public static void DefaultContextFallback()
{
var assemblyNameStr = "System.Runtime.Loader.Noop.Assembly.dll";
var lcDefault = AssemblyLoadContext.Default;
// Load the assembly in custom load context
FallbackLoadContext flc = new FallbackLoadContext();
var asmTargetAsm = flc.LoadFromAssemblyPath(Path.Combine(s_loadFromPath, assemblyNameStr));
var loadedContext = AssemblyLoadContext.GetLoadContext(asmTargetAsm);
// LoadContext of the assembly should be the custom context and not DefaultContext
Assert.NotEqual(lcDefault, flc);
Assert.Equal(flc, loadedContext);
// Get reference to the helper method that will load assemblies (actually, resolve them)
// from DefaultContext
Type type = asmTargetAsm.GetType("System.Runtime.Loader.Tests.TestClass");
var method = System.Reflection.TypeExtensions.GetMethod(type, "LoadFromDefaultContext");
// Load System.Runtime - since this is on TPA, it should get resolved from DefaultContext
// since FallbackLoadContext does not override the Load method to specify its location.
var assemblyName = "System.Runtime, Version=4.0.0.0";
Assembly asmLoaded = (Assembly)method.Invoke(null, new object[] { assemblyName });
loadedContext = AssemblyLoadContext.GetLoadContext(asmLoaded);
// Confirm assembly Loaded from DefaultContext
Assert.Equal(lcDefault, loadedContext);
Assert.NotEqual(flc, loadedContext);
// Now, do the same from an assembly that we explicitly had loaded in DefaultContext
// in the caller of this method. We should get it from FallbackLoadContext since we
// explicitly loaded it there as well.
assemblyName = "System.Runtime.Loader.Noop.Assembly";
Assembly asmLoaded2 = (Assembly)method.Invoke(null, new object[] { assemblyName });
loadedContext = AssemblyLoadContext.GetLoadContext(asmLoaded2);
Assert.NotEqual(lcDefault, loadedContext);
Assert.Equal(flc, loadedContext);
// Attempt to bind an assembly that has not been loaded in DefaultContext and is not
// present on TPA as well. Such an assembly will not trigger a load since we only consult
// the DefaultContext cache (including assemblies on TPA list) in an attempt to bind.
assemblyName = "System.Runtime.Loader.Noop.Assembly.NonExistent";
Exception ex = null;
try
{
method.Invoke(null, new object[] { assemblyName });
}
catch (TargetInvocationException tie)
{
ex = tie.InnerException;
}
Assert.Equal(typeof(FileNotFoundException), ex.GetType());
}
public static void DefaultContextFallback()
{
var assemblyNameStr = "System.Runtime.Loader.Noop.Assembly.dll";
var lcDefault = AssemblyLoadContext.Default;
// Load the assembly in custom load context
FallbackLoadContext flc = new FallbackLoadContext();
var asmTargetAsm = flc.LoadFromAssemblyPath(Path.Combine(s_loadFromPath, assemblyNameStr));
var loadedContext = AssemblyLoadContext.GetLoadContext(asmTargetAsm);
// LoadContext of the assembly should be the custom context and not DefaultContext
Assert.NotEqual(lcDefault, flc);
Assert.Equal(flc, loadedContext);
// Get reference to the helper method that will load assemblies (actually, resolve them)
// from DefaultContext
Type type = asmTargetAsm.GetType("System.Runtime.Loader.Tests.TestClass");
var method = System.Reflection.TypeExtensions.GetMethod(type, "LoadFromDefaultContext");
// Load System.Runtime - since this is on TPA, it should get resolved from DefaultContext
// since FallbackLoadContext does not override the Load method to specify its location.
var assemblyName = "System.Runtime, Version=4.0.0.0";
Assembly asmLoaded = (Assembly)method.Invoke(null, new object[] {assemblyName});
loadedContext = AssemblyLoadContext.GetLoadContext(asmLoaded);
// Confirm assembly Loaded from DefaultContext
Assert.Equal(lcDefault, loadedContext);
Assert.NotEqual(flc, loadedContext);
// Now, do the same from an assembly that we explicitly had loaded in DefaultContext
// in the caller of this method. We should get it from FallbackLoadContext since we
// explicitly loaded it there as well.
assemblyName = "System.Runtime.Loader.Noop.Assembly";
Assembly asmLoaded2 = (Assembly)method.Invoke(null, new object[] {assemblyName});
loadedContext = AssemblyLoadContext.GetLoadContext(asmLoaded2);
Assert.NotEqual(lcDefault, loadedContext);
Assert.Equal(flc, loadedContext);
// Attempt to bind an assembly that has not been loaded in DefaultContext and is not
// present on TPA as well. Such an assembly will not trigger a load since we only consult
// the DefaultContext cache (including assemblies on TPA list) in an attempt to bind.
assemblyName = "System.Runtime.Loader.Noop.Assembly.NonExistent";
Exception ex = null;
try
{
method.Invoke(null, new object[] {assemblyName});
}
catch(TargetInvocationException tie)
{
ex = tie.InnerException;
}
Assert.Equal(typeof(FileNotFoundException), ex.GetType());
}