.net又一个生成缩略图的方法

生成缩略图是一个十分常用功能，找到了一个方法，重写部分代码，实用又好用，.net又一个生成缩略图的方法，不变形

/// <summary>

/// 为图片生成缩略图 by 何问起

/// </summary>

/// <param name="phyPath">原图片的路径</param>

/// <param name="width">缩略图宽</param>

/// <param name="height">缩略图高</param>

/// <returns></returns>

public System.Drawing.Image GetHvtThumbnail(System.Drawing.Image image, int width, int height)

{

//代码是从开源项目HoverTreeCMS中获取的

//更多信息请参考：http://hovertree.com/menu/hovertreecms/

Bitmap m_hovertreeBmp = new Bitmap(width, height);

//从Bitmap创建一个System.Drawing.Graphics

Graphics m_HvtGr = Graphics.FromImage(m_hovertreeBmp);

//设置

m_HvtGr.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;

//下面这个也设成高质量

m_HvtGr.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;

//下面这个设成High

m_HvtGr.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;

//把原始图像绘制成上面所设置宽高的缩小图

Rectangle rectDestination = new Rectangle(0, 0, width, height);

int m_width, m_height;

if (image.Width * height > image.Height * width)

{

m_height = image.Height;

m_width = (image.Height * width) / height;

}

else

{

m_width = image.Width;

m_height = (image.Width * height) / width;

}

m_HvtGr.DrawImage(image, rectDestination, 0, 0, m_width, m_height, GraphicsUnit.Pixel);

return m_hovertreeBmp;

}