Probe into the source--system.drawing of class library

I. A brief description of the System.Drawing namespace

The System.Drawing namespace provides the basic functionality to access GDI +, more advanced features in the system.drawing.drawing2d,system.drawing.imaging and System.Drawing.Text namespaces

Assembly: System.Drawing.dll

Ii. Brief introduction of System.Drawing.Image

Image class: An abstract base class that provides functionality for classes originating from Bitmap and Metafile

Namespaces: System.Drawing

Assembly: System.Drawing.dll

Prototype definition:

[Serializabaleattribute][comvisibleattribute (true)][typeconverterattribute (  typeof(ImageConverter))]publicabstractclass Image:marshalbyrefobject, ISerializable, ICloneable, IDisposable

Common Instance Properties:

Height gets the altitude (in pixels) of the current image instance

Width gets the widths (in pixels) of the current image instance

HorizontalResolution get the horizontal resolution (pixels/inch) of the current image instance

VerticalResolution get the vertical resolution (pixels/inch) of the current image instance

Physicaldimension Gets the width and height of the current image.

Rawformat getting the current image format

PixelFormat gets the pixel format of the current image

Code:

1 usingSystem;2 usingSystem.Drawing;3 4 classApp5 {6     Static voidMain ()7     {8         varimg = Image.FromFile (@"image format. jpg");//image format. png to name extension9 Console.WriteLine (img. Height);Ten Console.WriteLine (img. Width); One Console.WriteLine (img. HorizontalResolution); A Console.WriteLine (img. verticalresolution); - Console.WriteLine (img. physicaldimension); - Console.WriteLine (img. Physicaldimension.width); the Console.WriteLine (img. Physicaldimension.height); - Console.WriteLine (img.        Rawformat);  -Console.WriteLine (IMG. Rawformat.equals (System.Drawing.Imaging.ImageFormat.Png));//whether it is in Png format -Console.WriteLine (IMG. Rawformat.equals (System.Drawing.Imaging.ImageFormat.Jpeg));//whether it is a JPG format, not an extension myoji jpg is not equal to the image format is Jpeg + Console.WriteLine (img. PixelFormat); -     } +}

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Common static methods:

public static image FromFile (string filename) creates an image from the specified file

public static image FromStream (Stream stream) creates an image from the specified data stream

Common example methods:

Public Image getthumbnailimage (int thumbwidth,int Thumbheight,system.drawing.image.getthumbnailimageabort callback, INTPTR callbackdata) Returns the thumbnail of this image

RotateFlip rotation

public void Save (string filename) saves the Image to the specified file or stream

Code:

usingSystem;usingSystem.Drawing;classapp{Static voidMain () {using(varimg = Image.FromFile (@"image format. jpg"))        {                            //generate thumbnail images            varThumbimg = img. Getthumbnailimage ( the, -, () =>{return false;},intptr.zero); Thumbimg.save (@"image Format _thumb.jpg"); //Image Rollover            varNewimg = img. Clone () asImage;            Newimg.rotateflip (ROTATEFLIPTYPE.ROTATE180FLIPX); Newimg.save (@"image Format _x axis flip 180 degrees. jpg"); }    }}

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Probe into the source--system.drawing of class library