C#ÒýÓÃFillRect

[System.Runtime.InteropServices.DllImportAttribute("gdi32.dll")]
private static extern long FillRect(IntPtr hDc, Rectangle lpRect, long hBrush);

FillRect(dc, rc, brush);

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[System.Runtime.InteropServices.DllImportAttribute("USER32.DLL")]
private static extern long FillRect(IntPtr hDc, RECT lpRect, IntPtr hBrush);