Question

我有一个API，并且在WindowsForm中调用它时出现“请求不能为空”错误。我怎么称呼Windows Form

    [HttpGet]
    [Route("")]
    public HttpResponseMessage GetNearBeacons()
    {
        try
        {
            return Request.CreateResponse(HttpStatusCode.OK, repoNear.List());
        }
        catch (Exception exp)
        {
            return Request.CreateErrorResponse(HttpStatusCode.ExpectationFailed, exp);
        }
    }

通话代码

public void Test(){
            BeaconController beaconController = new BeaconController();

            beaconController.GetNearBeacons();
}

Answer 1

您可以从Jquery Ajax调用api。像这样的东西：

$.ajax({
       url: '../api/ControllerName/GetNearBeacons',
       type: 'GET',
       success: function (response) {
       },
       error: function (response) {
       }
     });

Answer 2

我想您正在使用Web API，您在做什么是错误调用API的方式。

Web API是可以通过 HTTP 协议访问的Web API，可以从其他应用程序访问。

您会在下面找到使用邮递员调用Web API的示例，或者您可以使用浏览器将它作为 get 动词就足够了（对于启动Web api时的主机名，它显示在您的浏览器localhost：端口号）

Answer 3

    private void TestApi()
    {
        try
        {
                 using (var httpClient = new HttpClient())
                {

                    string URI = string.Empty;

                    string progressAPI = "api/GetNearBeacons";

                    var baseUrl = @"http://localhost/sample";

                    var uriBuilder = new UriBuilder(baseUrl)
                    {
                        Scheme = Uri.UriSchemeHttp
                    };

                    httpClient.BaseAddress = uriBuilder.Uri;

                    httpClient.DefaultRequestHeaders.Accept.Clear();

                    httpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

                    HttpResponseMessage response = httpClient.GetAsync(progressAPI).Result;

                    response.EnsureSuccessStatusCode();

                    if (response.IsSuccessStatusCode)
                    {
                        WriteErrorLog("Api called successfully StatusCode :" + response.StatusCode + Environment.NewLine);
                    }
                    else
                    {
                        WriteErrorLog("Api Calling Failed StatusCode :" + response.StatusCode + Environment.NewLine);
                    }
                }

        }
        catch (WebException ex)
        {
            WriteErrorLog(ex.GetBaseException().ToString());
        }
        catch (Exception ex)
        {
            WriteErrorLog(ex.GetBaseException().ToString());
        }
    }

如何使用C＃调用api

3 个答案: