.Net MVC 中使用 HttpClient 的 Json 对象序列化

Question

我正在尝试将我的模型序列化为 Json 以进行 POST 请求，但每次发出请求时，由于非序列化对象，它会给出 400 Bad Request。

public class AppVersionModel
{
    public Project project { get; set; }

    public String active { get; set; }

    public String createdBy { get; set; }

    public String description { get; set; }

    public String name { get; set; }


    public String obfuscatedId { get; set; }

    public String owner { get; set; }



    /*public String AppName { get; set; }
    public String AppVersion { get; set; }
    public int AppId { get; set; }

    public String Description{ get; set; }

    public String DescriptionForApp { get; set; }

    public String DescriptionForVersion { get; set; }

    public String DevPhase { get; set; }

    public String DevStrategy { get; set; }

    public String IssueTemplate { get; set; }

    public String UserName { get; set; }*/

}


public class Project
{
    /*public String createdBy { get; set; }*/
    [JsonIgnore]
    public String description { get; set; }

    [JsonIgnore]
    public String issueTemplateId { get; set; }

    [JsonIgnore]
    public String name { get; set; }
}

控制器如下。

[System.Web.Mvc.HttpPost]
    public ActionResult onboard([FromUri] AppVersionModel appVersionModel)
    {
        using (var client = new HttpClient())
        {
            client.BaseAddress = new Uri("<any url>");
            client.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Basic", Convert.ToBase64String(Encoding.UTF8.GetBytes($"{username}:{password}")));
            client.DefaultRequestHeaders.Accept.Add(new System.Net.Http.Headers.MediaTypeWithQualityHeaderValue("application/json"));
            client.DefaultRequestHeaders.Accept.Clear();

            //HTTP POST
            try
            {

                /*string json = JsonConvert.SerializeObject(appVersionModel);*/
                var postTask = client.PostAsJsonAsync<AppVersionModel>("projectVersions",appVersionModel);

                /*var postTask = client.PostAsJsonAsync<AppVersionModel>("appVersionModel", appVersionModel);*/
                postTask.Wait();
                var result = postTask.Result;
                if (result.IsSuccessStatusCode)
                {
                    return RedirectToAction("Home/Index");
                }
                else if (result.StatusCode == System.Net.HttpStatusCode.Unauthorized)
                {
                    ModelState.AddModelError(string.Empty, "Authentication Error. Please contact administrator.");
                    return View(appVersionModel);
                }

                ModelState.AddModelError(string.Empty, "Server Error. Please contact administrator.");
            }
            catch (HttpException ex)
            {
                ModelState.AddModelError(string.Empty, "Exception Occured in Http Request.");

            }


            return View(appVersionModel);


        }

    }

我收到 400 Bad Request Error，我的理解是，作为一种复杂类型的模型对象，即“项目”，因此它没有序列化模型对象，因此请求没有获得所需的请求正文。

任何人都可以在这方面帮助我。

Answer 1

删除这一行：

client.DefaultRequestHeaders.Accept.Clear();

你应该像这样PostAsync()：

var result = await client.PostAsync("projectVersions", 
                    new StringContent(JsonConvert.SerializeObject(appVersionModel,Encoding.UTF8, "application/json");

最终代码为：

    public ActionResult onboard([FromUri] AppVersionModel appVersionModel)
    {
        using (var client = new HttpClient())
        {
            client.BaseAddress = new Uri("<any url>");
            client.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Basic", Convert.ToBase64String(Encoding.UTF8.GetBytes($"{username}:{password}")));
            client.DefaultRequestHeaders.Accept.Add(new System.Net.Http.Headers.MediaTypeWithQualityHeaderValue("application/json"));

            try
            {
                var result = await client.PostAsync("projectVersions",
                    new StringContent(JsonConvert.SerializeObject(appVersionModel, Encoding.UTF8, "application/json");

                if (result.IsSuccessStatusCode)
                {
                    return RedirectToAction("Home/Index");
                }
                else if (result.StatusCode == System.Net.HttpStatusCode.Unauthorized)
                {
                    ModelState.AddModelError(string.Empty, "Authentication Error. Please contact administrator.");
                    return View(appVersionModel);
                }

                ModelState.AddModelError(string.Empty, "Server Error. Please contact administrator.");
            }
            catch (HttpException ex)
            {
                ModelState.AddModelError(string.Empty, "Exception Occured in Http Request.");
            }
        }
        return View(appVersionModel);
    }