/// <summary>
/// An event handler for resolving Silverlight framework assembly versioning.
/// </summary>
/// <remarks>
/// When a previous version of a Silverlight assembly is sought, the targeted version
/// of that Silverlight assembly will be returned.
/// </remarks>
/// <param name="sender">The event sender.</param>
/// <param name="args">The assembly resolution event arguments.</param>
/// <returns>The <see cref="Assembly"/> from the targeted version of Silverlight, or <c>null</c>.</returns>
private static Assembly ResolveFrameworkAssemblyVersioning(object sender, ResolveEventArgs args)
{
FrameworkManifest frameworkManifest = (FrameworkManifest)AppDomain.CurrentDomain.GetData(AppDomainUtilities.FrameworkManifestKey);
System.Diagnostics.Debug.Assert(frameworkManifest != null, "The FrameworkManifest must have been set on the AppDomain");
AssemblyName requestedAssembly = new AssemblyName(args.Name);
// If the requested assembly is a System assembly and it's an older version
// than the framework manifest has, then we'll need to resolve to its newer version
bool isOldVersion = requestedAssembly.Version.CompareTo(frameworkManifest.SystemVersion) < 0;
if (isOldVersion && requestedAssembly.IsSystemAssembly())
{
// Now we need to see if the requested assembly is part of the framework manifest (as opposed to an SDK assembly)
FrameworkManifestEntry silverlightAssembly;
// If the assembly is part of the framework manifest, then we need to "redirect" its resolution
// to the current framework version.
if (frameworkManifest.Assemblies.TryGetValue(requestedAssembly.Name, out silverlightAssembly))
{
// Find the Silverlight framework assembly from the already-loaded assemblies
var matches = from assembly in AppDomain.CurrentDomain.ReflectionOnlyGetAssemblies()
let assemblyName = assembly.GetName()
where assemblyName.Name == silverlightAssembly.Name &&
assemblyName.GetPublicKeyToken().SequenceEqual(silverlightAssembly.PublicKeyTokenBytes) &&
assemblyName.Version.CompareTo(silverlightAssembly.Version) == 0
select assembly;
return(matches.SingleOrDefault());
}
}
return(null);
}
/// <summary>
/// Creates an <see cref="AppDomain"/> configured for client code generation.
/// </summary>
/// <param name="options">The code generation options.</param>
internal static void ConfigureAppDomain(ClientCodeGenerationOptions options)
{
FrameworkManifest frameworkManifest = GetFrameworkManifest(options.ClientFrameworkPath);
AppDomain.CurrentDomain.ReflectionOnlyAssemblyResolve += AppDomainUtilities.ResolveFrameworkAssemblyVersioning;
AppDomain.CurrentDomain.SetData(FrameworkManifestKey, frameworkManifest);
}
/// <summary>
/// Gets the list of Silverlight assemblies found in the manifest within the specified
/// Silverlight framework directory.
/// </summary>
/// <param name="silverlightFrameworkDirectory">The directory containing the Silverlight framework manifest.</param>
/// <returns>The list of assemblies that are part of the Silverlight runtime.</returns>
private static FrameworkManifest GetSilverlightFrameworkManifest(string silverlightFrameworkDirectory)
{
FrameworkManifest manifest = new FrameworkManifest();
List <FrameworkManifestEntry> assemblies = new List <FrameworkManifestEntry>();
XPathDocument manifestDocument = new XPathDocument(silverlightFrameworkDirectory + SilverlightManifestFilename);
XPathNavigator navigator = manifestDocument.CreateNavigator();
XPathNodeIterator iterator = navigator.Select("/manifest/*[name and publickeytoken and version]");
while (iterator.MoveNext())
{
// guaranteed to have name, publickeytoken and version by the XPath query
iterator.Current.MoveToChild("name", string.Empty);
string name = iterator.Current.Value;
iterator.Current.MoveToParent();
iterator.Current.MoveToChild("publickeytoken", string.Empty);
string publickeytoken = iterator.Current.Value;
iterator.Current.MoveToParent();
iterator.Current.MoveToChild("version", string.Empty);
string version = iterator.Current.Value;
iterator.Current.MoveToParent();
// The public key token that was read as a hex string; convert it to a byte array
// Every 2 characters represent a single byte in hex.
byte[] publicKeyTokenBytes =
Enumerable.Range(0, publickeytoken.Length)
.Where(x => 0 == x % 2)
.Select(x => Convert.ToByte(publickeytoken.Substring(x, 2), 16))
.ToArray();
FrameworkManifestEntry assembly = new FrameworkManifestEntry();
assembly.Name = name;
assembly.Version = new Version(version);
assembly.PublicKeyTokenBytes = publicKeyTokenBytes;
assemblies.Add(assembly);
}
manifest.Assemblies = assemblies.ToArray();
return(manifest);
}
/// <summary>
/// Gets the list of Silverlight assemblies found in the manifest within the specified
/// Silverlight framework directory.
/// </summary>
/// <param name="silverlightFrameworkDirectory">The directory containing the Silverlight framework manifest.</param>
/// <returns>The list of assemblies that are part of the Silverlight runtime.</returns>
private static FrameworkManifest GetSilverlightFrameworkManifest(string silverlightFrameworkDirectory)
{
FrameworkManifest manifest = new FrameworkManifest();
List<FrameworkManifestEntry> assemblies = new List<FrameworkManifestEntry>();
XPathDocument manifestDocument = new XPathDocument(silverlightFrameworkDirectory + SilverlightManifestFilename);
XPathNavigator navigator = manifestDocument.CreateNavigator();
XPathNodeIterator iterator = navigator.Select("/manifest/*[name and publickeytoken and version]");
while (iterator.MoveNext())
{
// guaranteed to have name, publickeytoken and version by the XPath query
iterator.Current.MoveToChild("name", string.Empty);
string name = iterator.Current.Value;
iterator.Current.MoveToParent();
iterator.Current.MoveToChild("publickeytoken", string.Empty);
string publickeytoken = iterator.Current.Value;
iterator.Current.MoveToParent();
iterator.Current.MoveToChild("version", string.Empty);
string version = iterator.Current.Value;
iterator.Current.MoveToParent();
// The public key token that was read as a hex string; convert it to a byte array
// Every 2 characters represent a single byte in hex.
byte[] publicKeyTokenBytes =
Enumerable.Range(0, publickeytoken.Length)
.Where(x => 0 == x % 2)
.Select(x => Convert.ToByte(publickeytoken.Substring(x, 2), 16))
.ToArray();
FrameworkManifestEntry assembly = new FrameworkManifestEntry();
assembly.Name = name;
assembly.Version = new Version(version);
assembly.PublicKeyTokenBytes = publicKeyTokenBytes;
assemblies.Add(assembly);
}
manifest.Assemblies = assemblies.ToArray();
return manifest;
}
