asp.net 生成缩略图代码 |
时间:2015-01-29 来源:互联网 作者:佚名 |
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复制代码 代码如下: using System; using System.Data; using System.Configuration; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Web.UI.HtmlControls; using System.IO; using System.Drawing; using System.Drawing.Imaging;
/// <summary> /// 图片处理类 /// 1、生成缩略图片或按照比例改变图片的大小和画质 /// 2、将生成的缩略图放到指定的目录下 /// </summary> public class ImageClass { public System.Drawing.Image ResourceImage; private int ImageWidth; private int ImageHeight;
public string ErrMessage;
/// <summary> /// 类的构造函数 /// </summary> /// <param name="ImageFileName">图片文件的全路径名称</param> public ImageClass(string ImageFileName) { ResourceImage = System.Drawing.Image.FromFile(ImageFileName); ErrMessage = ""; }
public bool ThumbnailCallback() { return false; }
/// <summary> /// 生成缩略图重载方法1,返回缩略图的Image对象 /// </summary> /// <param name="Width">缩略图的宽度</param> /// <param name="Height">缩略图的高度</param> /// <returns>缩略图的Image对象</returns> public System.Drawing.Image GetReducedImage(int Width, int Height) { try { System.Drawing.Image ReducedImage;
System.Drawing.Image.GetThumbnailImageAbort callb = new System.Drawing.Image.GetThumbnailImageAbort(ThumbnailCallback);
ReducedImage = ResourceImage.GetThumbnailImage(Width, Height, callb, IntPtr.Zero);
return ReducedImage; } catch (Exception e) { ErrMessage = e.Message; return null; } }
/// <summary> /// 生成缩略图重载方法2,将缩略图文件保存到指定的路径 /// </summary> /// <param name="Width">缩略图的宽度</param> /// <param name="Height">缩略图的高度</param> /// <param name="targetFilePath">缩略图保存的全文件名,(带路径),参数格式:D:Images ilename.jpg</param> /// <returns>成功返回true,否则返回false</returns> public bool GetReducedImage(int Width, int Height, string targetFilePath) { try { System.Drawing.Image ReducedImage;
System.Drawing.Image.GetThumbnailImageAbort callb = new System.Drawing.Image.GetThumbnailImageAbort(ThumbnailCallback);
ReducedImage = ResourceImage.GetThumbnailImage(Width, Height, callb, IntPtr.Zero); ReducedImage.Save(@targetFilePath, ImageFormat.Jpeg);
ReducedImage.Dispose();
return true; } catch (Exception e) { ErrMessage = e.Message; return false; } }
/// <summary> /// 生成缩略图重载方法3,返回缩略图的Image对象 /// </summary> /// <param name="Percent">缩略图的宽度百分比 如:需要百分之80,就填0.8</param> /// <returns>缩略图的Image对象</returns> public System.Drawing.Image GetReducedImage(double Percent) { try { System.Drawing.Image ReducedImage;
System.Drawing.Image.GetThumbnailImageAbort callb = new System.Drawing.Image.GetThumbnailImageAbort(ThumbnailCallback);
ImageWidth = Convert.ToInt32(ResourceImage.Width * Percent); ImageHeight = Convert.ToInt32(ResourceImage.Width * Percent);
ReducedImage = ResourceImage.GetThumbnailImage(ImageWidth, ImageHeight, callb, IntPtr.Zero);
return ReducedImage; } catch (Exception e) { ErrMessage = e.Message; return null; } }
/// <summary> /// 生成缩略图重载方法4,返回缩略图的Image对象 /// </summary> /// <param name="Percent">缩略图的宽度百分比 如:需要百分之80,就填0.8</param> /// <param name="targetFilePath">缩略图保存的全文件名,(带路径),参数格式:D:Images ilename.jpg</param> /// <returns>成功返回true,否则返回false</returns> public bool GetReducedImage(double Percent, string targetFilePath) { try { System.Drawing.Image ReducedImage;
System.Drawing.Image.GetThumbnailImageAbort callb = new System.Drawing.Image.GetThumbnailImageAbort(ThumbnailCallback);
ImageWidth = Convert.ToInt32(ResourceImage.Width * Percent); ImageHeight = Convert.ToInt32(ResourceImage.Width * Percent);
ReducedImage = ResourceImage.GetThumbnailImage(ImageWidth, ImageHeight, callb, IntPtr.Zero);
ReducedImage.Save(@targetFilePath, ImageFormat.Jpeg);
ReducedImage.Dispose();
return true; } catch (Exception e) { ErrMessage = e.Message; return false; } } }
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