Check whether executable is managed

So, another interesting question: "How to check whether the executable file managed or not by code". Answering - ask framework about it version.

        [DllImport("mscoree.dll")]

        private static extern int GetFileVersion(

                        [MarshalAs(UnmanagedType.LPWStr)] string szFilename,

                        [MarshalAs(UnmanagedType.LPWStr)] StringBuilder szBuffer,

                        int cchBuffer,

                        out int dwLength);

But any, even very unmanaged file has file version - you ask. Any managed file has managed signature, so if the file is not managed, the method return COR_E_ASSEMBLYEXPECTED, else it return main core framework version.

 

        private string GetRuntimeVersion(string filename)

        {

            const int CCH = 0x400;

            StringBuilder sb = new StringBuilder(CCH);

            int len;

            int hr = GetFileVersion(filename, sb, sb.Capacity, out len);

            if (hr == unchecked((int)0x8007000B))

                return string.Empty; 

            else if (hr < 0)

                throw new Win32Exception(hr);

            else

                return sb.ToString(0, len - 1);

        }

Pretty simple, isn't is?

Source code for this article