Early this year I wrote a post about creating a File Uploader using Silverlight and WCF. And today I got a question from one forum, about to create uploader for multiple files. And here is source code, I am just modified my eariler source code slightly to select multiple file.
OpenFileDialog openFileDialog = new OpenFileDialog();
//Hard coding filter - You can read it from client side too.
openFileDialog.Filter = "Image Files|*.jpg;*.bmp;*.png";
openFileDialog.Multiselect = true;
bool? result = openFileDialog.ShowDialog();
if (result.HasValue && result.Value)
{
spProgress.Visibility = System.Windows.Visibility.Visible;
Service1Client client = new Service1Client();
client.DoUploadCompleted += (o, p) =>
{
if (p.Error != null)
{
MessageBox.Show(p.Error.Message);
}
else
{
MessageBox.Show("Done");
}
};
client.DoUploadAsync(CreateUploadData(openFileDialog.Files));
client.CloseAsync();
}
And here is the helper methods.
private Dictionary<string, byte[]> CreateUploadData(IEnumerable<FileInfo> infos)
{
var files = new Dictionary<string, byte[]>();
foreach (var fileInfo in infos)
{
files.Add(fileInfo.Name, ReadFileContents(fileInfo.OpenRead()));
}
return files;
}
private byte[] ReadFileContents(Stream stream)
{
using (Stream sr = stream)
{
byte[] contents = new byte[sr.Length];
sr.Read(contents, 0, contents.Length);
return contents;
}
}
And here is the change in WCF Service.
[OperationContract]
public void DoUpload(Dictionary<string, byte[]> files)
{
string folder = @"C:\Uploads";
foreach (var file in files)
{
using (FileStream sw = File.OpenWrite(Path.Combine(folder, file.Key)))
{
sw.Write(file.Value, 0, file.Value.Length);
}
}
return;
}
Sometimes if you are uploading too many files with large size, you may get some error like Not Found, maxArrayLength exceeded. You can fix this error by addingin the web.config file.
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