C# 如何使用 rest web 服务

Question

我在 C# 中尝试使用休息 Web 服务时遇到问题。

当我通过 Fiddler 尝试时，它工作正常。当我通过 HTML/Ajax 尝试时，它也工作正常。

当我尝试通过 C#（控制台应用程序）时出现错误。

此图像是在 fiddler 中捕获的。这是我通过 ajax 尝试时得到的

此图像也是在 fiddler 中捕获的。这是我通过 C# 尝试时得到的

如您所见，JSON 字段为空。

这是我的 C# 代码

            string json = JsonConvert.SerializeObject(abc);

        HttpClient client = new HttpClient();
        client.BaseAddress = new Uri("MyURL");  //==> I am filling it correctly
        client.DefaultRequestHeaders.Accept.Add(
           new MediaTypeWithQualityHeaderValue("application/json"));

        var response = client.PostAsJsonAsync("MyMethod", json).Result; //==> I am filling my method correctly

但是我已经尝试了其他几个并且总是遇到同样的问题。（下面的代码是我试过的另一个）

var requisicaoWeb = WebRequest.CreateHttp("MyURL");
        requisicaoWeb.Method = "POST";
        requisicaoWeb.ContentType = "application/json";
        requisicaoWeb.ContentLength = dados.Length;
        requisicaoWeb.UserAgent = "Console app";
        requisicaoWeb.Accept = "Accept:application/json,text/javascript,*/*;q=0.01";


        //precisamos escrever os dados post para o stream
        using (var stream = requisicaoWeb.GetRequestStream())
        {
            stream.Write(MyJson, 0, dados.Length);
            stream.Close();
        }
        //ler e exibir a resposta
        using (var resposta = requisicaoWeb.GetResponse())
        {
            var streamDados = resposta.GetResponseStream();
            StreamReader reader = new StreamReader(streamDados);
            object objResponse = reader.ReadToEnd();
            var post = objResponse.ToString();//JsonConvert.DeserializeObject<Post>(objResponse.ToString());
            streamDados.Close();
            resposta.Close();
        }

我在 C# 中尝试的一切，Fiddler 上的 JSON 字段总是空的，"syntax View" 描述总是 "Request Invalid"。

Answer 1

试一试；

public static string HttpPost(string URI, string Parameters)
{
    System.Net.WebRequest req = System.Net.WebRequest.Create(URI);

    req.ContentType = "application/json; charset=utf-8";
    req.Method = "POST";
    req.Timeout = 600000;
    byte[] bytes = System.Text.Encoding.ASCII.GetBytes(Parameters);
    req.ContentLength = bytes.Length;
    System.IO.Stream os = req.GetRequestStream();
    os.Write(bytes, 0, bytes.Length);
    os.Close();
    System.Net.WebResponse resp = req.GetResponse();
    if (resp == null)
        return null;
    System.IO.StreamReader sr = new System.IO.StreamReader(resp.GetResponseStream());
    return sr.ReadToEnd().Trim();
}

Answer 2

刚刚弄明白了

如果其他人有同样的问题，这里是答案

 string json = JsonConvert.SerializeObject(abc);

        HttpClient client = new HttpClient();
        client.BaseAddress = new Uri("MyURL");  //==> I am filling it correctly
        client.DefaultRequestHeaders.Accept.Add(
           new MediaTypeWithQualityHeaderValue("application/json"));

        var stringContent = new StringContent(JsonConvert.SerializeObject(abc), Encoding.UTF8, "application/json"); 

        var response = client.PostAsync("MyURL", stringContent).Result; //==> I am filling my method correctly

C# 如何使用 rest web 服务

C# how to consume rest web service

c#

rest

webclient

http

fiddler