HttpClient pass multiple simple parameters - asp.net-mvc

Question

I'm trying to do a POST from one controller to another controller. Both controller's are from different projects. One project is serving to simulate the presentation layer (which I will call the test project here).
From the test project I'm trying to pass 2 simple string parameters to the other controller which I will call the process.
var values = new List<KeyValuePair<string, string>>();
values.Add(new KeyValuePair<string, string>("id", param.Id.Value));
values.Add(new KeyValuePair<string, string>("type", param.Type.Value));
var content = new FormUrlEncodedContent(values);
using (var client = new HttpClient())
{
client.BaseAddress = new Uri(url);
client.DefaultRequestHeaders.Clear();
client.DefaultRequestHeaders.AcceptLanguage.Add(new StringWithQualityHeaderValue("nl-NL"));
client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
string token = param.token.Value;
client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", token);
var response = client.PostAsync("/api/Process/Product", content).Result;
if (response.IsSuccessStatusCode)
{
var result = response.Content.ReadAsStringAsync().Result;
return Request.CreateResponse(HttpStatusCode.OK, result);
}
return Request.CreateErrorResponse(HttpStatusCode.BadRequest, "fail");
}
And in the process controller, I'm trying to receive it like this:
[HttpPost]
public HttpResponseMessage Product(string id, string type)
{
return null;
}
But it never reaches this controller. I always get a "not found status code".
So how can I pass 2 simple parameters with HttpClient()?

Answer 1

Use Get instead of Post for simple type parameters.
using (var client = new HttpClient())
{
BaseAddress = new Uri(url);
client.BaseAddress = new Uri(url);
client.DefaultRequestHeaders.Clear();
client.DefaultRequestHeaders.AcceptLanguage.Add(new StringWithQualityHeaderValue("nl-NL"));
client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
string token = param.token.Value;
client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", token);
// New code:
var response = await client.GetAsync( string.format("api/products/id={0}&type={1}",param.Id.Value,param.Id.Type) ).Result;
if (response.IsSuccessStatusCode)
{
var result = response.Content.ReadAsStringAsync().Result;
return Request.CreateResponse(HttpStatusCode.OK, result);
}
return Request.CreateErrorResponse(HttpStatusCode.BadRequest, "fail");
}
In the API side you can do like this.
[HttpGet]
public HttpResponseMessage Product(string id, string type)
{
return null;
}

Answer 2

When receiving a post you must specify [FromBody] in the parameters for the method to be called
[HttpPost]
public HttpResponseMessage Product([FromBody]string id, [FromBody]string type)
{
return null;
}

Answer 3

I'm not sure I am totally in love with it, but I used anonymous types and dynamics to handle this in the past... (Note the config differences for using PostAsJsonAsync(). I forgot these initially.)
client.DefaultRequestHeaders.Accept.Clear();
client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
client.PostAsJsonAsync("api/User/UpdateLastLogin", new { UserId = userId, ApplicationId = applicationId });
Receiving controller:
[HttpPost]
public void UpdateLastLogin([FromBody]dynamic model)
{
_userRepository.UpdateLastLogin((int)model.UserId, (int)model.ApplicationId);
}
In WebApiConfig.Register():
var json = config.Formatters.JsonFormatter;
json.SerializerSettings.PreserveReferencesHandling = Newtonsoft.Json.PreserveReferencesHandling.Objects;
config.Formatters.Remove(config.Formatters.XmlFormatter);
The other approach, which I passed on, is to create a completely new set of strongly types models for every one of these calls. I didn't want to, as I had a ton of them to make to a WebAPI.

Answer 4

Here is another example you can use for WinForms, WPF or Console apps
Client code
async Task<CalendarView> GetData(int month, int year, int deviceTypeID)
{
var result = new MSOCommon.CalendarView();
try
{
HttpClient client = new HttpClient();
var calendarRequest = new CalendarRequest()
{
Month = month,
Year = year,
DeviceTypeID = deviceTypeID,
UserInfo = Program.UserInfo
};
var url = Properties.Settings.Default.ServerBaseUrl + string.Format("/api/calendar/Calendar");
HttpResponseMessage response = await client.PostAsync(url, calendarRequest.AsJson());
if (response.IsSuccessStatusCode) // Check the response StatusCode
{
var serSettings = new JsonSerializerSettings()
{
TypeNameHandling = TypeNameHandling.All
};
string responseBody = await response.Content.ReadAsStringAsync();
result = JsonConvert.DeserializeObject<MSOCommon.CalendarView>(responseBody, serSettings);
}
else
{
logger.Error(Properties.Resources.DATACannotGetCalendar);
}
}
catch (Exception ex)
{
logger.Error(Properties.Resources.DATACannotGetCalendar + " " + ex.Message);
logger.Error(ex);
}
return result;
}
Controller server-side code
[HttpPost()]
public CalendarView Calendar(CalendarRequest calendarRequest)
{
logger.Info(string.Format("Get calendar for month {0} and year {1} ", calendarRequest.Month, calendarRequest.Year));
// TODO Check username
var result = new CalendarView();
using (var db = new MSOnlineEntities())
{
result = db.Calendars.Include("CalendarDetails")
.Where(x => x.CMonth == calendarRequest.Month && x.CYear == calendarRequest.Year && x.CDeviceTypeID == calendarRequest.DeviceTypeID).ToList()
.ConvertAll(x => new CalendarView
{
ID = x.ID,
CMonth = x.CMonth,
CYear = x.CYear,
CDays = x.CDays,
CDeviceTypeID = x.CDeviceTypeID,
ClosedAtTime = x.ClosedAtTime,
ClosedByUser = x.ClosedByUser,
IsClosed = x.IsClosed,
CalendarDetails = x.CalendarDetails.ToList().ConvertAll(d => new CalendarDetailView
{
ID = d.ID,
CalendarID = d.CalendarID,
MachineID = d.MachineID,
MachineName = d.DATA_MACHINE.Name,
D1 = d.D1 ?? -1,
D2 = d.D2 ?? -1,
D3 = d.D3 ?? -1,
D4 = d.D4 ?? -1,
D5 = d.D5 ?? -1,
D6 = d.D6 ?? -1,
D7 = d.D7 ?? -1,
D8 = d.D8 ?? -1,
D9 = d.D9 ?? -1,
D10 = d.D10 ?? -1,
D11 = d.D11 ?? -1,
D12 = d.D12 ?? -1,
D13 = d.D13 ?? -1,
D14 = d.D14 ?? -1,
D15 = d.D15 ?? -1,
D16 = d.D16 ?? -1,
D17 = d.D17 ?? -1,
D18 = d.D18 ?? -1,
D19 = d.D19 ?? -1,
D20 = d.D20 ?? -1,
D21 = d.D21 ?? -1,
D22 = d.D22 ?? -1,
D23 = d.D23 ?? -1,
D24 = d.D24 ?? -1,
D25 = d.D25 ?? -1,
D26 = d.D26 ?? -1,
D27 = d.D27 ?? -1,
D28 = d.D28 ?? -1,
D29 = d.D29 ?? -1,
D30 = d.D30 ?? -1,
D31 = d.D31 ?? -1
})
}).FirstOrDefault();
return result;
}
}

Answer 5

Use [HttpGet] instead of [HttpPost] on the server
HttpResponseMessage response =
await client.GetAsync(string.format("api/product?id={0}&type={1}",param.Id.Value,param.Id.Type);
The difference between my answer and the NMK's accepted answer is the ? instead of the /
This is what worked for me