我需要解决以下问题：在Silverlight应用中，用户需要能够将图像上传到客户端（而不是服务器）。图像应显示在wrappanel中。
我是Silverlight的新手，所以你可能会在代码中发现几个错误。下面我发布了代码，希望能够回答这个问题！
的App.xaml：
<Application xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:Dojo_3_wi10b012.ViewModel"
x:Class="Dojo_3_wi10b012.App"
>
<Application.Resources>
<local:ViewModel x:Key="viewModel"/>
</Application.Resources>
</Application>
MainPage.xaml中：
<UserControl x:Class="Dojo_3_wi10b012.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:sdk="http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk"
xmlns:navigation="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Navigation"
xmlns:local="clr-namespace:Dojo_3_wi10b012.ViewModel"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="400">
<Grid x:Name="LayoutRoot" Background="White" DataContext="{StaticResource viewModel}">
<sdk:Frame Height="350" Width="450"
Name="frameContainer" Margin="0,0,0,0">
</sdk:Frame>
<Button Content="Add Image" Command="{Binding Path=AddImageCommand}" Height="23" HorizontalAlignment="Left" Margin="468,454,0,0" Name="buttonAddImage" VerticalAlignment="Top" Width="75" />
</Grid>
</UserControl>
Gallery.xaml：
<navigation:Page x:Class="Dojo_3_wi10b012.View.Gallery"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:navigation="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Navigation"
xmlns:sys="clr-namespace:System;assembly=mscorlib"
xmlns:local="clr-namespace:Dojo_3_wi10b012.ViewModel"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
d:DesignWidth="640" d:DesignHeight="480"
Title="Gallery Page"
NavigationCacheMode="Required" xmlns:toolkit="http://schemas.microsoft.com/winfx/2006/xaml/presentation/toolkit">
<!-- trying to implement Mr. Eckkrammer's hint (wiki)-->
<UserControl.Resources>
<DataTemplate x:Key="galleryTemplate">
<Image>
<Image.Source>
<BitmapImage UriSource="{Binding Image}"/>
</Image.Source>
</Image>
</DataTemplate>
</UserControl.Resources>
<!-- END OF trying to implement Mr. Eckkrammer's hint (wiki)-->
<Grid x:Name="LayoutRoot" Height="350" Width="450" Background="Beige" DataContext="{StaticResource viewModel}">
<!-- "First attempt
<ItemsControl ItemsSource="{Binding ElementName=ImageDescrList, Path=Image ,Mode=TwoWay}" >
<ScrollViewer Width="449" Height="349" Margin="1,1,0,0">
<toolkit:WrapPanel Orientation="Horizontal" ItemWidth="90" ItemHeight="90" Width="Auto" />
</ScrollViewer>
</ItemsControl>
-->
<!-- 2nd attempt (Mr. Eckkrammer's hint (wiki): -->
<ItemsControl ItemsSource="{Binding ElementName=ImageDescrList}" ItemTemplate="{StaticResource galleryTemplate}">
<ScrollViewer Width="449" Height="349" Margin="1,1,0,0">
<toolkit:WrapPanel Orientation="Horizontal" ItemWidth="90" ItemHeight="90" Width="Auto" />
</ScrollViewer>
</ItemsControl>
</Grid>
</navigation:Page>
ImageDescription.cs：
namespace Dojo_3_wi10b012.Model
{
public class ImageDescription : INotifyPropertyChanged
{
private string _description;
private BitmapImage _image;
public string Description
{
get { return _description; }
set
{
_description = value;
NotifyPropertyChanged("Description");
}
}
public BitmapImage Image
{
get { return _image; }
set
{
_image = value;
NotifyPropertyChanged("Image");
}
}
public event PropertyChangedEventHandler PropertyChanged;
public void NotifyPropertyChanged(string propName)
{
if (PropertyChanged != null)
PropertyChanged(this, new PropertyChangedEventArgs(propName));
}
}
}
ViewModel.cs：
using System;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.IO;
using System.IO.IsolatedStorage;
using System.Windows.Media.Imaging;
using System.Collections;
using System.Collections.ObjectModel;
using Dojo_3_wi10b012.Model;
using System.ComponentModel;
namespace Dojo_3_wi10b012.ViewModel
{
public class ViewModel : INotifyPropertyChanged
{
public RelayCommand AddImageCommand { get; private set; }
private ObservableCollection<ImageDescription> _imageDescrList = new ObservableCollection<ImageDescription>();
#region properties
public ObservableCollection<ImageDescription> ImageDescrList
{
get { return _imageDescrList; }
set
{
_imageDescrList = value;
NotifyPropertyChanged("ImageDescrList");
}
}
#endregion
#region Constructor
public ViewModel()
{
AddImageCommand = new RelayCommand(AddImage);
AddImageCommand.IsEnabled = true;
}
#endregion
#region private methods
private void AddImage()
{
//initial ideas: (copy paste + modified from source: http://msdn.microsoft.com/en-us/library/cc221415(v=vs.95).aspx )
// Create an instance of the open file dialog box.
OpenFileDialog openFileDialog1 = new OpenFileDialog();
// Set filter options and filter index.
openFileDialog1.Filter = "JPEG Files (.jpg)|*.jpg|PNG Files (.png)|*.png|GIF Files (.gif)|*.gif|BMP Files (.bmp)|*.bmp|TIFF Files (.tiff)|*.tiff";
openFileDialog1.FilterIndex = 1;
openFileDialog1.Multiselect = false;
// Call the ShowDialog method to show the dialog box.
bool? userClickedOK = openFileDialog1.ShowDialog();
// Process input if the user clicked OK.
if (userClickedOK == true)
{
// Open the selected file to read.
using (var filestream = openFileDialog1.File.OpenRead())
{
var buffer = new byte[filestream.Length];
filestream.Read(buffer, 0, buffer.Length);
//add the image to our list of images
MemoryStream ms = new MemoryStream(buffer, 0, buffer.Length);
BitmapImage temp = new BitmapImage();
temp.SetSource(ms);
ImageDescrList.Add(
new ImageDescription()
{
// Description = filestream.Name,
Description="Default Description",
Image = temp
}
);
ms.Close();
filestream.Close();
}
}
}
#endregion
#region event Handler (property changed)
public event PropertyChangedEventHandler PropertyChanged;
protected void NotifyPropertyChanged(string propertyName)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
#endregion
}
}
答案 0 :(得分：0)
在galleryTemplate模板中尝试将图像源绑定到位图：
<DataTemplate x:Key="galleryTemplate">
<Image Source="{Binding Image}"/>
</DataTemplate>
您似乎正在尝试将位图UriSource绑定到位图（这可能是Uri）：
<DataTemplate x:Key="galleryTemplate">
<Image>
<Image.Source>
<BitmapImage UriSource="{Binding Image}"/>
</Image.Source>
</Image>
</DataTemplate>