c# - MVC API 在正文中发送数据

Question

我正在尝试将数据发送到使用 Postman 可以正常工作的 API，但我不确定如何在代码中执行此操作。

我创建了这个使用测试 json 字符串的方法，它发送正文中的数据。当我调试它时，错误来自这一行

HttpWebResponse response = (HttpWebResponse)request.GetResponse();

我收到消息

The remote server returned an error: (400) Bad Request.'"

任何帮助都会很大，不确定我做错了什么。

public static T Post<T>(string httpMethod, string url, object model)
        {
            var fullUrl = apiUrl + url;

            var json = "{\"FirstName\":\"1\",\"LastName\":\"1\"}";


            string data = json;

            Stream dataStream = null;
            WebRequest Webrequest;
            Webrequest = WebRequest.Create(fullUrl);


            Webrequest.ContentType = "application/json";
            Webrequest.Method = WebRequestMethods.Http.Post;

            Webrequest.PreAuthenticate = true;
            Webrequest.Headers.Add("Authorization", "Bearer Toeke n");

            byte[] byteArray = Encoding.UTF8.GetBytes(data);

            Webrequest.ContentLength = byteArray.Length;

            dataStream = Webrequest.GetRequestStream();

            using (dataStream = Webrequest.GetRequestStream())
            {
                dataStream.Write(byteArray, 0, byteArray.Length);
            }

            WebResponse response = Webrequest.GetResponse();
    }

API

 [HttpPost]
        public IHttpActionResult SaveForm(RequestWeb Request)

postman 原始

{
    "FirstName": "1",
    "LastName": "1",
}

Answer 1

您使用 WebRequest 而不是 HttpClient 有什么具体原因吗？如果您不执行任何 FTP 工作并且使用 .NET Framework 4.5+ 或 .NET Core，那么最好迁移到 HttpClient 因为它为您提供了更轻松的使用流程，提供开箱即用的异步支持，并且更容易模拟和测试，同时为您提供更多功能。总的来说，它是用于从 .NET 发出请求的现代 API。

public async Task<T> Post<T>(object model) // use actual model type instead of type object
{
    var url = "Specify URL";
    var token = "Specify Token";

    var payload = JsonSerializer.Serialize(model);

    // Preferably get the instance from dependency injection or hoist it as a private variable in the class body.
    // In any case, don't recreate it like we're doing here.
    var client = new HttpClient();

    var requestMessage = new HttpRequestMessage(HttpMethod.Post, url);

    requestMessage.Headers.Add("Authorization", $"Bearer {token}");
    requestMessage.Content = new StringContent(payload, Encoding.UTF8, "application/json");

    var responseMessage = await client.SendAsync(requestMessage);

    if (responseMessage.IsSuccessStatusCode)
    {
        var result = await responseMessage.Content.ReadAsStringAsync();

        return JsonSerializer.Deserialize<T>(result);
    }
    else
    {
        // Handle error result
        throw new Exception();
    }            
}