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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);

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"}]}

C# winform send request content type application/x-www-form-urlencoded with Restsharp

I am developing an small app with C# window form.
I can use Restsharp to send any request with content type application/json. But with application/x-www-form-urlencoded the server always return nothing or Internal error.
I have tested this api with Postman and Restlet Client and it work well.
Following some example on internet but it not work too.
Here is my code:
var client = new RestClient("http://www.nhimanhma.com");
var request = new RestRequest("users/sign_in", Method.POST);
request.AddHeader("content-type", "application/x-www-form-urlencoded");
string formData = $"token={token}&user[email]={email}&user[password]={password}";
string urlEncode = RestSharp.Extensions.StringExtensions.UrlEncode(formData);
request.AddParameter("application/x-www-form-urlencoded", urlEncode, ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
var content = response.Content;

Use RestSharp Post Object as JSON and read it from the other side of the call

I have a C# REST Web API and I have some code like this that makes a request to an endpoint. Some of the data that I want to pass along is an object of my own type and since it is a complex object, I would like to pass it using POST.
RestClient client = new RestClient(Constants.Endpoints.serviceEndPoint)
{
Timeout = 1000
};
string requestResource = Constants.Endpoints.apiEndPoint;
RestRequest request = new RestRequest(requestResource, Method.POST);
request.AddParameter("Authorization", $"Bearer {accessToken}", ParameterType.HttpHeader);
request.AddHeader("Accept", "application/json");
request.AddParameter("id", id, ParameterType.UrlSegment);
request.AddParameter("text/json", objectIWantToSerialize, ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
On the other side, I am trying to read the object itself with some code like this
var provider = new MultipartMemoryStreamProvider();
await Request.Content.ReadAsMultipartAsync(provider);
foreach (var content in provider.Contents)
{
// what should I do here to read the content as a JSON
// and then transform it as the object it used to be before the call?
}
I tried to do await content.ReadAsJsonAsync< MyType>(); but also tried await content.ReadAsStringAsync(); and none of these worked. Am I doing something wrong at the time I execute in the client? Or is it something that I am doing on the other side while reading the content?

Instead of this line:
request.AddParameter("text/json", objectIWantToSerialize, ParameterType.RequestBody);
You should use the .AddBody(object) method.
So you're code would look like this:
RestRequest request = new RestRequest(requestResource, Method.POST);
//add other headers as needed
request.RequestFormat = DataFormat.Json;
request.AddBody(objectIWantToSerialize);
IRestResponse response = client.Execute(request);
On the server, if you're using MVC/WebAPI, you can just put the C# type as the input and ASP.NET will deserialize it for you. If not, can you provide more context about how you're receiving the request?

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