C#生成缩略图源码代码,CSharp代码库,德仔网

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【CSharp】 C#生成缩略图源码
作者:Dezai.CN / 发布于2012/10/25/ 670
<div>//<span style="color: rgb(57, 57, 57); font-family: verdana, 'ms song', Arial, Helvetica, sans-serif; font-size: 14px; line-height: 21px; background-color: rgb(250, 247, 239);">先看调用的方法</span></div>
<div>
<div>using System;</div>
<div>using System.Data;</div>
<div>using System.Configuration;</div>
<div>using System.Collections;</div>
<div>using System.Web;</div>
<div>using System.Web.Security;</div>
<div>using System.Web.UI;</div>
<div>using System.Web.UI.WebControls;</div>
<div>using System.Web.UI.WebControls.WebParts;</div>
<div>using System.Web.UI.HtmlControls;</div>
<div></div>
<div>public partial class test_Default : System.Web.UI.Page</div>
<div>{</div>
<div>  protected void Page_Load(object sender, EventArgs e)</div>
<div>  {</div>
<div>    generalImage();</div>
<div>  }
<div>  private void generalImage()</div>
<div>  {</div>
<div>    string savePath = @"images/123.jpg";//原图路径</div>
<div>    string smallPath = @"images/small/123.jpg";//要生成的小图</div>
<div>    savePath = Server.MapPath(savePath);//这一步别忘了。</div>
<div>    smallPath = Server.MapPath(smallPath);//同样这里也不要忘了。</div>
<div>    YD.Common.ImageClass imageClass = new YD.Common.ImageClass();</div>
<div>    imageClass.ShowThumbnail(savePath, smallPath, 200, 153);//这样调用</div>
<div>  }
<div>}
<div><span style="color: rgb(57, 57, 57); font-family: verdana, 'ms song', Arial, Helvetica, sans-serif; font-size: 14px; line-height: 21px; background-color: rgb(250, 247, 239);">生成小图的类：</span></div>
<div>
<div>using System;</div>
<div>using System.Data;</div>
<div>using System.Configuration;</div>
<div>using System.Web;</div>
<div>using System.Web.Security;</div>
<div>using System.Web.UI;</div>
<div>using System.Web.UI.WebControls;</div>
<div>using System.Web.UI.WebControls.WebParts;</div>
<div>using System.Web.UI.HtmlControls;</div>
<div>using System.Drawing;</div>
<div>using System.Drawing.Imaging;</div>
<div>using System.IO;</div>
<div>/// <summary></div>
<div>/// ImageClass 的摘要说明</div>
<div>/// </summary></div>
<div>namespace YD.Common</div>
<div>{</div>
<div>  public class ImageClass</div>
<div>  {</div>
<div>    public bool ThumbnailCallback()</div>
<div>    {</div>
<div>      return false;</div>
<div>    }
<div>    public void ShowThumbnail(string oldfile, string newfile, int white, int height)</div>
<div>    {</div>
<div>      System.Drawing.Image image = System.Drawing.Image.FromFile(oldfile);</div>
<div>      //获取原图高度和宽度</div>
<div>      int oldh = image.Height;</div>
<div>      int oldw = image.Width;</div>
<div>      int neww, newh;</div>
<div>      neww = white; newh = height;  //直接设定新图的高宽,,</div>
<div></div>
<div>      try</div>
<div>      {</div>
<div>        System.Drawing.Image.GetThumbnailImageAbort callb = new System.Drawing.Image.GetThumbnailImageAbort(ThumbnailCallback);</div>
<div>        System.Drawing.Image bt = new System.Drawing.Bitmap(neww, newh);</div>
<div>        System.Drawing.Graphics gr = System.Drawing.Graphics.FromImage(bt);</div>
<div>        gr.Clear(Color.White);</div>
<div>        gr.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;</div>
<div>        gr.DrawImage(image, new Rectangle(0, 0, neww, newh), 0, 0, oldw, oldh, GraphicsUnit.Pixel);</div>
<div>        switch (oldfile.Substring(oldfile.Length - 3).ToUpper())</div>
<div>        {</div>
<div>          case "JPG":</div>
<div>            bt.Save(newfile, ImageFormat.Jpeg);</div>
<div>            break;</div>
<div>          case "GIF":</div>
<div>            bt.Save(newfile, ImageFormat.Gif);</div>
<div>            break;</div>
<div>          case "PNG":</div>
<div>            bt.Save(newfile, ImageFormat.Png);</div>
<div>            break;</div>
<div>          default:</div>
<div>            bt.Save(newfile, ImageFormat.Jpeg);</div>
<div>            break;</div>
<div>        }
<div>        gr.Dispose();</div>
<div>        bt.Dispose();</div>
<div>        image.Dispose();</div>
<div>      }
<div>      catch { }
<div></div>
<div>    }
<div>  }
<div>}
<div></div>
</div>
</div>
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