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在嘗試上傳圖片時，我在OnActivityResult方法中遇到了2個問題，根據this。我該如何解決它們？ 
類的完整代碼：在OnActivityResult方法中選擇圖庫圖片的問題
public class AddNewTourActivity : Activity
{
GettingCountry gettingCountry = new GettingCountry();
private static int idOfChosenCountry, IdOfChosenCategory;
private static string status, promptMessage;
protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
SetContentView(Resource.Layout.AddNewTour);
//clearing lists
GettingCountry.listOfCountriesRoot.Clear();
GettingCountry.countriesList.Clear();
GettingCategories gc = new GettingCategories();
//Getting list of countries
gettingCountry.Fetch();
//clearing listCategoriesRoot
GettingCategories.categoriesList.Clear();
//getting categories method
gc.GetCategories();
Spinner categories_spinner = FindViewById<Spinner>(Resource.Id.categories_spinner);
Spinner countries = FindViewById<Spinner>(Resource.Id.countries);
//adapter
ArrayAdapter adapter = new ArrayAdapter<string>(this, Android.Resource.Layout.SimpleListItem1, GettingCategories.categoriesList);
ArrayAdapter adapterCountries = new ArrayAdapter<string>(this, Android.Resource.Layout.SimpleListItem1, GettingCountry.countriesList);
categories_spinner.Adapter = adapter;
countries.Adapter = adapterCountries;
countries.ItemSelected += Countries_ItemSelected;
categories_spinner.ItemSelected += Categories_spinner_ItemSelected;
//FindViewById<EditText>(Resource.Id.owner_id).Text = Login.user_id.ToString();
var title = FindViewById<EditText>(Resource.Id.title);
var image = FindViewById<ImageView>(Resource.Id.myImageView);
var location = FindViewById<EditText>(Resource.Id.location);
var description = FindViewById<EditText>(Resource.Id.description);
var price = FindViewById<EditText>(Resource.Id.price);
var min_capacity = FindViewById<EditText>(Resource.Id.min_capacity);
var max_capacity = FindViewById<EditText>(Resource.Id.max_capacity);
var duration = FindViewById<EditText>(Resource.Id.duration);
var meet_place_address = FindViewById<EditText>(Resource.Id.meet_place_address);
var meet_place_city = FindViewById<EditText>(Resource.Id.meet_place_city);
var lat = FindViewById<EditText>(Resource.Id.lat);
var lng = FindViewById<EditText>(Resource.Id.lng);
//uploading image
image.Click += Image_Click;
//uploading image ENDED
FindViewById<Button>(Resource.Id.add_tour_button).Click += delegate
{
//setting prompt message empty
promptMessage = "";
var client = new RestClient("http://api.locopal.com");
var request = new RestRequest("/experience", Method.POST);
//CHECKING THE CORRECTNESS OF THE USER'S INTRODUCTION TO ALL FIELDS
if (title.Text.Length < 3)
{
promptMessage += " Title must have at least 3 symbols.\n";
}
if (location.Text.Length < 3)
{
promptMessage += " Location must have at least 3 symbols.\n";
}
if (description.Text.Length < 30)
{
promptMessage += " Description length must be at least 30 symbols.\n";
}
//checking if price, capacity, etc... are integer values
int res;
bool priceIsInt = false;
priceIsInt = Int32.TryParse(price.Text, out res);
if (priceIsInt == false)
{
promptMessage += " Price must be an integer value.\n";
}
bool minCapacityIsInt = false;
minCapacityIsInt = Int32.TryParse(min_capacity.Text, out res);
if (minCapacityIsInt == false)
{
promptMessage += " Minimum capacity must be an integer value.\n";
}
bool maxCapacityIsInt = false;
maxCapacityIsInt = Int32.TryParse(max_capacity.Text, out res);
if (maxCapacityIsInt == false)
{
promptMessage += " Maximum capacity must be an integer value.\n";
}
bool durationIsInt = false;
durationIsInt = Int32.TryParse(duration.Text, out res);
if (durationIsInt == false)
{
promptMessage += " Duration must be an integer value.\n";
}
//checking if price, capacity, etc... are integer values ENDED
if (meet_place_address.Text.Length < 3)
{
promptMessage += " Address of meeting place must have at least 3 symbols.\n";
}
if (meet_place_city.Text.Length < 3)
{
promptMessage += " City of meeting place must have at least 3 symbols.\n";
}
//checking if lat and lng are doubles
double resDouble;
bool latIsDouble = false;
latIsDouble = Double.TryParse(lat.Text, out resDouble);
if (latIsDouble == false)
{
promptMessage += " Latitude must be a fractional value.\n";
}
bool lngIsDouble = false;
lngIsDouble = Double.TryParse(lng.Text, out resDouble);
if (lngIsDouble == false)
{
promptMessage += " Longitude must be a fractional value.";
}
//checking if lat and lng are doubles ENDED
//CHECKING THE CORRECTNESS OF THE USER'S INTRODUCTION TO ALL FIELDS ENDED
request.AddParameter("api_token", Login.token);
request.AddParameter("title", title.Text);
request.AddParameter("location", location.Text);
request.AddParameter("description", description.Text);
request.AddParameter("price", price.Text);
request.AddParameter("owner_id", Login.user_id);
request.AddParameter("min_capacity", min_capacity.Text);
request.AddParameter("max_capacity", max_capacity.Text);
request.AddParameter("duration", duration.Text);
request.AddParameter("duration_type", 1);
request.AddParameter("meet_place_address", meet_place_address.Text);
request.AddParameter("meet_place_city", meet_place_city.Text);
request.AddParameter("meet_place_country", idOfChosenCountry);
request.AddParameter("category_list[0]", IdOfChosenCategory);
request.AddParameter("lat", lat.Text);
request.AddParameter("lng", lng.Text);
try
{
IRestResponse response = client.Execute(request);
var content = response.Content;
var myContent = JObject.Parse(content);
status = myContent["status"].ToString();
}
catch { }
if (status == "success")
{
Toast.MakeText(this, "Tour added successfully", ToastLength.Short).Show();
//setting status variable to null to prevent issues with adding new places in future
status = null;
StartActivity(typeof(MainActivity));
}
else
{
Toast.MakeText(this, promptMessage, ToastLength.Long).Show();
}
};
}
private void Image_Click(object sender, EventArgs e)
{
var imageIntent = new Intent();
imageIntent.SetType("image/*");
imageIntent.SetAction(Intent.ActionGetContent);
StartActivityForResult(
Intent.CreateChooser(imageIntent, "Select photo"), 0);
}
private void Categories_spinner_ItemSelected(object sender, AdapterView.ItemSelectedEventArgs e)
{
IdOfChosenCategory = e.Position;
}
private void Countries_ItemSelected(object sender, AdapterView.ItemSelectedEventArgs e)
{
idOfChosenCountry = gettingCountry.retrievingChoosenCountryId(GettingCountry.countriesList[e.Position].ToString());
}
protected override void OnActivityResult(int requestCode, Result resultCode, Intent data)
{
base.OnActivityResult(requestCode, resultCode, data);
if (resultCode == Result.Ok)
{
var imageView = FindViewById<ImageView>(Resource.Id.myImageView);
imageView.SetImageURI(data.Data);
}
}
}