Mega Code Archive
A XAML browser application (XBAP) running in partial trust can safely upload files from a client machine
<![CDATA[
<Page x:Class="SafeFileUploadPartialTrustSample.HomePage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="HomePage"
xmlns:dialogs="clr-namespace:Microsoft.Win32;assembly=PresentationFramework">
<StackPanel>
<Button Name="uploadButton" Click="uploadButton_Click" Width="100">Upload Image...</Button>
<Image Name="viewImage" Width="500" Height="300"></Image>
<Label Name="nameLabel"></Label>
</StackPanel>
</Page>
//File:Window.xaml.cs
using System;
using System.IO;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using Microsoft.Win32;
namespace SafeFileUploadPartialTrustSample {
public partial class HomePage : Page, IProvideCustomContentState {
public HomePage() {
InitializeComponent();
}
void uploadButton_Click(object sender, RoutedEventArgs e) {
OpenFileDialog dlg = new OpenFileDialog();
dlg.Filter = "Image Files(*.BMP;*.JPG;*.GIF)|*.BMP;*.JPG;*.GIF|All files (*.*)|*.*";
if (dlg.ShowDialog() == true) {
if (this.viewImage.Source != null) {
ImageCustomContentState iccs = new ImageCustomContentState(this.viewImage.Source, (string)this.nameLabel.Content);
this.NavigationService.AddBackEntry(iccs);
}
using (Stream stream = dlg.OpenFile()) {
BitmapDecoder bitmapDecoder = BitmapDecoder.Create(stream, BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.OnLoad);
this.viewImage.Source = bitmapDecoder.Frames[0];
this.nameLabel.Content = dlg.SafeFileName;
}
}
}
public CustomContentState GetContentState() {
return new ImageCustomContentState(this.viewImage.Source, (string)this.nameLabel.Content);
}
}
[Serializable]
public class ImageCustomContentState : CustomContentState
{
ImageSource imageSource;
string filename;
public ImageCustomContentState(ImageSource imageSource, string filename)
{
this.imageSource = imageSource;
this.filename = filename;
}
public override string JournalEntryName
{
get { return this.filename; }
}
public override void Replay(NavigationService navigationService, NavigationMode mode)
{
HomePage homePage = (HomePage)navigationService.Content;
homePage.viewImage.Source = this.imageSource;
homePage.nameLabel.Content = this.filename;
}
}
}
]]>