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    <p>Here is how to inject a finally.</p> <p>First you need to fix your return statements. You only want one.</p> <pre><code>Instruction FixReturns() { if (Method.ReturnType == TypeSystem.Void) { var instructions = body.Instructions; var lastRet = Instruction.Create(OpCodes.Ret); instructions.Add(lastRet); for (var index = 0; index &lt; instructions.Count - 1; index++) { var instruction = instructions[index]; if (instruction.OpCode == OpCodes.Ret) { instructions[index] = Instruction.Create(OpCodes.Leave, lastRet); } } return lastRet; } else { var instructions = body.Instructions; var returnVariable = new VariableDefinition("methodTimerReturn", Method.ReturnType); body.Variables.Add(returnVariable); var lastLd = Instruction.Create(OpCodes.Ldloc, returnVariable); instructions.Add(lastLd); instructions.Add(Instruction.Create(OpCodes.Ret)); for (var index = 0; index &lt; instructions.Count - 2; index++) { var instruction = instructions[index]; if (instruction.OpCode == OpCodes.Ret) { instructions[index] = Instruction.Create(OpCodes.Leave, lastLd); instructions.Insert(index, Instruction.Create(OpCodes.Stloc, returnVariable)); index++; } } return lastLd; } } </code></pre> <p>Then find the first instruction. You will need to skip 2 if it is an instance constructor.</p> <pre><code>Instruction FirstInstructionSkipCtor() { if (Method.IsConstructor &amp;&amp; !Method.IsStatic) { return body.Instructions.Skip(2).First(); } return body.Instructions.First(); } </code></pre> <p>Then stitch it together</p> <pre><code>void InnerProcess() { body = Method.Body; body.SimplifyMacros(); ilProcessor = body.GetILProcessor(); var returnInstruction = FixReturns(); var firstInstruction = FirstInstructionSkipCtor(); var beforeReturn = Instruction.Create(OpCodes.Nop); ilProcessor.InsertBefore(returnInstruction, beforeReturn); InjectIlForFinaly(returnInstruction); var handler = new ExceptionHandler(ExceptionHandlerType.Finally) { TryStart = firstInstruction, TryEnd = beforeReturn, HandlerStart = beforeReturn, HandlerEnd = returnInstruction, }; body.ExceptionHandlers.Add(handler); body.InitLocals = true; body.OptimizeMacros(); } </code></pre>
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    1. COSo it's basically the same process as described in that post, just passing ExceptionHandlerType.Finally into new ExceptionHandler(). And if you want a try/catch/finally, you're creating two "ExceptionHandler" instances and adding them to the method, one for the catch, one for the finally. If that's the case, the names are certainly confusing since you're not really creating new exception handlers, at least for 'finally'. Thanks for the pointers.
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