.NET/C#发起GET和POST请求的几种方法
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using System.Net;
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GET：
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var request = (HttpWebRequest)WebRequest.Create("http://www.leadnt.com/recepticle.aspx");
var response = (HttpWebResponse)request.GetResponse();
var responseString = new StreamReader(response.GetResponseStream()).ReadToEnd();
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POST：
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var request = (HttpWebRequest)WebRequest.Create("http://www.leadnt.com/recepticle.aspx");
var postData = "thing1=hello";
postData += "&thing2=world";
var data = Encoding.ASCII.GetBytes(postData);
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
request.ContentLength = data.Length;
using (var stream = request.GetRequestStream())
{
stream.Write(data, 0, data.Length);
}
var response = (HttpWebResponse)request.GetResponse();
var responseString = new StreamReader(response.GetResponseStream()).ReadToEnd();
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第二种：WebClient，也过时了：
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using System.Net;
using System.Collections.Specialized;
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GET：
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using (var client = new WebClient())
{
var responseString = client.DownloadString("http://www.leadnt.com/recepticle.aspx");
}
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POST：
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using (var client = new WebClient())
{
var values = new NameValueCollection();
values["thing1"] = "hello";
values["thing2"] = "world";
var response = client.UploadValues("http://www.leadnt.com/recepticle.aspx", values);
var responseString = Encoding.Default.GetString(response);
}
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第三种：HttpClient 当前主流用法，异步请求，自.NET4.5开始可从Nuget包管理中获取。
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using System.Net.Http;
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GET:
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using (var client = new HttpClient())
{
var responseString = client.GetStringAsync("http://www.mydomain.com/recepticle.aspx");
}
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POST:
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using (var client = new HttpClient())
{
var values = new List<KeyValuePair<string, string>>();
values.Add(new KeyValuePair<string, string>("thing1", "hello"));
values.Add(new KeyValuePair<string, string>("thing2 ", "world"));
var content = new FormUrlEncodedContent(values);
var response = await client.PostAsync("http://www.mydomain.com/recepticle.aspx", content);
var responseString = await response.Content.ReadAsStringAsync();
}
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第四种：第三方类库：
REST API请求测试类库，可通过 NuGet 获得。
最新的便捷的api测试工具，使用HttpClient实现，可通过 NuGet 安装。
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using Flurl.Http;
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GET:
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var responseString = await "http://www.mydomain.com/recepticle.aspx"
.GetStringAsync();
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POST:
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var responseString = await "http://www.mydomain.com/recepticle.aspx"
.PostUrlEncodedAsync(new { thing1 = "hello", thing2 = "world" })
.ReceiveString();
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