问必须声明主体，因为它未标记为抽象或外部(CS0501)

EN

namespace Gtk
{
    [ToolboxItem(true)]
    public class GLWidget : DrawingArea, IDisposable
    {
        IGraphicsContext graphicsContext;
        static int graphicsContextCount;

        /// <summary>Use a single buffer versus a double buffer.</summary>
        [Browsable(true)]
        public bool SingleBuffer { get; set; }

        /// <summary>Color Buffer Bits-Per-Pixel</summary>
        public int ColorBPP { get; set; }

        /// <summary>Accumulation Buffer Bits-Per-Pixel</summary>
        public int AccumulatorBPP { get; set; }

        /// <summary>Depth Buffer Bits-Per-Pixel</summary>
        public int DepthBPP { get; set; }

        /// <summary>Stencil Buffer Bits-Per-Pixel</summary>
        public int StencilBPP { get; set; }

        /// <summary>Number of samples</summary>
        public int Samples { get; set; }

        /// <summary>Indicates if steropic renderering is enabled</summary>
        public bool Stereo { get; set; }

        IWindowInfo windowInfo;