Call HttpWebRequest in another thread as UI with Task class - avoid to dispose object created in Task scope
- by John
I would like call HttpWebRequest on another thread as UI, because I must make 200 request or server and downloaded image.
My scenation is that I make a request on server, create image and return image. This I make in another thread. I use Task class, but it call automaticaly Dispose method on all object created in task scope. So I return null object from this method.
public BitmapImage CreateAvatar(Uri imageUri, int sex)
{
if (imageUri == null)
return CreateDefaultAvatar(sex);
BitmapImage image = null;
new Task(() =>
{
var request = WebRequest.Create(imageUri);
var response = request.GetResponse();
using (var stream = response.GetResponseStream())
{
Byte[] buffer = new Byte[response.ContentLength];
int offset = 0, actuallyRead = 0;
do
{
actuallyRead = stream.Read(buffer, offset, buffer.Length - offset);
offset += actuallyRead;
} while (actuallyRead > 0);
image = new BitmapImage
{
CreateOptions = BitmapCreateOptions.None,
CacheOption = BitmapCacheOption.OnLoad
};
image.BeginInit();
image.StreamSource = new MemoryStream(buffer);
image.EndInit();
image.Freeze();
}
}).Start();
return image;
}
How avoid it? Thank
Mr. Jon Skeet try this:
private Stream GetImageStream(Uri imageUri)
{
Byte[] buffer = null;
//new Task(() =>
//{
var request = WebRequest.Create(imageUri);
var response = request.GetResponse();
using (var stream = response.GetResponseStream())
{
buffer= new Byte[response.ContentLength];
int offset = 0, actuallyRead = 0;
do
{
actuallyRead = stream.Read(buffer, offset, buffer.Length - offset);
offset += actuallyRead;
} while (actuallyRead > 0);
}
//}).Start();
return new MemoryStream(buffer);
}
It return object which is null a than try this:
private Stream GetImageStream(Uri imageUri)
{
Byte[] buffer = null;
new Task(() =>
{
var request = WebRequest.Create(imageUri);
var response = request.GetResponse();
using (var stream = response.GetResponseStream())
{
buffer= new Byte[response.ContentLength];
int offset = 0, actuallyRead = 0;
do
{
actuallyRead = stream.Read(buffer, offset, buffer.Length - offset);
offset += actuallyRead;
} while (actuallyRead > 0);
}
}).Start();
return new MemoryStream(buffer);
}
Method above return null
