在C#中实现图片缩放(含asp.net用鼠标滚轮实现图片缩放)

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本文介绍如何在ASP.NET中实现图片的缩放功能，包括按指定尺寸缩小图片及利用鼠标滚轮实现图片动态缩放。同时提供代码示例演示如何通过参数设定初始大小并进行比例缩放。

//************************************************************// //下面给出三个简单的方法，后面两个方法是扩展，估计有时用得着 //************************************************************// /// <summary> /// 缩小图片 /// </summary> /// <param name="strOldPic">源图文件名(包括路径)</param> /// <param name="strNewPic">缩小后保存为文件名(包括路径)</param> /// <param name="intWidth">缩小至宽度</param> /// <param name="intHeight">缩小至高度</param> public void SmallPic(string strOldPic, string strNewPic, int intWidth, int intHeight) { System.Drawing.Bitmap objPic,objNewPic; try { objPic = new System.Drawing.Bitmap(strOldPic); objNewPic=new System.Drawing.Bitmap(objPic,intWidth,intHeight); objNewPic.Save(strNewPic); } catch(Exception exp){throw exp;} finally { objPic=null; objNewPic=null; } } /// <summary> /// 按比例缩小图片，自动计算高度 /// </summary> /// <param name="strOldPic">源图文件名(包括路径)</param> /// <param name="strNewPic">缩小后保存为文件名(包括路径)</param> /// <param name="intWidth">缩小至宽度</param> public void SmallPic(string strOldPic, string strNewPic, int intWidth) { System.Drawing.Bitmap objPic,objNewPic; try { objPic = new System.Drawing.Bitmap(strOldPic); int intHeight=(intWidth / objPic.Width) * objPic.Height; objNewPic=new System.Drawing.Bitmap(objPic,intWidth,intHeight); objNewPic.Save(strNewPic); } catch(Exception exp){throw exp;} finally { objPic=null; objNewPic=null; } } /// <summary> /// 按比例缩小图片，自动计算宽度 /// </summary> /// <param name="strOldPic">源图文件名(包括路径)</param> /// <param name="strNewPic">缩小后保存为文件名(包括路径)</param> /// <param name="intHeight">缩小至高度</param> public void SmallPic(string strOldPic, string strNewPic, int intHeight) { System.Drawing.Bitmap objPic,objNewPic; try { objPic = new System.Drawing.Bitmap(strOldPic); int intWidth=(intHeight / objPic.Height) * objPic.Width; objNewPic=new System.Drawing.Bitmap(objPic,intWidth,intHeight); objNewPic.Save(strNewPic); } catch(Exception exp){throw exp;} finally { objPic=null; objNewPic=null; } }

asp.net用鼠标滚轮实现图片缩放

<mce:script language="javascript"></mce:script> <img src='../FloorPicture/<%#DataBinder.EvalContainer.DataItem,"picture")%>' onload="javascript: if(this.width>screen.width*0.7) this.style.width=screen.width*0.7;" onmousewheel="return bbimg(this)">

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312"> <title>用滚轮实现图片缩放</title> </head> <mce:script language="JavaScript"></mce:script> <body> <br>  <img src="图片路径" mce_src="图片路径" onmousewheel="zoomimg(this)"> </body> </html>

asp.net：图片按比例缩放,可输入参数设定初始大小

<mce:scriptlanguage="javascript">  </mce:script>

具体实现代码如下:
<imgsrc="http://www.chenjiliang.com/Article/ArticleImage/100/2176/SideFilter9.jpg"onload="javascript.:resizeimg(this,100,200)">