/// <summary>
/// Logic to load an embedded assembly
/// </summary>
/// <param name="assemblyLocationInformation"></param>
/// <returns>Assembly</returns>
private Assembly LoadEmbeddedAssembly(AssemblyLocationInformation assemblyLocationInformation)
{
if (!assemblyLocationInformation.IsEmbedded)
{
return(null);
}
// Check if we can work with temporary files
if (_applicationConfig.CopyEmbeddedAssembliesToFileSystem)
{
var assembly = LoadEmbeddedAssemblyViaTmpFile(assemblyLocationInformation);
if (assembly != null)
{
return(assembly);
}
}
if (Log.IsVerboseEnabled())
{
Log.Verbose().WriteLine("Loading {0} internally, this COULD cause assembly load context issues...", assemblyLocationInformation.Name);
}
using (var stream = Resources.AbsoluteResourceAsStream(assemblyLocationInformation.ContainingAssembly, assemblyLocationInformation.Filename))
{
return(Assembly.Load(stream.ToByteArray()));
}
}
/// <summary>
/// This is a workaround where an embedded assembly is written to a tmp file, which solves some issues
/// </summary>
/// <param name="assemblyLocationInformation">AssemblyLocationInformation</param>
/// <returns>Assembly</returns>
private Assembly LoadEmbeddedAssemblyViaTmpFile(AssemblyLocationInformation assemblyLocationInformation)
{
var assemblyFileName = $@"{FileLocations.AddonsLocation}\{assemblyLocationInformation.Name}.dll";
using (var stream = Resources.AbsoluteResourceAsStream(assemblyLocationInformation.ContainingAssembly, assemblyLocationInformation.Filename))
{
try
{
if (ShouldWrite(assemblyLocationInformation, assemblyFileName))
{
using (var fileStream = new FileStream(assemblyFileName, FileMode.OpenOrCreate, FileAccess.Write, FileShare.None))
{
stream.CopyTo(fileStream);
}
// Register delete on exit, this is done by calling a command
_assembliesToDeleteAtExit.Add(assemblyFileName);
}
// Get the assembly name from the file
var assemblyName = AssemblyName.GetAssemblyName(assemblyFileName);
if (Log.IsVerboseEnabled())
{
Log.Verbose().WriteLine("Loading {0} from {1}", assemblyLocationInformation.Name, assemblyFileName);
}
// Use load, as it's now in the probing path
return(Assembly.Load(assemblyName));
}
catch (Exception)
{
stream.Seek(0, SeekOrigin.Begin);
var appdataDirectory = $@"{Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData)}\{_applicationConfig.ApplicationName}";
assemblyFileName = $@"{appdataDirectory}\{assemblyLocationInformation.Name}.dll";
if (ShouldWrite(assemblyLocationInformation, assemblyFileName))
{
using (var fileStream = new FileStream(assemblyFileName, FileMode.OpenOrCreate, FileAccess.Write, FileShare.None))
{
stream.CopyTo(fileStream);
}
// Register delete on exit, this is done by calling a command
_assembliesToDeleteAtExit.Add(assemblyFileName);
}
if (Log.IsVerboseEnabled())
{
Log.Verbose().WriteLine("Loading {0} from {1}", assemblyLocationInformation.Name, assemblyFileName);
}
// Use load-from, as it's on a different place
return(Assembly.LoadFrom(assemblyFileName));
}
}
}