httpclient c# tutorial

// HttpClient is intended to be instantiated once per application, rather than per-use. See Remarks. static readonly HttpClient client = new HttpClient(); static async Task Main() { // Call asynchronous network methods in a try/catch block to handle exceptions. try { HttpResponseMessage response = await client.GetAsync("http://www.contoso.com/"); response.EnsureSuccessStatusCode(); string responseBody = await response.Content.ReadAsStringAsync(); // Above three lines can be replaced with new helper method below // string responseBody = await client.GetStringAsync(uri); Console.WriteLine(responseBody); } catch(HttpRequestException e) { Console.WriteLine("nException Caught!"); Console.WriteLine("Message :{0} ",e.Message); } }

//Base code from: http://zetcode.com/csharp/httpclient/ public async string Example() { //The data that needs to be sent. Any object works. var pocoObject = new { Name = "John Doe", Occupation = "gardener" }; //Converting the object to a json string. NOTE: Make sure the object doesn't contain circular references. string json = JsonConvert.SerializeObject(pocoObject); //Needed to setup the body of the request StringContent data = new StringContent(json, Encoding.UTF8, "application/json"); //The url to post to. var url = "https://httpbin.org/post"; var client = new HttpClient(); //Pass in the full URL and the json string content var response = await client.PostAsync(url, data); //It would be better to make sure this request actually made it through string result = await response.Content.ReadAsStringAsync(); //close out the client client.Dispose(); return result; }

httpclient C#

//example code
//var lst = await service.ConnectHttpClient<User, List<User>>("api/User/GetUserInfoByUserId", new User() { UserId = 1 });
//var lst = await service.ConnectRestClient<User, List<User>>("api/User/GetUserInfoByUserId", new User() { UserId = 1 });

public async Task<M> ConnectHttpClient<R, M>(string apiUrl, R reqModel)
{
    M model = default(M);

    HttpClient client = new HttpClient();
    client.BaseAddress = new Uri(baseUrl);
    client.DefaultRequestHeaders.Accept.Clear();
    client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
    HttpResponseMessage response = await client.PostAsJsonAsync(apiUrl, reqModel);
    if (response.IsSuccessStatusCode)
    {
        var res = response.Content.ReadAsStringAsync().Result;
        model = JsonConvert.DeserializeObject<M>(res);
    }
    return model;
}

public async Task<M> ConnectRestClient<R, M>(string apiUrl, R reqModel)
{
    M model = default(M);

    RestClient restClient = new RestClient(baseUrl);
    RestRequest restRequest = new RestRequest(apiUrl, Method.POST, DataFormat.Json);
    restRequest.AddJsonBody(reqModel);
    IRestResponse restResponse = await restClient.ExecuteAsync(restRequest);
    if (restResponse.IsSuccessful)
    {
        string response = restResponse.Content;
        model = JsonConvert.DeserializeObject<M>(response);
    }
    return model;
}

Posted by: Guest on June-14-2021

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