2

Just create new class like this:
public class MyViewModel
{
public string SaveId {get; set;}
public List<Product> Products {get; set;}
public List<Category> Categories {get; set;}
}
And change your action to this:
public ActionResult Save(MyViewModel viewModel)
{
}
Just select what do you prefer - DocumentId or SaveId. It should be the same in the both places.