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RestSharp 是一个基于 .NET 框架的 REST 客户端，RestSharp 是一个轻量的，不依赖任何第三方的组件或者类库的 HTTP 组件，RestSharp具有以下的优点：

01、支持.NET4.5.2+ 和 .NET Standard 2.0 平台
02、使用NuGet轻松安装开发包
03、自动 XML 和 JSON 反序列化
04、通过 ISerializer 和 IDeserializer 自定义序列化和反序列化为
05、模糊匹配元素名称 (例如：XML或JSON中的product_id将匹配名为ProductId的C#属性)
06、自动检测返回内容的类型
07、指出 GET, POST, PUT, PATCH, HEAD, OPTIONS, DELETE 和 COPY 请求，支持其它非标准 HTTP 方法
08、OAuth 1.0、OAuth 2.0、Basic、NTLM 和基于参数的身份认证
09、通过 IAuthenticator 接口自定义身份验证方案
10、支持异步操作

官方提供的一些示例：

var client = new RestClient("https://www.xcode.me");
// client.Authenticator = new HttpBasicAuthenticator(username, password);

var request = new RestRequest("resource/{id}", Method.POST);
request.AddParameter("name", "value"); // adds to POST or URL querystring based on Method
request.AddUrlSegment("id", "123"); // replaces matching token in request.Resource

// add parameters for all properties on an object
request.AddObject(object);

// or just whitelisted properties
request.AddObject(object, "PersonId", "Name", ...);

// easily add HTTP Headers
request.AddHeader("header", "value");

// add files to upload (works with compatible verbs)
request.AddFile("file", path);

// execute the request
IRestResponse response = client.Execute(request);
var content = response.Content; // raw content as string

// or automatically deserialize result
// return content type is sniffed but can be explicitly set via RestClient.AddHandler();
IRestResponse<Person> response2 = client.Execute<Person>(request);
var name = response2.Data.Name;

// or download and save file to disk
client.DownloadData(request).SaveAs(path);

// easy async support
await client.ExecuteAsync(request);

// async with deserialization
var asyncHandle = client.ExecuteAsync<Person>(request, response => {
    Console.WriteLine(response.Data.Name);
});

// abort the request on demand
asyncHandle.Abort();

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