c#使用xamarin编写拨打电话程序

callButton.Click += (object sender, EventArgs e) =>{  // On "Call" button click, try to dial phone number. sharejs.com  var callDialog = new AlertDialog.Builder(this);  callDialog.SetMessage("Call " + translatedNumber + "?");  callDialog.SetNeutralButton("Call", delegate {      // Create intent to dial phone      var callIntent = new Intent(Intent.ActionCall);      callIntent.SetData(Android.Net.Uri.Parse("tel:" + translatedNumber));      StartActivity(callIntent);    });  callDialog.SetNegativeButton("Cancel", delegate { });   // Show the alert dialog to the user and wait for response.  callDialog.Show();};