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http://www.cnblogs.com/ListenFly/archive/2013/03/13/2953096.html

<Image Source="1.jpg" />
<Image  Source="pack://application:,,,/1.jpg"/>

<Image Source="/smmc;component/Images/undo_16.png"  ></Image>
<Image Source="Images/1.jpg"></Image>
<Image Source="/Images/2.jpg" Grid.Row="1"></Image>


Uri uri = new Uri("/siteoforiginfile.xaml", UriKind.Relative);
StreamResourceInfo info = Application.GetRemoteStream(uri);
System.Windows.Markup.XamlReader reader = new System.Windows.Markup.XamlReader();
Page page = (Page)reader.LoadAsync(info.Stream);
this.siteoforiginfileframe.Content = page;

void click0(object sender, RoutedEventArgs e) {
Uri uri = new Uri("/VersionedReferencedAssembly;v1.0.0.0;component/ResourceFile.xaml", UriKind.RelativeOrAbsolute);
this.frame.Source = uri;
}

void click1(object sender, RoutedEventArgs e)
{
Uri uri = new Uri("/VersionedReferencedAssembly;v1.0.0.1;component/ResourceFile.xaml", UriKind.RelativeOrAbsolute);
this.frame.Source = uri;
}




=========================================================================
 
<Application.Resources>
    <ResourceDictionary>
        <ResourceDictionary.MergedDictionaries>
            <ResourceDictionary Source="Styles/DefaultStyle.xaml"/>
        </ResourceDictionary.MergedDictionaries>
    </ResourceDictionary>
</Application.Resources>

============================================================
<ResourceDictionary 
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
 
    <ResourceDictionary.MergedDictionaries>
        <ResourceDictionary Source="DefaultStyle/Button.xaml"/>
    </ResourceDictionary.MergedDictionaries>
 
    <Style TargetType="{x:Type Rectangle}" />
 
</ResourceDictionary>


======================================================================


<ResourceDictionary.MergedDictionaries>
   <SharedResourceDictionary Source="/MyControlLibrary;component/Themes/Brushes.xaml"  />
</ResourceDictionary.MergedDictionaries>
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++



public class SharedResourceDictionary : ResourceDictionary
{
    /// <summary>
    /// Internal cache of loaded dictionaries 
    /// </summary>
    public static Dictionary<Uri, ResourceDictionary> _sharedDictionaries =
        new Dictionary<Uri, ResourceDictionary>();
 
    /// <summary>
    /// Local member of the source uri
    /// </summary>
    private Uri _sourceUri;
 
    /// <summary>
    /// Gets or sets the uniform resource identifier (URI) to load resources from.
    /// </summary>
    public new Uri Source
    {
        get { return _sourceUri; }
        set
        {
            _sourceUri = value;
 
            if (!_sharedDictionaries.ContainsKey(value))
            {
                // If the dictionary is not yet loaded, load it by setting
                // the source of the base class
                base.Source = value;
 
                // add it to the cache
                _sharedDictionaries.Add(value, this);
            }
            else
            {
                // If the dictionary is already loaded, get it from the cache
                MergedDictionaries.Add(_sharedDictionaries[value]);
            }
        }
    }
}