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Restsharp Request gives "Argument 1: cannot convert from 'RestSharp.Method' to 'string?'" error

I am trying to call POST API request using restSharp 108.0.1v.
The code is as below;
var client = new RestClient("https://driver-vehicle-licensing.api.gov.uk/vehicle-enquiry/v1/vehicles");
var request = new RestRequest(Method.Post);
request.AddHeader("x-api-key", "MYAPIKEY");
request.AddHeader("Content-Type", "application/json");
request.AddParameter("application/json", "{\n\t\"registrationNumber\":\"AA19AAA\"\n}", ParameterType.RequestBody);
RestResponse response = client.Execute(request);
The snippet Method.Post of var request = new RestRequest(Method.Post);gives the error that I mentioned.
Please help me to solve this issue ?

Looking at the documentation here the first parameter of the RestRequest constructor is the subpath to the resource you want to access. Instead you should do something like the following
var client = new RestClient("https://driver-vehicle-licensing.api.gov.uk");
var request = new RestRequest("vehicle-enquiry/v1/vehicles", Method.Post);
// ... or I believe this should work as well:
var client = new RestClient("https://driver-vehicle-licensing.api.gov.uk/vehicle-enquiry/v1");
var request = new RestRequest("vehicles", Method.Post);

C# Send data with method POST to API

Dont know what i doing wrong, need to fill database with datas from my VSTO Outlook Addin.
jObjectbody.Add( new { mail_from = FromEmailAddress }); mail_from is name of column in database, FromEmailAddress is value from my Outlook Addin
How to send to API https://my.address.com/insertData correctly ?
RestClient restClient = new RestClient("https://my.address.com/");
JObject jObjectbody = new JObject();
jObjectbody.Add( new { mail_from = FromEmailAddress });
RestRequest restRequest = new RestRequest("insertData", Method.POST);
restRequest.RequestFormat = DataFormat.Json;
restRequest.AddParameter("text/html", jObjectbody, ParameterType.RequestBody);
IRestResponse restResponse = restClient.Execute(restRequest);
error : Could not determine JSON object type for type <>f__AnonymousType0`1[System.String].
If i try this in Postman (POST->Body->raw->JSON) data are strored in database, except dont use value just data.
{
"mail_from":"email#email.com"
}
thanks for any clue achieve success

You can use restRequest.AddJsonBody(jObjectbody); instead of AddParameter (which I believe adds a query string).
See the RestSharp AddJsonBody docs. They also mention to not use some sort of JObject as it wont work, so you will probably need to update your type as well.
The below might work for you:
RestClient restClient = new RestClient("https://my.address.com/");
var body = new { mail_from = "email#me.com" };
RestRequest restRequest = new RestRequest("insertData", Method.POST);
restRequest.AddJsonBody(body);
IRestResponse restResponse = restClient.Execute(restRequest);
// extra points for calling async overload instead
//var asyncResponse = await restClient.ExecuteTaskAsync(restRequest);

how to use restsharp web rest api

hi there i am new to rest api
i build these api
https://dastanito.ir/test/ex2/api/storiesmaster/read.php
https://dastanito.ir/test/ex2/api/storiesmaster/read_one.php?id=60
i used requests lib in python and everything is ok
but i do not know how to use this with restsharp
var client = new RestClient("https://dastanito.ir/test/ex2/api/storiesmaster/read.php");
var request = new RestRequest("");
var response = client.Post(request);
MessageBox.Show(response.Content.ToString());

Based on RestSharp sample:
var client = new RestClient("https://dastanito.ir");
var request = new RestRequest("test/ex2/api/storiesmaster/read.php", Method.GET);
// execute the request
IRestResponse response = client.Execute(request);
var content = response.Content; // raw content as string
Output:
{"StoriesMasters":[{"id":"2","story_code":"002a","master_code":"he3385_1"},{"id":"60","story_code":"001a","master_code":"he3385_1"},{"id":"3","story_code":"c57675","master_code":"ara3433_2"},{"id":"50","story_code":"d8885","master_code":"za76787_3"}]}

RestSharp get full URL of a request

Is there a way to get the full url of a RestSharp request including its resource and querystring parameters?
I.E for this request:
RestClient client = new RestClient("http://www.some_domain.com");
RestRequest request = new RestRequest("some/resource", Method.GET);
request.AddParameter("some_param_name", "some_param_value", ParameterType.QueryString);
IRestResponse<ResponseData> response = client.Execute<ResponseData>(request);
I would like to get the full request URL:
http://www.some_domain.com/some/resource?some_param_name=some_param_value

To get the full URL use RestClient.BuildUri()
Specifically, in this example use client.BuildUri(request):
RestClient client = new RestClient("http://www.some_domain.com");
RestRequest request = new RestRequest("some/resource", Method.GET);
request.AddParameter("some_param_name", "some_param_value", ParameterType.QueryString);
IRestResponse<ResponseData> response = client.Execute<ResponseData>(request);
var fullUrl = client.BuildUri(request);

Well, it is pretty tricky.
To get the full requested URL use RestClient.Execute(request).ResponseUri to be sure it is the already sent request.
In this example:
RestClient client = new RestClient("http://www.some_domain.com");
RestRequest request = new RestRequest("some/resource", Method.GET);
request.AddParameter("some_param_name", "some_param_value", ParameterType.QueryString);
IRestResponse<ResponseData> response = client.Execute<ResponseData>(request);
Uri fullUrl = response.ResponseUri;
This code:
Console.WriteLine(string.Format("response URI: {0}", response.ResponseUri.ToString()));
returns:
response URI: http://www.some_domain.com/some/resource?some_param_name=some_param_value

RestSharp authentication with Api Id and Api Key

I have to call a restful API, but the only details I have are an API ID and an API key.
I am trying to use Restsharp library code like this.
var client = new RestClient("https://xxxxxxx");
client.Authenticator = new HttpBasicAuthenticator("xxxxx", "yyyyyy");
I get a 401 authorization required error.
Could you please point me in the right direction.
Thanks.

Here is the solution that i came up with.
this returns the client object
private RestClient InitializeAndGetClient()
{
var cookieJar = new CookieContainer();
var client = new RestClient("https://xxxxxxx")
{
Authenticator = new HttpBasicAuthenticator("xxIDxx", "xxKeyxx"),
CookieContainer = cookieJar
};
return client;
}
and you can use the method like
var client = InitializeAndGetClient();
var request = new RestRequest("report/transaction", Method.GET);
request.AddParameter("option", "value");
//Run once to get cookie.
var response = client.Execute(request);
//Run second time to get actual data
response = client.Execute(request);
Hope this helps you.
Prakash.

I know this is old but this is partial to what I needed:
var cookieJar = new CookieContainer();
var client = new RestClient("https://xxxxxxx")
{
Authenticator = new HttpBasicAuthenticator("[username]", "[password]"),
CookieContainer = cookieJar
};
Then right after I made the request object I had to add the API_KEY header:
var request = new RestRequest("[api]/[method]"); // this will be unique to what you are connecting to
request.AddHeader("API_KEY", "[THIS IS THE API KEY]");