private static Assembly AssemblyResolve_ManagedProfilerDependencies(object sender, ResolveEventArgs args)
{
var assemblyName = new AssemblyName(args.Name);
// On .NET Framework, having a non-US locale can cause mscorlib
// to enter the AssemblyResolve event when searching for resources
// in its satellite assemblies. This seems to have been fixed in
// .NET Core in the 2.0 servicing branch, so we should not see this
// occur, but guard against it anyways. If we do see it, exit early
// so we don't cause infinite recursion.
if (string.Equals(assemblyName.Name, "System.Private.CoreLib.resources", StringComparison.OrdinalIgnoreCase) ||
string.Equals(assemblyName.Name, "System.Net.Http", StringComparison.OrdinalIgnoreCase))
{
return(null);
}
var path = Path.Combine(ManagedProfilerDirectory, $"{assemblyName.Name}.dll");
// Only load the main profiler into the default Assembly Load Context.
// If OpenTelemetry.AutoInstrumentation or other libraries are provided by the NuGet package their loads are handled in the following two ways.
// 1) The AssemblyVersion is greater than or equal to the version used by OpenTelemetry.AutoInstrumentation, the assembly
// will load successfully and will not invoke this resolve event.
// 2) The AssemblyVersion is lower than the version used by OpenTelemetry.AutoInstrumentation, the assembly will fail to load
// and invoke this resolve event. It must be loaded in a separate AssemblyLoadContext since the application will only
// load the originally referenced version
if (assemblyName.Name.StartsWith("OpenTelemetry.AutoInstrumentation", StringComparison.OrdinalIgnoreCase) && File.Exists(path))
{
StartupLogger.Debug("Loading {0} with Assembly.LoadFrom", path);
return(Assembly.LoadFrom(path));
}
else if (File.Exists(path))
{
StartupLogger.Debug("Loading {0} with DependencyLoadContext.LoadFromAssemblyPath", path);
return(DependencyLoadContext.LoadFromAssemblyPath(path)); // Load unresolved framework and third-party dependencies into a custom Assembly Load Context
}
return(null);
}
private static Assembly AssemblyResolve_ManagedProfilerDependencies(object sender, ResolveEventArgs args)
{
var assemblyName = new AssemblyName(args.Name).Name;
// On .NET Framework, having a non-US locale can cause mscorlib
// to enter the AssemblyResolve event when searching for resources
// in its satellite assemblies. Exit early so we don't cause
// infinite recursion.
if (string.Equals(assemblyName, "mscorlib.resources", StringComparison.OrdinalIgnoreCase) ||
string.Equals(assemblyName, "System.Net.Http", StringComparison.OrdinalIgnoreCase))
{
return(null);
}
var path = Path.Combine(ManagedProfilerDirectory, $"{assemblyName}.dll");
if (File.Exists(path))
{
StartupLogger.Debug("Loading {0}", path);
return(Assembly.LoadFrom(path));
}
return(null);
}