[mono-cecil] How to add a method call to existing code?

[Timwi]

Hi,

I tried something like this:

    var firstInstruction = constr.Body.Instructions[0];
    var cil = constr.Body.CilWorker;
    cil.InsertBefore(firstInstruction, cil.Create(OpCodes.Ldstr, "C:\
\temp\\logfile.log"));
    cil.InsertBefore(firstInstruction, cil.Create(OpCodes.Ldstr, "([<\r
\n{0} constructor\r\n{1}\r\n"));
    cil.InsertBefore(firstInstruction, cil.Create(OpCodes.Ldstr,
"{0}::.ctor({1})".Fmt(type.FullName,
constr.Parameters.Cast<ParameterDefinition>().Select(pd =>
pd.ParameterType.FullName).JoinString(", "))));
    cil.InsertBefore(firstInstruction, cil.Create(OpCodes.Call,
systemEnvironmentGetStackTrace));
    cil.InsertBefore(firstInstruction, cil.Create(OpCodes.Call,
systemStringFormat));
    cil.InsertBefore(firstInstruction, cil.Create(OpCodes.Call,
systemIOFileAppendAllText));

The variables "systemEnvironmentGetStackTrace" etc. contain a
MethodDefinition that I extracted from mscorlib.dll.

Unfortunately, if I save the assembly with the above modifications, I
get a "Bad method token" error when running it.

How can I fix this so that the inserted IL instructions reference the
correct method in mscorlib?

Thanks
Timwi

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mono-cecil