Hello everybody , i use ASMX WebService with Xamarin.Forms , and i have two Methods in Web service , one Method returns String Value and the Other one returns Double , when i try these two methods with firefox (or any other internet Browser) , both methods work fine , but when i call those two method by Xamarin.forms , the one which returns double works fine ,but the other one with string value raises exception Error
Unhandled Exception:
System.Reflection.TargetInvocationException: An exception occurred during the operation, making the result invalid. Check InnerException for exception details.
where are my Web service Methods
{
[WebMethod]
public string ReturnString()
{
return "String Value Returned";
}
[WebMethod] public double ReturnDouble() { return 5.500; }
}
And here is my Xamarin.forms Code
{
public MainPage()
{
InitializeComponent();
BtReturnString.Clicked += BtReturnString_Clicked; BtReturnDouble.Clicked += BtReturnDouble_Clicked; } private void BtReturnDouble_Clicked(object sender, EventArgs e) { ServiceReference1.WebService1SoapClient WS = new ServiceReference1.WebService1SoapClient(); WS.ReturnDoubleAsync(); WS.ReturnDoubleCompleted += WS_ReturnDoubleCompleted; } private void WS_ReturnDoubleCompleted(object sender, ServiceReference1.ReturnDoubleCompletedEventArgs e) { Device.BeginInvokeOnMainThread(() => { Result1.Text = e.Result.ToString(); }); } private void BtReturnString_Clicked(object sender, EventArgs e) { ServiceReference1.WebService1SoapClient WS = new ServiceReference1.WebService1SoapClient(); WS.ReturnStringAsync(); WS.ReturnStringCompleted += WS_ReturnStringCompleted; } private void WS_ReturnStringCompleted(object sender, ServiceReference1.ReturnStringCompletedEventArgs e) { Device.BeginInvokeOnMainThread(() => { Result1.Text = e.Result.ToString(); }); }
}
any help please ?????
Answers
Not that this helps with the issue with the web service call not working but you should set the completed event handler before you call the method. I also prefer to use await for calling the service it is much cleaner looking code
for example
Thank u for you reply ,but i have changed to API REST ,i think it is more stable with xamarin.forms , and i am doing good so far. Thank u again