How to convert image to base64 string in Windows Phone? - windows-phone-7

Question

I am developing a windows phone application in which I have to convert image to base64 string and I have to pass that string through Web Service. So I tried many Ways, but I cant able to send it as everytime I am getting error as "Target Invocation error". With this code I can choose the image from library but I cant send through web service.
I used the following code to covert the image:
private void photoChooserTask_Completed(object sender, PhotoResult e)
{
BitmapImage image = new BitmapImage();
image.SetSource(e.ChosenPhoto);
this.imageTribute.Source = image;
byte[] bytearray = null;
using (MemoryStream ms = new MemoryStream())
{
if (imageTribute.Source == null)
{
}
else
{
WriteableBitmap wbitmp = new WriteableBitmap((BitmapImage)imageTribute.Source);
wbitmp.SaveJpeg(ms, 40, 40, 0, 82);
bytearray = ms.ToArray();
}
}
strimage = Convert.ToBase64String(bytearray);
}
So please if anyone knows about that, help me out. Thanx in advance.
EDIT
void uploadphoto()
{
WebClient webClient1 = new WebClient();
webClient1.DownloadStringCompleted += new DownloadStringCompletedEventHandler(webClient1_DownloadStringCompleted);
webClient1.DownloadStringAsync(new Uri("Web Service"));
}
void webClient1_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
{
var rootobject1 = JsonConvert.DeserializeObject<RootObject1>(e.Result);
int error = rootobject1.response.errorFlag;
string message = rootobject1.response.msg;
if (error == 0)
{
MessageBox.Show(message);
}
else
{
MessageBox.Show(message);
}
}
public class Response1
{
public int errorFlag { get; set; }
public string msg { get; set; }
public List<string> uploadedImageNames { get; set; }
}
public class RootObject1
{
public Response1 response { get; set; }
}
private void ImageUpload(object sender, RoutedEventArgs e)
{
//MessageBoxResult mb = MessageBox.Show("Select the mode of uploading the picture", "", MessageBoxButton.OKCancel);
Popup popup = new Popup();
photoSelection photo = new photoSelection();
popup.Child = photo;
popup.IsOpen = true;
photo.camera.Click += (s, args) =>
{
photoCameraCapture.Show();
popup.IsOpen = false;
};
photo.library.Click += (s, args) =>
{
photoChooserTask.Show();
popup.IsOpen = false;
};
}
EDIT
Here I uploaded the stack trace of my error. So please check and reply me.

Answer 1

A Target Invocation Exception error tells you that the application crashed while invoking a method which could be many things. The real error is in the InnerException.
Look at the InnerException property of the TargetInvocationException object. This will show you the stack trace and the actual error thrown.

Answer 2

Get your file into stream either from resource or from isolatedStorage
//getting file from resource
var resource = Application.GetResourceStream(new Uri("image.jpg", UriKind.Relative));
//get Stream Data
StreamReader streamReader = new StreamReader(resource.Stream);
//initializing bytearray to stream length
byte[] imageData = new byte[streamReader.Length];
//wriing from stream to imagdata
streamReader.Read(imageData, 0, imageData.Length);
streamReader.Close();
Use isolatedStorageFile to read from isolated storage
now you have your image data in imageData and to convert it into base64 use:
var baseString = Convert.ToBase64String(imageData);