c# - 如何在 C# 中使用 rest api

Question

我想在我的项目 (web)/Windows 服务 (C#) 中使用具有 post 方法的 rest api。

Url : https://sampleurl.com/api1/token

我需要传递用户名和密码来生成 token 。我写过这样的代码。

string sURL = "https://sampleurl.com/api1/token/Actualusername/Actualpassword";
            WebRequest wrGETURL;
            wrGETURL = WebRequest.Create(sURL);

            wrGETURL.Method = "POST";
            wrGETURL.ContentType = @"application/json; charset=utf-8";
            wrGETURL.ContentLength = 0;
            HttpWebResponse webresponse = wrGETURL.GetResponse() as HttpWebResponse;

            Encoding enc = System.Text.Encoding.GetEncoding("utf-8");
            // read response stream from response object
            StreamReader loResponseStream = new StreamReader(webresponse.GetResponseStream(), enc);
            // read string from stream data
            string  strResult = loResponseStream.ReadToEnd();
            // close the stream object
            loResponseStream.Close();
            // close the response object
            webresponse.Close();

            Response.Write(strResult);

我收到错误:无法建立连接，因为目标机器主动拒绝了它

在 C# 中使用 rest api 是正确的方法吗？

Answer 1

这在很大程度上取决于 API 的文档，而是将数据写入请求主体，获取请求流，然后将字符串写入流。同样，这取决于您使用什么 API 进行身份验证，而我不知道哪个是我的猜测。

        string sURL = "https://sampleurl.com/api1/token";
        WebRequest wrGETURL;
        wrGETURL = WebRequest.Create(sURL);

        wrGETURL.Method = "POST";
        wrGETURL.ContentType = @"application/json; charset=utf-8";
        using (var stream = new StreamWriter(wrGETURL.GetRequestStream()))
        {
            var bodyContent = new
            {
                username = "Actualusername",
                password = "Actualpassword"
            }; // This will need to be changed to an actual class after finding what the specification sheet requires.

            var json = JsonConvert.SerializeObject(bodyContent);

            stream.Write(json);
        }
        HttpWebResponse webresponse = wrGETURL.GetResponse() as HttpWebResponse;

        Encoding enc = System.Text.Encoding.GetEncoding("utf-8");
        // read response stream from response object
        StreamReader loResponseStream = new StreamReader(webresponse.GetResponseStream(), enc);
        // read string from stream data
        string strResult = loResponseStream.ReadToEnd();
        // close the stream object
        loResponseStream.Close();
        // close the response object
        webresponse.Close();

        Response.Write(strResult);