ImageViewer Class

[ToolboxBitmapAttribute(typeof(PictureBox))]
public class ImageViewer : BaseControl

<ToolboxBitmapAttribute(GetType(PictureBox))>
Public Class ImageViewer
	Inherits BaseControl

[ToolboxBitmapAttribute(typeof(PictureBox))]
public ref class ImageViewer : public BaseControl

[<ToolboxBitmapAttribute(typeof(PictureBox))>]
type ImageViewer = 
    class
        inherit BaseControl
    end

Inheritance

Object    MarshalByRefObject    Component    Control    BaseControl    ImageViewer

The ImageViewer control supports both Bitmap and Metafile instances, supporting every PixelFormat, including the ones that are not supported by the PictureBox control or the GDI+ renderer. It supports Wine and Mono runtimes as well.

The control can use optimizations for very fast rendering even if the image is zoomed. It can use multiple CPU cores to generate the displayed image. The generation happens asynchronously, so the control may display a low-quality preview image while the high-quality one is being generated. Very huge images may consume much memory, but if too high memory pressure is detected, the optimizations are automatically turned off.

The SmoothingEnabled property allows turning on and off interpolation when zooming. It can be used also for Metafile images, in which case the metafile is rendered with antialiasing. As a contrast, the PictureBox control always uses interpolation when displaying a resized Bitmap, and never uses antialiasing when displaying a Metafile image.

The Zoom property allows you to set an arbitrary zoom. The zoom can also be adjusted by the mouse (Ctrl+Mouse wheel). When the displayed image is larger than the control, the scrollbars are automatically shown. Pan the image by dragging it with the mouse or by using the arrow keys. You can also use the AutoZoom property to to automatically adjust the zoom to fit the image to the control.

The following image illustrates a few features of the ImageViewer class, like panning and zooming by the mouse, and setting SmoothingEnabled, AutoZoom and Zoom properties explicitly:

Reference