调用aspx页面返回的图像随机慢 [英] call aspx page to return an image randomly slow

问题描述

OK，这里是一个问题，我有一个asp.net网站，有一个aspx页面称为GetThumbnail.aspx中，code是象下面这样：

OK, here is the question, I have a asp.net website, there is an aspx page called GetThumbnail.aspx, the code is like below:

string newThumbnailPath = ReaderUtilities.GetThumbnailPath(ptiId, highQuality ? ZoomLevel.L : ZoomLevel.S);
Response.Clear();
if (File.Exists(newThumbnailPath))
{
  Response.ContentType = "image/jpg";
  Response.TransmitFile(newThumbnailPath);
}

这是它。新的 newThumbnailPath 是网络共享路径，平时喜欢D：\\ ImagesCache \\ 000 \\ 0001 \\ 000123 \\ 000123456 \\ 000123456-SML-1.JPG

That is it. the new newThumbnailPath is a network share path, usually like D:\ImagesCache\000\0001\000123\000123456\000123456-sml-1.jpg

然后在我的网站上有一个searchResult.aspx，当用户键入某些关键词进行搜索，我将显示searchresult.aspx页面上，searchResult.aspx里面，我将显示10张图像时，code低于

Then in my website there is a searchResult.aspx, when user type some keyword to search, I will display the searchresult.aspx page, inside the searchResult.aspx, I will display 10 images, the code is below:

<img rel="429746" src="/GetThumbnail.aspx?p=429746" class="cover-img draggable">

OK，问题是，每次，生产服务器上，必须有几个图像加载速度很慢，说8个图像平均1秒内加载，但2图像需要7或9秒加载。所有的图像都小，他们并不需要调整，我用萤火虫网检查，慢加载图像DNS查找，连接和发送都几乎为1ms，和接收是200或300毫秒，但需要等待8或9秒。

OK, the question is, everytime, on production server, there must be several images loading very slow, say 8 images load within averagely 1 second, but 2 images take 7 or 9 seconds to load. All the images are small, and they don't need to resize, I used firebug Net to check, the slow loading images' DNS lookup, Connecting and Sending are all almost 1ms, and Receiving is 200 or 300ms, but the Waiting takes 8 or 9 seconds.

我认为这是因为IO的，但为什么大多数图像的很快，只是一些随机，任何帮助。我真的AP preciate它。

I thought it is because of IO, but why most of images are quick, just some and randomly, any help. I really appreciate it.

推荐答案

由于您使用的.aspx 页（而不是处理器），同时，由于加载到浏览器不是一个接一个，但许多图像一起的我怀疑你觉得在页面会话锁，这就是为什么这种延迟。

Because you use .aspx page (and not handler), and because the images loaded by browser not one by one, but many together, I suspect that you felt on the session lock of the page and that's why this delay.

尝试设置 =的EnableSessionState假在页面上。

例如：

<%@ Page language="c#" Codebehind="WebForm1.aspx.cs" 
    AutoEventWireup="false" Inherits="WebApplication1.WebForm1" 
     EnableSessionState="false" %>

顺便说一句，如果你改变aspx页面给你去获得一些更多的速度，因为处理程序页面并没有让所有的调用，通常一个网页做处理页面。

By the way, if you change the aspx page to a handler page you going to gain some more speed because the handler page did not make all the calls that a normally page do.

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