Using Reflection.Emit to emit a "using (x) { ... }" block?
- by Lasse V. Karlsen
I'm trying to use Reflection.Emit in C# to emit a using (x) { ... } block.
At the point I am in code, I need to take the current top of the stack, which is an object that implements IDisposable, store this away in a local variable, implement a using block on that variable, and then inside it add some more code (I can deal with that last part.)
Here's a sample C# piece of code I tried to compile and look at in Reflector:
public void Test()
{
TestDisposable disposable = new TestDisposable();
using (disposable)
{
throw new Exception("Test");
}
}
This looks like this in Reflector:
.method public hidebysig instance void Test() cil managed
{
.maxstack 2
.locals init (
[0] class LVK.Reflection.Tests.UsingConstructTests/TestDisposable disposable,
[1] class LVK.Reflection.Tests.UsingConstructTests/TestDisposable CS$3$0000,
[2] bool CS$4$0001)
L_0000: nop
L_0001: newobj instance void LVK.Reflection.Tests.UsingConstructTests/TestDisposable::.ctor()
L_0006: stloc.0
L_0007: ldloc.0
L_0008: stloc.1
L_0009: nop
L_000a: ldstr "Test"
L_000f: newobj instance void [mscorlib]System.Exception::.ctor(string)
L_0014: throw
L_0015: ldloc.1
L_0016: ldnull
L_0017: ceq
L_0019: stloc.2
L_001a: ldloc.2
L_001b: brtrue.s L_0024
L_001d: ldloc.1
L_001e: callvirt instance void [mscorlib]System.IDisposable::Dispose()
L_0023: nop
L_0024: endfinally
.try L_0009 to L_0015 finally handler L_0015 to L_0025
}
I have no idea how to deal with that ".try ..." part at the end there when using Reflection.Emit.
Can someone point me in the right direction?
