Question

我正在调用API Post方法，但是，我不确定我做错了什么，但API中的值始终为null。我调用API的方法如下。当我点击这个时，我可以看到Ids是包含5个值的整数列表。

private void Save(List<int> Ids)
{
  var myAPI = ConfigurationManager.AppSettings["MyAPI"];

  string myIds = string.Join(",", Ids);

  using (var client = new HttpClient())
  {

    int result = client.PostAsync(myAPI, new { test = myIds }, new JsonMediaTypeFormatter())
                        .Result
                        .Content
                        .ReadAsAsync<int>()
                        .Result;
  }
}

我的API签名如下所示 - 有一个断点我可以看到它被击中但是测试我想要传递的参数总是为空

    [HttpPost]
    [Route("api/MyController/SaveData")]
    public HttpResponseMessage SaveData([FromBody]List<string> test)
    {
        try
        {
        //Rest of method removed for brevity

我尝试从WebAPI控制器中删除[FromBody] Annotation但是在SaveData API方法中测试仍然是使用断点获取

Answer 1

试试这个：

private void Save(List<int> Ids)
{
    var myAPI = ConfigurationManager.AppSettings["MyAPI"];

    using (var client = new HttpClient())
    {
        var requestBody = JsonConvert.SerializeObject(Ids);
        var postRequest = new StringContent(requestBody, Encoding.UTF8, "application/json");

        var response = client.PostAsync(myAPI, postRequest).GetAwaiter().GetResult();
        var rawResponse = response.Content.ReadAsStringAsync().GetAwaiter().GetResult();
        // Do something with the answer
    }
}

我还建议制作方法private Task Save并在调用前用.GetAwaiter().GetResult();替换await。

Answer 2

在我的情况下，我使用System.Web.Http.ApiController而不是System.Web.Mvc.Controller。因此，所有代码看起来像

public class YourAppController : ApiController
{
    [System.Web.Http.Route("publish-message")]
    public HttpResponseMessage Post([System.Web.Http.FromBody] string msges)
    {
        //Your Code
        return Request.CreateResponse(HttpStatusCode.OK, "");

    }
}


public async Task<string> PublishMessageCall(string publishMessage){                
        var returnval = "";
        string httpWebRqst = "http://localhost:543134535/publish-message";

        using (HttpClient myClient = new HttpClient())
        {
            var jsonString = JsonConvert.SerializeObject(publishMessage);
            var content = new StringContent(jsonString, Encoding.UTF8, "application/json");

            var response = await myClient.PostAsync(httpWebRqst, content);

            var responseString = await response.Content.ReadAsStringAsync();

        }
        return await Task.FromResult(returnval);}

PostAsync参数始终为null

2 个答案: