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Mono.Cecil - How can I found out PInvoke DLL name?

Mono.Cecil provides a way to check whether a method is pinvoke or not with method.IsPInvokeImpl, and also provides more info with method.PInvokeInfo. How can I find out dll name ?

Solution

  • The IL for P/Invoke methods looks like this (for example, kernel32!LockFile):

    .method assembly hidebysig static pinvokeimpl("kernel32.dll" lasterr winapi) 
    bool LockFile (
        class Microsoft.Win32.SafeHandles.SafeFileHandle handle,
        int32 offsetLow,
        int32 offsetHigh,
        int32 countLow,
        int32 countHigh
    ) cil managed preservesig 
{
}

    Mono.Cecil mirrors the pinvokeimpl metadata in the PInvokeInfo class, with the first string packaged up as a ModuleReference. Hence, method.PInvokeInfo.Module.Name gives the DLL/dylib name.