一个 Github 上使用 HttpClient 的 Sample

地址：https://github.com/MikeWasson/HttpClientSample

截图：

直接贴代码了：

服务端：

    [RoutePrefix("api/products")]
    public class ProductsController : ApiController
    {
        private static ConcurrentDictionary<string, Product> _products = new ConcurrentDictionary<string, Product>();

        [Route("{id}", Name = "GetById")]
        public IHttpActionResult Get(string id)
        {
            Product product = null;
            if (_products.TryGetValue(id, out product))
            {
                return Ok(product);
            }
            else
            {
                return NotFound();
            }
        }

        [HttpPost]
        [Route("")]
        public IHttpActionResult Post(Product product)
        {
            if (product == null)
            {
                return BadRequest("Product cannot be null");
            }
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            product.Id = Guid.NewGuid().ToString();
            _products[product.Id] = product;
            return CreatedAtRoute("GetById", new { id = product.Id }, product);
        }

        [HttpPut]
        [Route("{id}")]
        public IHttpActionResult Put(string id, Product product)
        {
            if (product == null)
            {
                return BadRequest("Product cannot be null");
            }
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }
            if (product.Id != id)
            {
                return BadRequest("product.id does not match id parameter");
            }

            if (!_products.Keys.Contains(id))
            {
                return NotFound();
            }

            _products[id] = product;
            return new StatusCodeResult(HttpStatusCode.NoContent, this);
        }

        [HttpDelete]
        [Route("{id}")]
        public IHttpActionResult Delete(string id)
        {
            Product product = null;
            _products.TryRemove(id, out product);
            return new StatusCodeResult(HttpStatusCode.NoContent, this);
        }
    }

完毕！

客户端

    class Program
    {
        static HttpClient client = new HttpClient();

        static void ShowProduct(Product product)
        {
            Console.WriteLine($"Name: {product.Name}\tPrice: {product.Price}\tCategory: {product.Category}");
        }

        static async Task<Uri> CreateProductAsync(Product product)
        {
            HttpResponseMessage response = await client.PostAsJsonAsync("api/products", product);
            response.EnsureSuccessStatusCode();

            // return URI of the created resource.
            return response.Headers.Location;
        }

        static async Task<Product> GetProductAsync(string path)
        {
            Product product = null;
            HttpResponseMessage response = await client.GetAsync(path);
            if (response.IsSuccessStatusCode)
            {
                product = await response.Content.ReadAsAsync<Product>();
            }
            return product;
        }

        static async Task<Product> UpdateProductAsync(Product product)
        {
            HttpResponseMessage response = await client.PutAsJsonAsync($"api/products/{product.Id}", product);
            response.EnsureSuccessStatusCode();

            // Deserialize the updated product from the response body.
            product = await response.Content.ReadAsAsync<Product>();
            return product;
        }

        static async Task<HttpStatusCode> DeleteProductAsync(string id)
        {
            HttpResponseMessage response = await client.DeleteAsync($"api/products/{id}");
            return response.StatusCode;
        }

        static void Main()
        {
            RunAsync().Wait();
        }

        static async Task RunAsync()
        {
            client.BaseAddress = new Uri("http://localhost:55268/");
            client.DefaultRequestHeaders.Accept.Clear();
            client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

            try
            {
                // Create a new product
                Product product = new Product { Name = "Gizmo", Price = , Category = "Widgets" };

                var url = await CreateProductAsync(product);
                Console.WriteLine($"Created at {url}");

                // Get the product
                product = await GetProductAsync(url.PathAndQuery);
                ShowProduct(product);

                // Update the product
                Console.WriteLine("Updating price...");
                product.Price = ;
                await UpdateProductAsync(product);

                // Get the updated product
                product = await GetProductAsync(url.PathAndQuery);
                ShowProduct(product);

                // Delete the product
                var statusCode = await DeleteProductAsync(product.Id);
                Console.WriteLine($"Deleted (HTTP Status = {(int)statusCode})");

            }
            catch (Exception e)
            {
                Console.WriteLine(e.Message);
            }

            Console.ReadLine();
        }

    }

谢谢浏览！