Question

我想要调用服务器，获取JSON结果并将结果返回给调用方法。下面是我调用服务器的代码：

public async Task<Dictionary<string,string>> callAjax(string mthd,Dictionary<string,string> values)
{
    HttpClient client = new HttpClient();

    var content = new FormUrlEncodedContent(values);
    var response = await client.PostAsync("http://dev.adex-intl.com/adex/mvc/receiving/"+mthd, content);
    var responseString = await response.Content.ReadAsStringAsync();
    Dictionary<string,string> result = JsonConvert.DeserializeObject<Dictionary<string, string>>((string)responseString);
    return result;
}

这是调用上述方法的代码：

public void loginPressed(object sender, EventArgs e)
    {
        if(String.IsNullOrEmpty(badge.Text)) {
            DisplayAlert("Error", "Enter your badge number", "Ok");
        } else {
            IsBusy = true;
            var parameters = new Dictionary<string, string>
            {
               { "badgeNumber", badge.Text }
            };
            GlobalMethods globalMethods = new GlobalMethods();
            Dictionary<string,string> results = globalMethods.callAjax("login", parameters);
            var id = results["userid"].ToString();
        }
    }

我收到编译错误“无法隐式转换类型'System.Threading.Tasks.Task'”行“Dictionary results = globalMethods.callAjax（”login“，parameters）;”

Answer 1

callAjax是一种异步方法，因此在调用它时需要使用await

Dictionary<string,string> results = await globalMethods.callAjax("login", parameters);

Xamarin无法转换System.Threading.Tasks

1 个答案: