Thirdparty API invoke from Web Service (ASMX)

Question

I've got a scenario to invoke an API from a third party application. But since the request is by using HTTPClient, its async and thus I'm not able to return correct value to Ajax request.

Here is my code

    [WebMethod]
    public string getSampleData()
    {

        string url = "https://api.thirdparty.com/eport/?Key=200&resultsPerPage=1000";


        using (HttpClient client = new HttpClient(new HttpClientHandler())) 
        {
            var plainTextBytes = System.Text.Encoding.UTF8.GetBytes("sabcd@test.com:TEst12345");// ("sabcd@test.com:Pwd123"); 
            string val = System.Convert.ToBase64String(plainTextBytes);
            client.DefaultRequestHeaders.Add("Authorization", "Basic " + val);

            ServicePointManager.Expect100Continue = true;
            ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls12;

            try
            {
                using (HttpResponseMessage response = await client.GetAsync(url))
                {
                    response.EnsureSuccessStatusCode();
                    string responseBody = await response.Content.ReadAsStringAsync();
                    string k = responseBody;
                    return k;
                }
                return "";
            }
            catch (Exception ex)
            {
                return ex.Message;
            }


        }


    }

But it simply triggering error since await does not work there. So how can I deal with the situation wisely without any trouble.

Here is my AJAX call $('#btn_keyedin').click(function () {

        $.ajax({
            url: '../webservice1.asmx/getSampleData',
            type: 'POST',
            contentType: 'application/json',
            datatype: 'JSON',
            success: function (data) {
                console.log(JSON.stringify(data));
            },
            error: function () {
            }
        });
    });

Please help to solve this trouble

Answer 1

await keyword can only be used in async methods. As far as I know, WebMethod cannot be async. You will have to change your await s to .Result or as other people said .GetAwaiter().GetResult() .