using System.IO;using System.Net;using System.Threading.Tasks;

//Postpublic static string HttpPost(string url, string body){	Encoding encoding = Encoding.UTF8;	HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);	request.Method = "POST";	request.Accept = "text/html, application/xhtml+xml, */*";	request.ContentType = "application/json";
	byte[] buffer = encoding.GetBytes(body);	request.ContentLength = buffer.Length;	request.GetRequestStream().Write(buffer, 0, buffer.Length);	HttpWebResponse response = (HttpWebResponse)request.GetResponse();	using (StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8))	{		return reader.ReadToEnd();	}}
//GETpublic static string HttpGet(string url){	Encoding encoding = Encoding.UTF8;	HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);	request.Method = "GET";	request.Accept = "text/html, application/xhtml+xml, */*";	request.ContentType = "application/json";
	HttpWebResponse response = (HttpWebResponse)request.GetResponse();	using (StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8))	{		return reader.ReadToEnd();	}}

static HttpClient client = new HttpClient();
//根据 ID 获取产品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;}
//创建新产品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;}
//更新产品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;}
//删除产品static async Task<HttpStatusCode> DeleteProductAsync(string id){	HttpResponseMessage response = await client.DeleteAsync(		$"api/products/{id}");	return response.StatusCode;}

static async Task RunAsync(){    client.BaseAddress = new Uri("http://localhost:64195/");    client.DefaultRequestHeaders.Accept.Clear();    client.DefaultRequestHeaders.Accept.Add(        new MediaTypeWithQualityHeaderValue("application/json"));
    try    {        Product product = new Product        {            Name = "Gizmo",            Price = 100,            Category = "Widgets"        };
        var url = await CreateProductAsync(product);        Console.WriteLine($"Created at {url}");
        // Get the product        product = await GetProductAsync(url.PathAndQuery);        ShowProduct(product);
        // Update the product        Console.WriteLine("Updating price...");        product.Price = 80;        await UpdateProductAsync(product);
        // Get the updated product        product = await GetProductAsync(url.PathAndQuery);        ShowProduct(product);
        // Delete the product        var statusCode = await DeleteProductAsync(product.Id);        Console.WriteLine($"Deleted (HTTP Status = {(int)statusCode})");
    }    catch (Exception e)    {        Console.WriteLine(e.Message);    }
    Console.ReadLine();}