对给定的一个图片（Image对象）生成一个指定大小的缩代码,CSharp代码库,德仔网

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【CSharp】对给定的一个图片（Image对象）生成一个指定大小的缩

作者:世民 / 发布于2014/11/3/ 661


	/// <summary>

	/// 对给定的一个图片（Image对象）生成一个指定大小的缩略图。

	/// </summary>

	/// <param name="originalImage">原始图片</param>

	/// <param name="thumMaxWidth">缩略图的宽度</param>

	/// <param name="thumMaxHeight">缩略图的高度</param>

	/// <returns>返回缩略图的Image对象</returns>

	public static System.Drawing.Image GetThumbNailImage(System.Drawing.Image originalImage, int thumMaxWidth, int thumMaxHeight)

	{

	 Size thumRealSize = Size.Empty;

	 System.Drawing.Image newImage = originalImage;

	 Graphics graphics = null;

	 try

	 {

	 thumRealSize = GetNewSize(thumMaxWidth, thumMaxHeight, originalImage.Width, originalImage.Height);

	 newImage = new Bitmap(thumRealSize.Width, thumRealSize.Height);

	 graphics = Graphics.FromImage(newImage);

	 graphics.CompositingQuality = CompositingQuality.HighQuality;

	 graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;

	 graphics.SmoothingMode = SmoothingMode.HighQuality;

	 graphics.Clear(Color.Transparent);

	 graphics.DrawImage(originalImage, new Rectangle(0, 0, thumRealSize.Width, thumRealSize.Height), new Rectangle(0, 0, originalImage.Width, originalImage.Height), GraphicsUnit.Pixel);

	 }

	 catch { }

	 finally

	 {

	 if (graphics != null)

	 {

	 graphics.Dispose();

	 graphics = null;

	 }

	 }

	 return newImage;

	}

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　缩略图　

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