标签：auto com ons cal ase 返回值 fda sts void
本Demo大部分参考原著：http://www.jianshu.com/p/cfdaf6857e7e
在WebApi发布之前，我们都是通过WebRequest/WebResponse这两个类组合来调用HTTP接口的
封装一个RestClient类
using System; using System.Collections.Generic; using System.IO; using System.Linq; using System.Net; using System.Text; using System.Web; namespace WebApplication1 { public class RestClient { private string BaseUri; public RestClient(string baseUri) { this.BaseUri = baseUri; } #region Get请求 public string Get(string uri) { //先根据用户请求的uri构造请求地址 string serviceUrl = string.Format("{0}/{1}", this.BaseUri, uri); //创建Web访问对 象 HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(serviceUrl); //通过Web访问对象获取响应内容 HttpWebResponse myResponse = (HttpWebResponse)myRequest.GetResponse(); //通过响应内容流创建StreamReader对象，因为StreamReader更高级更快 StreamReader reader = new StreamReader(myResponse.GetResponseStream(),Encoding.UTF8); //string returnXml = HttpUtility.UrlDecode(reader.ReadToEnd());//如果有编码问题就用这个方法 string returnXml = reader.ReadToEnd();//利用StreamReader就可以从响应内容从头读到尾 reader.Close(); myResponse.Close(); return returnXml; } #endregion #region Post请求 public string Post(string data, string uri) { //先根据用户请求的uri构造请求地址 string serviceUrl = string.Format("{0}/{1}", this.BaseUri, uri); //创建Web访问对象 HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(serviceUrl); //把用户传过来的数据转成“UTF-8”的字节流 byte[] buf = System.Text.Encoding.GetEncoding("UTF-8").GetBytes(data); myRequest.Method = "POST"; myRequest.ContentLength = buf.Length; myRequest.ContentType = "application/json"; myRequest.MaximumAutomaticRedirections = 1; myRequest.AllowAutoRedirect = true; //发送请求 Stream stream = myRequest.GetRequestStream(); stream.Write(buf,0,buf.Length); stream.Close(); //获取接口返回值 //通过Web访问对象获取响应内容 HttpWebResponse myResponse = (HttpWebResponse)myRequest.GetResponse(); //通过响应内容流创建StreamReader对象，因为StreamReader更高级更快 StreamReader reader = new StreamReader(myResponse.GetResponseStream(), Encoding.UTF8); //string returnXml = HttpUtility.UrlDecode(reader.ReadToEnd());//如果有编码问题就用这个方法 string returnXml = reader.ReadToEnd();//利用StreamReader就可以从响应内容从头读到尾 reader.Close(); myResponse.Close(); return returnXml; } #endregion #region Put请求 public string Put(string data, string uri) { //先根据用户请求的uri构造请求地址 string serviceUrl = string.Format("{0}/{1}", this.BaseUri, uri); //创建Web访问对象 HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(serviceUrl); //把用户传过来的数据转成“UTF-8”的字节流 byte[] buf = System.Text.Encoding.GetEncoding("UTF-8").GetBytes(data); myRequest.Method = "PUT"; myRequest.ContentLength = buf.Length; myRequest.ContentType = "application/json"; myRequest.MaximumAutomaticRedirections = 1; myRequest.AllowAutoRedirect = true; //发送请求 Stream stream = myRequest.GetRequestStream(); stream.Write(buf, 0, buf.Length); stream.Close(); //获取接口返回值 //通过Web访问对象获取响应内容 HttpWebResponse myResponse = (HttpWebResponse)myRequest.GetResponse(); //通过响应内容流创建StreamReader对象，因为StreamReader更高级更快 StreamReader reader = new StreamReader(myResponse.GetResponseStream(), Encoding.UTF8); //string returnXml = HttpUtility.UrlDecode(reader.ReadToEnd());//如果有编码问题就用这个方法 string returnXml = reader.ReadToEnd();//利用StreamReader就可以从响应内容从头读到尾 reader.Close(); myResponse.Close(); return returnXml; } #endregion #region Delete请求 public string Delete(string data, string uri) { //先根据用户请求的uri构造请求地址 string serviceUrl = string.Format("{0}/{1}", this.BaseUri, uri); //创建Web访问对象 HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(serviceUrl); //把用户传过来的数据转成“UTF-8”的字节流 byte[] buf = System.Text.Encoding.GetEncoding("UTF-8").GetBytes(data); myRequest.Method = "DELETE"; myRequest.ContentLength = buf.Length; myRequest.ContentType = "application/json"; myRequest.MaximumAutomaticRedirections = 1; myRequest.AllowAutoRedirect = true; //发送请求 Stream stream = myRequest.GetRequestStream(); stream.Write(buf, 0, buf.Length); stream.Close(); //获取接口返回值 //通过Web访问对象获取响应内容 HttpWebResponse myResponse = (HttpWebResponse)myRequest.GetResponse(); //通过响应内容流创建StreamReader对象，因为StreamReader更高级更快 StreamReader reader = new StreamReader(myResponse.GetResponseStream(), Encoding.UTF8); //string returnXml = HttpUtility.UrlDecode(reader.ReadToEnd());//如果有编码问题就用这个方法 string returnXml = reader.ReadToEnd();//利用StreamReader就可以从响应内容从头读到尾 reader.Close(); myResponse.Close(); return returnXml; } #endregion } }
在Web API发布的同时，.NET提供了两个程序集：System.Net.Http和System.Net.Http.Formatting。这两个程序集中最核心的类是HttpClient
以前的用法：创建一个控制台程序，测试HTTP接口的调用。
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using WebApplication1; namespace ConsoleApplication1 { class Program { static void Main(string[] args) { RestClient client = new RestClient("http://localhost:2444/"); string result = client.Get("api/Values"); Console.WriteLine(result); Console.ReadKey(); } } }
.NET提供了两个程序集：System.Net.Http和System.Net.Http.Formatting。这两个程序集中最核心的类是HttpClient。在.NET4.5中带有这两个程序集，而.NET4需要到Nuget里下载Microsoft.Net.Http和Microsoft.AspNet.WebApi.Client这两个包才能使用这个类，更低的.NET版本就只能表示遗憾了只能用WebRequest/WebResponse或者WebClient来调用这些API了。
//控制台代码 using System; using System.Collections.Generic; using System.Linq; using System.Net.Http; using System.Net.Http.Formatting; using System.Net.Http.Headers; using System.Text; using System.Threading.Tasks; using WebApplication1; using WebApplication1.Models; namespace ConsoleApplication1 { class Program { static void Main(string[] args) { //RestClient client = new RestClient("http://localhost:2444/"); //string result = client.Get("api/Values"); //Console.WriteLine(result); //Console.ReadKey(); var client = new HttpClient(); //基本的API URL client.BaseAddress = new Uri("http://localhost:2444/"); //默认希望响应使用Json序列化(内容协商机制，我接受json格式的数据) client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json")); //运行client接收程序 Run(client); Console.ReadLine(); } //client接收处理（都是异步的处理） static async void Run(HttpClient client) { //post 请求插入数据 var result = await AddPerson(client); Console.WriteLine($"添加结果：{result}"); //添加结果：true //get 获取数据 var person = await GetPerson(client); //查询结果：Id=1 Name=test Age=10 Sex=F Console.WriteLine($"查询结果：{person}"); //put 更新数据 result = await PutPerson(client); //更新结果：true Console.WriteLine($"更新结果：{result}"); //delete 删除数据 result = await DeletePerson(client); //删除结果：true Console.WriteLine($"删除结果：{result}"); } //post static async Task<bool> AddPerson(HttpClient client) { //向Person发送POST请求，Body使用Json进行序列化 return await client.PostAsJsonAsync("api/Person", new Person() { Age = 10, Id = 1, Name = "test", Sex = "F" }) //返回请求是否执行成功，即HTTP Code是否为2XX .ContinueWith(x => x.Result.IsSuccessStatusCode); } //get static async Task<Person> GetPerson(HttpClient client) { //向Person发送GET请求 return await await client.GetAsync("api/Person/1") //获取返回Body，并根据返回的Content-Type自动匹配格式化器反序列化Body内容为对象 .ContinueWith(x => x.Result.Content.ReadAsAsync<Person>( new List<MediaTypeFormatter>() {new JsonMediaTypeFormatter()/*这是Json的格式化器*/ ,new XmlMediaTypeFormatter()/*这是XML的格式化器*/})); } //put static async Task<bool> PutPerson(HttpClient client) { //向Person发送PUT请求，Body使用Json进行序列化 return await client.PutAsJsonAsync("api/Person/1", new Person() { Age = 10, Id = 1, Name = "test1Change", Sex = "F" }) .ContinueWith(x => x.Result.IsSuccessStatusCode); //返回请求是否执行成功，即HTTP Code是否为2XX } //delete static async Task<bool> DeletePerson(HttpClient client) { return await client.DeleteAsync("api/Person/1") //向Person发送DELETE请求 .ContinueWith(x => x.Result.IsSuccessStatusCode); //返回请求是否执行成功，即HTTP Code是否为2XX } } }
这个例子就是控制台通过HttpClient这个类调用WebApi中的方法，WebApi就是项目新创建的ValuesController那个控制器，什么都没动，测试结果如下：
标签：auto com ons cal ase 返回值 fda sts void
原文地址：http://www.cnblogs.com/BOSET/p/7089284.html
