VsTeXProject.VisualStudio.Project.ImageHandler.GetIconHandle C# (CSharp) Method

        public IntPtr GetIconHandle(int iconIndex)
        {
            // Verify that the object is in a consistent state.
            if (null == imageList)
            {
                throw new InvalidOperationException();
            }
            // Make sure that the list of handles is initialized.
            if (null == iconHandles)
            {
                InitHandlesList();
            }

            // Verify that the index is inside the expected range.
            if ((iconIndex < 0) || (iconIndex >= iconHandles.Count))
            {
                throw new ArgumentOutOfRangeException("iconIndex");
            }

            // Check if the icon is in the cache.
            if (IntPtr.Zero == iconHandles[iconIndex])
            {
                var bitmap = imageList.Images[iconIndex] as Bitmap;
                // If the image is not a bitmap, then we can not build the icon,
                // so we have to return a null handle.
                if (null == bitmap)
                {
                    return IntPtr.Zero;
                }

                iconHandles[iconIndex] = bitmap.GetHicon();
            }

            return iconHandles[iconIndex];
        }