如何使用C＃进行此CURL请求？

Question

我花了几周时间尝试从C＃向API发出POST请求，但没有成功。官方文档提供的示例如下：

curl -v -u MYTOKEN:api_token \
-H "Content-Type: application/json" \
-d '{"object":{"param1":"a","param2":2,"param3":3,"param4":true,"param5":5}}' \
-X POST APIURL

这是我目前正在尝试执行请求的方式

var webAddr = "APIURL";
        var httpWebRequest = (HttpWebRequest)WebRequest.Create(webAddr);
        httpWebRequest.ContentType = "application/json";
        httpWebRequest.Method = "POST";
        httpWebRequest.Credentials = new NetworkCredential("MYTOKEN", "api_token");

        using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
        {
            string json = "{\"object\":{\"param1\":\"a\",\"param2\":2,\"param3\":3,\"param4\":true,\"param5\":5}}";

            streamWriter.Write(json);
            streamWriter.Flush();
        }
        try
        {
            var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
            using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
            {
                var result = streamReader.ReadToEnd();
                Console.WriteLine(result);
            }
        }
        catch(Exception e)
        {
            Console.WriteLine(e);
        }

我已经在Linux终端中使用CURL测试了请求，它运行正常，所以这不是问题。

我得到的错误是403“禁止”。文档说明凭证将与令牌一起用作用户名，“api_token”用作密码。

谢谢！