int i = 0;
foreach (DataRow row in ds.Tables[0].Rows)
{

context.Response.ContentType = "image/jpeg";
context.Response.ClearContent();
string dcm_path = row["REFERENCE_FILE"].ToString();
string share_ip = SYS_APP_CONFIG.GetAppConfigValue("dcm_share_ip");
zipedFile = row["PATIENT_ID"].ToString();
string tuname = row["PATIENT_NAME"].ToString();
img = DicomUtility.GetJpegFromDcm(dcm_path, System.Drawing.Imaging.ImageFormat.Jpeg);//这是获取一个jpeg格式的图片
Image imgg = BytToImg(img);
zipname = tupian_url + tuname+i.ToString();
url = "d:\\webtupian" + "/" + tupian_url + "/" + zipedFile;
if (!Directory.Exists(url))
{
Directory.CreateDirectory("d:\\webtupian" + "/" + tupian_url + "/" + zipedFile);//创建新路径
}
string name = tuname + i.ToString();

imgg.Save("d:\\webtupian" + "/" + tupian_url + "/" + zipedFile + "/" + name + ".jpeg");//把图片存到 这个路径
listimage.Add("d:\\webtupian" + "/" + tupian_url + "/" + zipedFile + "/" + name + ".jpeg");//把图片路径添加到这个数组
i++;

}

using (Ionic.Zip.ZipFile zip = new Ionic.Zip.ZipFile(zipname, Encoding.Default))
{
foreach (string fileToZip in listimage)
{
using (FileStream fs = new FileStream(fileToZip, FileMode.Open, FileAccess.ReadWrite))
{
byte[] buffer = new byte[fs.Length];
fs.Read(buffer, 0, buffer.Length);
string fileName = fileToZip.Substring(fileToZip.LastIndexOf("\\") + 1);
zip.AddEntry(fileName, buffer);
}
}
zip.Save(context.Response.OutputStream);
}
context.Response.End();
return "1";

执行完之后没有任何反应。下载不成功。上面都正常，就添加到zip下载的时候就没任何反应了。执行完毕之后，下载不行，然后到处也都找不到这个zip文件。