解决反射加载Xap包中的图片路径问题

图片路径问题

　　最近做的silverlight项目框架设计是将每个模块都做成单独的silverlight项目，这些单独项目生成的Xap包通过在父silverlight程序中

反射实现加载。在实际开发过程中，用blend添加的图片默认路径是"\123.jpg”。编译后图片会做为内容一起打包到Xap中。在图片路径中

以"\"开始的路径，silverlight运行时会从父silverlight Xap包中搜索文件，然后显示。而反射加载的xap包中的图片会找不到路径。

解决方法

　　解决此问题比较简单，我们需要将反射xap包中的图片设置为资源，然后将图片路径"\123.jpg”修改为"123.jpg”。

　　在图片路径中如果没有"\"，silverlight运行时将会从资源中搜索图片。

xap包反射加载类

　　

代码

public class XapLoader
{
public static UserControl LoadStream(Stream e, string MainPage, string MainDll)
{
string appMainfest = new StreamReader(Application.GetResourceStream(
new StreamResourceInfo(e, null)
, new Uri("AppManifest.xaml", UriKind.Relative)).Stream
).ReadToEnd();

XElement xe = (XDocument.Parse(appMainfest)).Root;

var results = from deploymentPart in xe.Elements().Elements()
where deploymentPart.Attributes("Source").Count() > 0
select deploymentPart.Attribute("Source").Value;

Assembly asse = null;

foreach (var deploymentpart in results)
{
string source = deploymentpart;

StreamResourceInfo streamInfo = Application.GetResourceStream(new StreamResourceInfo(e, "application/binary"),
new Uri(source, UriKind.Relative));

AssemblyPart assP = new AssemblyPart();

if (source == MainDll)
{
asse = assP.Load(streamInfo.Stream);
}
else
{
assP.Load(streamInfo.Stream);
}
}

return asse.CreateInstance(MainPage) as UserControl;
}

public void loadUri(Uri xapuri, string MainPage, string MainDll)
{
WebClient wc = new WebClient();
wc.OpenReadCompleted += new OpenReadCompletedEventHandler((s, e) => {
string appMainfest = new StreamReader(Application.GetResourceStream(
new StreamResourceInfo(e.Result, null)
, new Uri("AppManifest.xaml", UriKind.Relative)).Stream
).ReadToEnd();

XElement xe = (XDocument.Parse(appMainfest)).Root;

var results = from deploymentPart in xe.Elements().Elements()
where deploymentPart.Attributes("Source").Count() > 0
select deploymentPart.Attribute("Source").Value;

Assembly asse = null;

foreach (var deploymentpart in results)
{
string source = deploymentpart;

StreamResourceInfo streamInfo = Application.GetResourceStream(new StreamResourceInfo(e.Result, "application/binary"),
new Uri(source, UriKind.Relative));

AssemblyPart assP = new AssemblyPart();

if (source == MainDll)
{
asse = assP.Load(streamInfo.Stream);
}
else
{
assP.Load(streamInfo.Stream);
}
}

UIElement uie = asse.CreateInstance(MainPage) as UIElement;

if (OnLoadComplete != null)
OnLoadComplete(this, new XapEventArgs() { XapRootUIElement = uie });
});
wc.OpenReadAsync(xapuri);
}

public event EventHandler<XapEventArgs> OnLoadComplete;
}

public class XapEventArgs : EventArgs
{
public UIElement XapRootUIElement { get; set; }
}