mono/tests/assemblyresolve_event5.cs

   1 using System;
   2 using System.Reflection;
   3 using System.Reflection.Emit;
   4
   5
   6 public class TestAssemblyResolveEvent {
   7         public static int Main (String[] args) {
   8                 // Regression test for https://bugzilla.xamarin.com/show_bug.cgi?id=57851
   9
  10                 // If the custom attributes of an assembly trigger a
  11                 // ResolveEventHandler, and that handler returns an
  12                 // AssemblyBuilder, don't crash.
  13                 var h = new MockResolver ("assemblyresolve_event5_label");
  14                 var aName = new AssemblyName ("assemblyresolve_event5_helper");
  15                 var a = AppDomain.CurrentDomain.Load (aName);
  16                 var t = a.GetType ("MyClass");
  17                 h.StartHandling ();
  18                 var cas = t.GetCustomAttributes (true);
  19                 h.StopHandling ();
  20                 return 0;
  21         }
  22 }
  23
  24
  25 public class MockResolver {
  26         private Assembly mock;
  27         private ResolveEventHandler d;
  28         private string theName;
  29
  30         public MockResolver (string theName) {
  31                 mock = CreateMock (theName);
  32                 d = new ResolveEventHandler (HandleResolveEvent);
  33                 this.theName = theName;
  34         }
  35
  36         public void StartHandling () {
  37                 AppDomain.CurrentDomain.AssemblyResolve += d;
  38         }
  39
  40         public void StopHandling () {
  41                 AppDomain.CurrentDomain.AssemblyResolve -= d;
  42         }
  43
  44         public Assembly HandleResolveEvent (Object sender, ResolveEventArgs args) {
  45                 Console.Error.WriteLine ("handling load of {0}", args.Name);
  46                 if (args.Name.StartsWith (theName))
  47                         return mock;
  48                 else
  49                         return null;
  50         }
  51
  52         private static Assembly CreateMock (string s) {
  53                 var an = new AssemblyName (s);
  54                 var ab = AssemblyBuilder.DefineDynamicAssembly (an, AssemblyBuilderAccess.Run);
  55                 var mb = ab.DefineDynamicModule (an.Name);
  56
  57                 var tb = mb.DefineType ("Foo", TypeAttributes.Public);
  58                 tb.DefineDefaultConstructor (MethodAttributes.Public);
  59                 tb.CreateType ();
  60
  61                 return ab;
  62         }
  63 }