请教各位大人,关于铲铲同志GetThumbnail.aspx缩略图显示的一个问题 - 编程论坛

源代码我贴到下面,问题是这样的:
GetThumbnail.aspx我是从网上拷到的,调用的时候提供的参数应该也是没有问题的,但是图片却不能正常输出,很奇怪.
请各位高人指点一下,不胜感激啊!!

以下为GetThumbnail.aspx文件:

程序代码：

<%@ Page Language="C#" AutoEventWireup="false" CodeFile="GetThumbnail.aspx.cs" Inherits="GetThumbnail" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www. xmlns="http://www. >
<head runat="server">
    <title>无标题页</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>

    </div>
    </form>
</body>
</html>

以下为GetThumbnail.aspx.cs文件:

程序代码：

using System;
using System.Data;
using System.Configuration;
using System.Collections;
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.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;

public partial class GetThumbnail : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        // 在此处放置用户代码以初始化页面
        Response.Clear();
        try
        {
            //需显示的图片的物理路径
            string originalFileName = Request["fn"].ToString();
            //需显示的图片的宽度
            int thumbnailWidth = Convert.ToInt32(Request["tw"]);
            //需显示的图片的高度
            int thumbnailHeight = Convert.ToInt32(Request["th"]);

            System.Drawing.Image img = System.Drawing.Image.FromFile(originalFileName);
            System.Drawing.Imaging.ImageFormat thisFormat = img.RawFormat;
            System.Drawing.Size newSize = this.GetNewSize(thumbnailWidth, thumbnailHeight, img.Width, img.Height);
            System.Drawing.Bitmap outBmp = new Bitmap(thumbnailWidth, thumbnailHeight);
            System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(outBmp);

             = System.Drawing. = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
            g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBilinear;
            g.Clear(System.Drawing.Color.White);
            g.DrawImage(img, new Rectangle((thumbnailWidth - newSize.Width) / 2, (thumbnailHeight - newSize.Height) / 2, newSize.Width, newSize.Height), 0, 0, img.Width, img.Height, GraphicsUnit.Pixel);
            g.Dispose();
            img.Dispose();

            if (thisFormat.Equals(System.Drawing.Imaging.ImageFormat.Gif))
                Response.ContentType = "image/gif";
            else
                Response.ContentType = "image/jpeg";

            System.Drawing.Imaging.EncoderParameters encoderParams = new EncoderParameters();
            long[] quality = new long[] { 100 };
            System.Drawing.Imaging.EncoderParameter encoderParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, quality);
            encoderParams.Param[0] = encoderParam;

            System.Drawing.Imaging.ImageCodecInfo[] arrayICI = System.Drawing.Imaging.ImageCodecInfo.GetImageEncoders();
            System.Drawing.Imaging.ImageCodecInfo jpegICI = null;
            for (int fwd = 0; fwd < arrayICI.Length; fwd++)
            {
                if (arrayICI[fwd].FormatDescription.Equals("JPEG"))
                {
                    jpegICI = arrayICI[fwd];
                    break;
                }
            }
            if (jpegICI != null)
            {
                outBmp.Save(Response.OutputStream, jpegICI, encoderParams);
            }
            else
            {
                outBmp.Save(Response.OutputStream, thisFormat);
            }
            outBmp.Dispose();

        }
        catch (Exception err)
        {

        }
    }
    private System.Drawing.Size GetNewSize(int maxWidth, int maxHeight, int width, int height)
    {
        double w = 0.0;
        double h = 0.0;
        double sw = Convert.ToDouble(width);
        double sh = Convert.ToDouble(height);
        double mw = Convert.ToDouble(maxWidth);
        double mh = Convert.ToDouble(maxHeight);
        if (sw < mw && sh < mh)
        {
            w = sw;
            h = sh;
        }
        else if ((sw / sh) > (mw / mh))
        {
            w = maxWidth;
            h = (w * sh) / sw;
        }
        else
        {
            h = maxHeight;
            w = (h * sw) / sh;
        }
        return new System.Drawing.Size(Convert.ToInt32(w), Convert.ToInt32(h));
    }
}

以下为调用该文件的代码:

程序代码：

相关图片如下:

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