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以下是引用片段:
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private void btnUploadPicture_Click(object sender, System.EventArgs e)
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{
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//检查上传文件的格式是否有效
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if(this.UploadFile.PostedFile.ContentType.ToLower().IndexOf("image") < 0)
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{
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Response.Write("上传图片格式无效!");
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return;
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}
10![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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//生成原图
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Byte[] oFileByte = new byte[this.UploadFile.PostedFile.ContentLength];
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System.IO.Stream oStream = this.UploadFile.PostedFile.InputStream;
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System.Drawing.Image oImage = System.Drawing.Image.FromStream(oStream);
15![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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int oWidth = oImage.Width; //原图宽度
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int oHeight = oImage.Height; //原图高度
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int tWidth = 100; //设置缩略图初始宽度
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int tHeight = 100; //设置缩略图初始高度
20![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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//按比例计算出缩略图的宽度和高度
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if(oWidth >= oHeight)
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{
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tHeight = (int)Math.Floor(Convert.ToDouble(oHeight) * (Convert.ToDouble(tWidth) / Convert.ToDouble(oWidth)));
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}
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else
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{
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tWidth = (int)Math.Floor(Convert.ToDouble(oWidth) * (Convert.ToDouble(tHeight) / Convert.ToDouble(oHeight)));
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}
30![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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//生成缩略原图
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Bitmap tImage = new Bitmap(tWidth,tHeight);
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Graphics g = Graphics.FromImage(tImage);
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g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; //设置高质量插值法
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g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;//设置高质量,低速度呈现平滑程度
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g.Clear(Color.Transparent); //清空画布并以透明背景色填充
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g.DrawImage(oImage,new Rectangle(0,0,tWidth,tHeight),new Rectangle(0,0,oWidth,oHeight),GraphicsUnit.Pixel);
38![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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string oFullName = Server.MapPath(".") + "/" + "o" + DateTime.Now.ToShortDateString().Replace("-","") + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + DateTime.Now.Millisecond.ToString() + ".jpg"; //保存原图的物理路径
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string tFullName = Server.MapPath(".") + "/" + "t" + DateTime.Now.ToShortDateString().Replace("-","") + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + DateTime.Now.Millisecond.ToString() + ".jpg"; //保存缩略图的物理路径
41![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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try
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{
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//以JPG格式保存图片
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oImage.Save(oFullName,System.Drawing.Imaging.ImageFormat.Jpeg);
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tImage.Save(tFullName,System.Drawing.Imaging.ImageFormat.Jpeg);
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}
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catch(Exception ex)
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{
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throw ex;
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}
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finally
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{
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//释放资源
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oImage.Dispose();
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g.Dispose();
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tImage.Dispose();
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}
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}
60![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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