// this code is borrowed from XamlSchemaContext
internal static bool AssemblySatisfiesReference(AssemblyName assemblyName, AssemblyName reference)
{
if (reference.Name != assemblyName.Name)
{
return(false);
}
if (reference.Version != null && !reference.Version.Equals(assemblyName.Version))
{
return(false);
}
if (reference.CultureInfo != null && !reference.CultureInfo.Equals(assemblyName.CultureInfo))
{
return(false);
}
byte[] requiredToken = reference.GetPublicKeyToken();
if (requiredToken != null)
{
byte[] actualToken = assemblyName.GetPublicKeyToken();
if (!AssemblyNameEqualityComparer.IsSameKeyToken(requiredToken, actualToken))
{
return(false);
}
}
return(true);
}
internal static Assembly GetAssembly(AssemblyName assemblyName)
{
// the following assembly resolution logic
// emulates the Xaml's assembly resolution logic as closely as possible.
// Should Xaml's assembly resolution logic ever change, this code needs update as well.
// please see XamlSchemaContext.ResolveAssembly()
if (assemblyCache == null)
{
lock (s_assemblyCacheLock)
{
if (assemblyCache == null)
{
assemblyCache = new Hashtable(AssemblyCacheInitialSize, new AssemblyNameEqualityComparer());
}
}
}
Assembly assembly = assemblyCache[assemblyName] as Assembly;
if (assembly != null)
{
return(assembly);
}
// search current AppDomain first
// this for-loop part is to ensure that
// loose AssemblyNames get resolved in the same way
// as Xaml would do. that is to find the first match
// found starting from the end of the array of Assemblies
// returned by AppDomain.GetAssemblies()
Assembly[] currentAssemblies = AppDomain.CurrentDomain.GetAssemblies();
for (int i = currentAssemblies.Length - 1; i >= 0; i--)
{
Assembly curAsm = currentAssemblies[i];
if (curAsm.IsDynamic)
{
// ignore dynamic assemblies
continue;
}
AssemblyName curAsmName = GetFastAssemblyName(curAsm);
Version curVersion = curAsmName.Version;
CultureInfo curCulture = curAsmName.CultureInfo;
byte[] curKeyToken = curAsmName.GetPublicKeyToken();
Version reqVersion = assemblyName.Version;
CultureInfo reqCulture = assemblyName.CultureInfo;
byte[] reqKeyToken = assemblyName.GetPublicKeyToken();
if ((String.Compare(curAsmName.Name, assemblyName.Name, StringComparison.OrdinalIgnoreCase) == 0) &&
(reqVersion == null || reqVersion.Equals(curVersion)) &&
(reqCulture == null || reqCulture.Equals(curCulture)) &&
(reqKeyToken == null || AssemblyNameEqualityComparer.IsSameKeyToken(reqKeyToken, curKeyToken)))
{
lock (s_assemblyCacheLock)
{
assemblyCache[assemblyName] = curAsm;
return(curAsm);
}
}
}
assembly = LoadAssembly(assemblyName);
if (assembly != null)
{
lock (s_assemblyCacheLock)
{
assemblyCache[assemblyName] = assembly;
}
}
return(assembly);
}