咨询区
- Hooch:
如何使用 Post Request 呢?
回答区
- Evan Mulawski:
有多种方式可以使用 Http 的 GET 和 Post 请求。
A方法:HttpClient (推荐)
HttpClient 可用于 .NET Framework 4.5+, .NET Standard 1.1+,.NET Core 1.0+,当前是最值得推荐的方式,它支持异步并且高性能,如果你是非常老的平台,还得需要从 Nuget 上安装一下 System.Net.Http。
HttpClient 推荐的做法就是在应用程序生命周期内初始化一次,除非你有特殊的理由不这么做,使用方法如下:
private static readonly HttpClient client = new HttpClient();
- POST 方式
var values = new Dictionary<string, string>
{
{ "thing1", "hello" },
{ "thing2", "world" }
};
var content = new FormUrlEncodedContent(values);
var response = await client.PostAsync("http://www.example.com/recepticle.aspx", content);
var responseString = await response.Content.ReadAsStringAsync();
- GET
var responseString = await client.GetStringAsync("http://www.example.com/recepticle.aspx");
B方法:第三方包
RestSharp
- POST
var client = new RestClient("http://example.com");
// client.Authenticator = new HttpBasicAuthenticator(username, password);
var request = new RestRequest("resource/{id}");
request.AddParameter("thing1", "Hello");
request.AddParameter("thing2", "world");
request.AddHeader("header", "value");
request.AddFile("file", path);
var response = client.Post(request);
var content = response.Content; // Raw content as string
var response2 = client.Post<Person>(request);
var name = response2.Data.Name;
Flurl.Http
这是一个比较新的工具包,拥有便捷易用的 API 接口,底层使用的是 HttpClient,而且支持移植,可以在 Nuget 上获取。
- POST
var responseString = await "http://www.example.com/recepticle.aspx"
.PostUrlEncodedAsync(new { thing1 = "hello", thing2 = "world" })
.ReceiveString();
- GET
var responseString = await "http://www.example.com/recepticle.aspx"
.GetStringAsync();
C方法:HttpWebRequest (不推荐)
它可用于 .NET Framework 1.1+, .NET Standard 2.0+,.NET Core 1.0+,在 .netcore 中仅仅是为了兼容而存在的,它封装了 HttpClient,性能较差,也没有提供什么新功能。
- POST
var request = (HttpWebRequest)WebRequest.Create("http://www.example.com/recepticle.aspx");
var postData = "thing1=" + Uri.EscapeDataString("hello");
postData += "&thing2=" + Uri.EscapeDataString("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();
- GET
var request = (HttpWebRequest)WebRequest.Create("http://www.example.com/recepticle.aspx");
var response = (HttpWebResponse)request.GetResponse();
var responseString = new StreamReader(response.GetResponseStream()).ReadToEnd();
D方法:WebClient (不推荐)
WebClient 封装了 HttpWebRequest,在 .NET Framework 1.1+,NET Standard 2.0+,.NET Core 2.0+ 中可用。
- POST
using (var client = new WebClient())
{
var values = new NameValueCollection();
values["thing1"] = "hello";
values["thing2"] = "world";
var response = client.UploadValues("http://www.example.com/recepticle.aspx", values);
var responseString = Encoding.Default.GetString(response);
}
- GET
using (var client = new WebClient())
{
var responseString = client.DownloadString("http://www.example.com/recepticle.aspx");
}