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

Question

Hi 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; }

Sachin Singh · 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.

Sachin Singh · Answer

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 ; } }

Sachin Singh · Answer

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))

Kiran Mohanty · Answer

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.

Sujeet Raman · Answer

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))

Sujeet Raman · Answer

var content = JsonConvert.SerializeObject (input); still telling i need to deserialize

Sujeet Raman · Answer

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 Raman · Answer

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 Singh · Answer

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 Raman · Answer

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; }