LibraryImport Generator sample

_before.cs

[LibraryImport(Libraries.UxTheme)]
public static partial HRESULT DrawThemeEdge(
    IntPtr hTheme,
    Gdi32.HDC hdc,
    int iPartId,
    int iStateId,
    ref RECT pDestRect,
    User32.EDGE uEdge,
    User32.BF uFlags,
    ref RECT pContentRect);

after.cs

internal static unsafe partial class Interop
{
    public static unsafe partial class UxTheme
    {
        [System.CodeDom.Compiler.GeneratedCodeAttribute("Microsoft.Interop.LibraryImportGenerator", "7.0.6.40809")]
        [System.Runtime.CompilerServices.SkipLocalsInitAttribute]
        public static partial global::Interop.HRESULT DrawThemeEdge(nint hTheme, global::Interop.Gdi32.HDC hdc, int iPartId, int iStateId, ref global::Interop.RECT pDestRect, global::Interop.User32.EDGE uEdge, global::Interop.User32.BF uFlags, ref global::Interop.RECT pContentRect)
        {
            global::Interop.HRESULT __retVal;
            // Pin - Pin data in preparation for calling the P/Invoke.
            fixed (global::Interop.RECT* __pDestRect_native = &pDestRect)
            fixed (global::Interop.RECT* __pContentRect_native = &pContentRect)
            {
                __retVal = __PInvoke(hTheme, hdc, iPartId, iStateId, __pDestRect_native, uEdge, uFlags, __pContentRect_native);
            }

            return __retVal;
            // Local P/Invoke
            [System.Runtime.InteropServices.DllImportAttribute("uxtheme.dll", EntryPoint = "DrawThemeEdge", ExactSpelling = true)]
            static extern unsafe global::Interop.HRESULT __PInvoke(nint hTheme, global::Interop.Gdi32.HDC hdc, int iPartId, int iStateId, global::Interop.RECT* pDestRect, global::Interop.User32.EDGE uEdge, global::Interop.User32.BF uFlags, global::Interop.RECT* pContentRect);
        }
    }
}