How to send post parameter in httpclient in asp.net core 3.1?

Sujeet Raman

5y15.3k.NET

I am trying an http call to get the input response..my strategy is i am calling httpcall from controller with a general url..i am facing some issues i am getting internal server error also i dont know my way is right please suggest me if i am wrong..

1.input parameter passing is right here?

2.I am getting server error because of this i dont know why? please help

my controller class and the url i am calling from postman is api/Details/Check this link i will put in postman and doing all

[HttpPost("api/Details/Check")]
public async Task Check([FromBody] details input)
{
var result = await _resultcheker .ResultCheckercall(input);
}
the call will goto ResultCheckercall
public async Task Checkercall(CheckInput input)
{
CheckResults CheckInputResult = new yCheckResults();
using (var httpClient = new HttpClient())
{
var content = new StringContent(JsonConvert.SerializeObject(input), Encoding.UTF8, "application/json");
using (var response = await httpClient.PostAsync("https://localhost:5443/api/Alldetails/details", content))
{
string apiResponse = await response.Content.ReadAsStringAsync();
CheckInputResult = JsonConvert.DeserializeObject(apiResponse);
}
}
return yCheckInputResult;
}

10 Replies

Know the answer? Post it — somebody with the same question will find it here.

Sachin Singh5y ago
Accepted answer
you can post a complex object (Employee, Author i.e any class type) as shown below
[HttpPost]
        public int AddEmployees(Employee employee)
        {
            try
            {
                if (ModelState.IsValid)
                {

                    var getEmployee = client.PostAsJsonAsync("api/Employee", employee).Result;
                    if (getEmployee.IsSuccessStatusCode)
                    {
                        return 1;
                    }

                }
                return 0;
            }
            catch (Exception ex)
            {
                return 0;
            }
        }
you can paas a single value similarly as shown below
[HttpPost]
        public int AddString(string str)
        {
            try
            {
                if (ModelState.IsValid)
                {

                    var res = client.PostAsJsonAsync("api/Employee", str).Result;
                    if (res.IsSuccessStatusCode)
                    {
                        return 1;
                    }

                }
                return 0;
            }
            catch (Exception ex)
            {
                return 0;
            }
        }
follow the link https://www.sharpencode.com/article/WebApi/consuming-web-api-in-mvc-application
HttpClient behaves same in .Net Core or any other platforms.
Sujeet Raman5y ago
var content = JsonConvert.SerializeObject(input); still telling i need to deserialize
Sachin Singh5y ago
according to your response , your class would be
var content= JsonConvert.DeserializeObject(myJsonResponse);
    public class Root    {
        public string productid { get; set; }
        public string productcorenumber { get; set; }
        public string value { get; set; }
        public List<int> contacts { get; set; }
        public string ispassed { get; set; }
        public string isok { get; set; }
        public string isgood { get; set; }
    }
Sujeet Raman5y ago
InDetail.................

in post man ill give input like this for post in http://localhost:2001/api/ProductQuality/Check"

{
"productid": "2274",
"productcorenumber": "1321",
"value": "AE1C1F-0363-D6F-B3D-AE0029A8",
"contacts": [
15998,
1012
],
"ispassed": "0",
"isok": "0",
"isgood": "false"
}
and this will come to here(I have one method in my controller)

[HttpPost("api/ProductQuality/Check")]
public async Task Check([FromBody] CheckInput input)
{
var result = await _Checker.Checkercall(input);
}

in Checkercall class implimentation i am calling another api(as of now calling the same for testing purposes)
public async Task Checkercall(CheckInput input)
{
QualityCheckResults QualityCheckInputResult = new QualityCheckResults();
using (var httpClient = new HttpClient())
{
var content = new StringContent(JsonConvert.SerializeObject(input), Encoding.UTF8,
"application/json");
using (var response = await
httpClient.PostAsync("https://localhost:2001/api/ProductQuality/Check", content))
//hope i have to give https here
{
string apiResponse = await response.Content.ReadAsStringAsync();
QualityCheckInputResult = JsonConvert.DeserializeObject
(apiResponse);
}
}
return QualityCheckInputResult;
}
I am getting Unhandled exception here but i couldn't understand the issue ,please anyone tell me what is wrong here
Sujeet Raman5y ago
Compiler telling Deserilize instead of serilize here--
var content = JsonConvert.SerializeObject(YourJsondata);
I need to create class for input-the parameter? this input i am giving in postman
Sachin Singh5y ago
create a class and then parse the json into it
var content = JsonConvert.DeSerializeObject(JsonString);
now you can paas in this content as post body.
if you are not able to create a proper class then share your json string and we will design the class based on that.
Sujeet Raman5y ago
I am getting error Unhandled Exception. while debugging the code could not understand the issue.error in this part

var content = new StringContent(JsonConvert.SerializeObject(input), Encoding.UTF8, "application/json");

here parameter input is a jsondata

public async Checkercall(QCheckInput input)
{
CheckResultsCheckInputResult = new QCheckResults();
using (var httpClient = new HttpClient())
{
var content = new StringContent(JsonConvert.SerializeObject(input), Encoding.UTF8, "application/json");
using (var response = await httpClient.PostAsync("https://localhost:5871/api/ProductQuality/Check", content))
{
string apiResponse = await response.Content.ReadAsStringAsync();
QualityCheckInputResult = JsonConvert.DeserializeObject(apiResponse);
}
}
return QualityCheckInputResult;
}
Kiran Mohanty5y ago
Can you please debug it ? Keep a break point in (api/Alldetails/details) the action and see what is happening once httpClient issues post request.
Sachin Singh5y ago
better is to serialize into a type so that HttpClient could send it normally
var content = JsonConvert.SerializeObject(YourJsondata);
using (var response = await httpClient.PostAsync("https://localhost:5443/api/Alldetails/details", content))
Sujeet Raman5y ago
can i do like this?

var content = new StringContent(JsonConvert.SerializeObject(input), Encoding.UTF8, "application/json");
using (var response = await httpClient.PostAsync("https://localhost:5443/api/Alldetails/details", content))