/// <summary>
/// Emit the required IL instructions to the new method.
/// </summary>
private DynamicMethod BuildTestMethod(Type fixtureType, string methodName, MethodBodyReader reader)
{
Type exceptionType = typeof(Exception);
Type exceptionCollectionType = typeof(Dictionary <int, Exception>);
ConstructorInfo exceptionCollectionTypeConstructor = exceptionCollectionType.GetConstructor(Type.EmptyTypes);
MethodInfo exceptionCollectionTypeAddMethod = exceptionCollectionType.GetMethod("Add");
List <List <ILInstruction> > sections = GetMethodSections(reader);
ushort freeLocalIndex = reader.GetFreeLocalIndex();
ushort localExceptionCollection = freeLocalIndex++;
ushort localException = freeLocalIndex++;
DynamicMethod testMethod = new DynamicMethod(methodName, exceptionCollectionType,
new Type[] { fixtureType }, fixtureType);
ILGenerator generator = testMethod.GetILGenerator();
DeclareLocalVariableTypes(generator, reader);
// Instantiate exception collection.
generator.DeclareLocal(exceptionCollectionType);
generator.Emit(OpCodes.Nop);
generator.Emit(OpCodes.Newobj, exceptionCollectionTypeConstructor);
generator.Emit(OpCodes.Stloc_S, localExceptionCollection);
foreach (List <ILInstruction> sect in sections)
{
// Start the try block.
generator.BeginExceptionBlock();
foreach (ILInstruction instruction in sect)
{
instruction.EmitTo(generator);
}
// If no exception was thrown add a null reference to the collection.
generator.Emit(OpCodes.Ldloc_S, localExceptionCollection);
generator.Emit(OpCodes.Ldc_I4, sect[0].Offset);
generator.Emit(OpCodes.Ldnull);
generator.Emit(OpCodes.Callvirt, exceptionCollectionTypeAddMethod);
generator.Emit(OpCodes.Nop);
// Catch Exception.
generator.BeginCatchBlock(exceptionType);
// Save thrown exception.
generator.DeclareLocal(exceptionType);
generator.Emit(OpCodes.Stloc_S, localException);
generator.Emit(OpCodes.Nop);
// Add the exception to the collection.
generator.Emit(OpCodes.Ldloc_S, localExceptionCollection);
generator.Emit(OpCodes.Ldc_I4, sect[0].Offset);
generator.Emit(OpCodes.Ldloc_S, localException);
generator.Emit(OpCodes.Callvirt, exceptionCollectionTypeAddMethod);
generator.Emit(OpCodes.Nop);
// Exit the try block.
generator.EndExceptionBlock();
}
generator.Emit(OpCodes.Ldloc_S, localExceptionCollection);
generator.Emit(OpCodes.Ret);
return(testMethod);
}