Problems running Class Library Async

Question

Hello everyone and thanks for the help in advance. I am developing a class library that uses the HttpClient to interface with a device uploading and downloading data to the device. I am developing this as a class library because several devices in our environment need to be able to interface with this device, so the code must be reusable. One of the classes looks like:

public class RaiseConnectionDialogHttp     {         public async Task<string> RaiseConnectionDialog()         {             string statusCode = "";                 HttpClientHandler handler = new HttpClientHandler { Credentials = new NetworkCredential(UserName, Password) };                 handler.ServerCertificateCustomValidationCallback = (message, cert, chain, errors) => true;                 var data = new StringContent("");                               using (var client = new HttpClient(handler))                 {                     var response = await client.PostAsync(url, data);                     statusCode = response.StatusCode.ToString();                     var result = await response.Content.ReadAsStringAsync();                  }                         return statusCode;

However, when I try to call the class from an application:

                RaiseConnectionDialogHttp raiseConnectionDialogHttp = new RaiseConnectionDialogHttp();
                string resp = raiseConnectionDialogHttp.RaiseConnectionDialog().ToString();
                MessageBox.Show(resp);

I receive system.runtime.compilerservices.asynctaskmethodbuilder. Not sure how to fix this.

Answer 1

@Kmcnet, Welcome to Microsoft Q&A, based on my research, we need to wait for response to get output.

I used winform app to test it.

 private async void button1_Click(object sender, EventArgs e)
        {
            RaiseConnectionDialogHttp raiseConnectionDialogHttp = new RaiseConnectionDialogHttp();
            string resp = await raiseConnectionDialogHttp.RaiseConnectionDialog();
            MessageBox.Show(resp);
        }

Result:

Hope my solution could be helpful for you.

Best Regards,

Jack

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