Silverlight File Upload Component
This Silverlight File Upload component will help you build a UI with File Upload capability with the minimum amount of coding, the example we have on this page uses the Progress Bar control to give you a visual representation of the upload progress though as the File Upload is a separate component you can implement any UI you like for it.
To use the File Upload Component you will need to add a reference to Liquid.Components.dll in your project.
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How to Use the File Upload Component
To demonstrate the File Upload component we will build a simple upload page containing a Progress Bar and a file browse button, the browse dialog is a standard Silverlight dialog and allows the user to select 1 or many files. In your Silverlight XAML:
<UserControl x:Class="FileUpload.Page"
xmlns="http://schemas.microsoft.com/client/2007"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:liquid="clr-namespace:Liquid;assembly=Liquid"
Width="400" Height="300">
<Canvas>
<liquid:ProgressBarPlus x:Name="progress" Canvas.Left="8" Canvas.Top="8" Width="200" Height="24" />
<Button x:Name="startUpload" Canvas.Left="80" Canvas.Top="50" Content="Upload" Width="60" Height="32" Click="StartUpload_Click" />
</Canvas>
</UserControl>
In your C# code behind file you will actually get to use the Upload component to upload the selected files and to maintain the progress bar with the upload progress.
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Windows.Browser;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using Liquid;
using Liquid.Components;
namespace FileUpload
{
public partial class Page : UserControl
{
private Uploader _uploader = new Uploader("http://localhost/vectorlight/FileUploadService.asmx");
public Page()
{
InitializeComponent();
_uploader.UploadProgressChange += new UploadEventHandler(Uploader_UploadProgressChange);
_uploader.UploadFinished += new UploadEventHandler(Uploader_UploadFinished);
}
private void Uploader_UploadFinished(object sender, UploadEventArgs e)
{
progress.Text = "Complete.";
progress.Complete = e.Progress;
}
private void Uploader_UploadProgressChange(object sender, UploadEventArgs e)
{
progress.Text = "Uploading " + Math.Round(e.Progress) + "% (" + e.Text + ")";
progress.Complete = e.Progress;
}
private void StartUpload_Click(object sender, RoutedEventArgs e)
{
OpenFileDialog dialog = new OpenFileDialog();
dialog.Filter = "Image files (*.gif;*.jpg;*.png)|*.gif;*.jpg;*.png";
dialog.Multiselect = true;
if (dialog.ShowDialog() == true)
{
_uploader.UploadFiles(dialog.Files, "documents/", true);
}
}
}
}
In the example above we are handling the button Click event to display the local file browse dialog. When the user selects a file(s) we pass the selected file list property to the File Upload component which does the rest of the work for you.
The method Uploader_UploadProgressChange is called each time a portion of a file has been uploaded, the portion sizes are specified in the File Upload component using the PacketSize property (the default is 32768 or 32KB).
Receiving the File on the Server
The File Upload component uses a web service to push the data over to the server and your receiving web server must have a web service in order to receive the data. Below is an example of typical web service that could handle this:
using System;
using System.Collections;
using System.IO;
using System.Web;
using System.Web.Services;
using System.Web.Services.Protocols;
// <summary>
// Summary description for FileUploadService
//summary>
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
public class FileUploadService : System.Web.Services.WebService
{
public FileUploadService()
{
//Uncomment the following line if using designed components
//InitializeComponent();
}
[WebMethod]
public string Upload(string mode, string path, string name, string filedata, bool overwrite)
{
string filename = string.Empty;
try
{
filename = Server.MapPath("~") + @"\" + path.Replace("/", @"\") + name;
if (mode == "new")
{
if (File.Exists(filename) == true)
{
if (overwrite)
{
File.Delete(filename);
}
else
{
return "File Already Exists";
}
}
WriteFile(filename, Convert.FromBase64String(filedata), FileMode.Create);
}
else
{
WriteFile(filename, Convert.FromBase64String(filedata), FileMode.Append);
}
}
catch (Exception ex)
{
File.Delete(filename);
return "File Write Error: " + ex.Message;
}
return "ok";
}
private void WriteFile(string filename, byte[] content, FileMode fileMode)
{
Stream target = null;
BinaryWriter writer = null;
try
{
target = File.Open(filename, fileMode);
writer = new BinaryWriter(target);
writer.Write(content);
}
catch (Exception ex)
{
throw new Exception("Could not write to file: " + filename + " - " + ex.Message);
}
finally
{
if (target != null)
{
target.Close();
}
if (writer != null)
{
writer.Close();
}
}
}
}
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