Cairo.NativeMethods.cairo_pattern_destroy C# (CSharp) Метод

        internal static extern void cairo_pattern_destroy(IntPtr pattern);

 public void Destroy()
 {
     if (pattern != IntPtr.Zero)
     {
         NativeMethods.cairo_pattern_destroy(pattern);
         pattern = IntPtr.Zero;
     }
     lock (patterns){
         patterns.Remove(this);
     }
 }