Get 请求

    private async Task<List<Demo>> GetResource(HttpClient httpClient)
        {
            var response = await httpClient.GetAsync("api/demos");
            response.EnsureSuccessStatusCode();

            var content = await response.Content.ReadAsStringAsync();
            var demos = JsonConvert.DeserializeObject<List<Demo>>(content);
            return demos;
        }

局部使用自定义请求头

    private async Task<List<Demo>> GetResourceThroughHttpRequestMessage(HttpClient httpClient)
        {
            var request = new HttpRequestMessage(HttpMethod.Get,"api/demos");
            request.Headers.Accept.Add(new MediaTypeWithQualityHeaderValue("application/xml"));

            var response = await httpClient.SendAsync(request);
            response.EnsureSuccessStatusCode();

            var content = await response.Content.ReadAsStringAsync();
            var serializer = new XmlSerializer(typeof(List<Demo>));
            var demos = (List<Demo>)serializer.Deserialize(new StringReader(content));
            return demos;
        }

Post 请求

简洁方式

    private async Task CreateResource(HttpClient httpClient)
        {
            var demoToCreate = new DemoForCreation()
            {
                Title = "some title",
                Description = "some description"
            };

            var response = await _httpClient.PostAsync(
                "api/demos",
                new StringContent(
                    JsonConvert.SerializeObject(demoToCreate),
                    Encoding.UTF8,
                    "application/json"));
            response.EnsureSuccessStatusCode();

            var content = await response.Content.ReadAsStringAsync();
            var demo = JsonConvert.DeserializeObject<Demo>(content);
        }

HttpRequestMessage 方式

    private async Task CreateResource(HttpClient httpClient)
        {
            var demoToCreate = new DemoForCreation()
            {
                Title = "some title",
                Description = "some description"
            };
            var serializedDemoToCreate = JsonConvert.SerializeObject(demoToCreate);

            var request = new HttpRequestMessage(HttpMethod.Post,"api/demos");
            request.Headers.Accept.Add(new MediaTypeWithQualityHeaderValue("application/xml"));

            request.Content = new StringContent(serializedDemoToCreate);
            request.Content.Headers.ContentType = new MediaTypeHeaderValue("application/json");

            var response = await httpClient.SendAsync(request);
            response.EnsureSuccessStatusCode();
            var content = await response.Content.ReadAsStringAsync();
            var serializer = new XmlSerializer(typeof(Demo));
            var demo = (Demo)serializer.Deserialize(new StringReader(content));
        }