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ashx文件的使用小结_实用技巧_

2023-05-24 353人已围观

简介 ashx文件的使用小结_实用技巧_

一提到Ashx文件，我们就会想到http handler以及图片加载（在之前我们一般使用ASPX或者Webservice去做），一般做法如下：

Handler.ashx：

<%@ WebHandler Language="C#" Class="Handler" %>
using System;
using System.IO;
using System.Web;
public class Handler : IHttpHandler {

public bool IsReusable {
get {
   return true;
}
}
public void ProcessRequest (HttpContext context) {
context.Response.ContentType = "image/jpeg";
context.Response.Cache.SetCacheability(HttpCacheability.Public);
context.Response.BufferOutput = false;
PhotoSize size;
switch (context.Request.QueryString["Size"]) {
   case "S":
    size = PhotoSize.Small;
    break;
   case "M":
    size = PhotoSize.Medium;
    break;
   case "L":
    size = PhotoSize.Large;
    break;
   default:
    size = PhotoSize.Original;
    break;
}
Int32 id = -1;
Stream stream = null;
if (context.Request.QueryString["PhotoID"] != null && context.Request.QueryString["PhotoID"] != "") {
   id = Convert.ToInt32(context.Request.QueryString["PhotoID"]);
   stream = PhotoManager.GetPhoto(id, size);
} else {
   id = Convert.ToInt32(context.Request.QueryString["AlbumID"]);
   stream = PhotoManager.GetFirstPhoto(id, size);
}
if (stream == null) stream = PhotoManager.GetPhoto(size);
const int buffersize = 1024 * 16;
byte[] buffer = new byte[buffersize];
int count = stream.Read(buffer, 0, buffersize);
while (count > 0) {
   context.Response.OutputStream.Write(buffer, 0, count);
   count = stream.Read(buffer, 0, buffersize);
}
}
}

*.aspx:

我们变通以下，发现其实除了可以输出图片以外，还可以输出文字：
Handler.ashx：

复制代码代码如下:

<%@ WebHandler Language="C#" Class="Handler" %>
using System;
using System.Web;
public class Handler : IHttpHandler {

    public void ProcessRequest (HttpContext context) {
        context.Response.ContentType = "text/plain";
        context.Response.Write("alert('hi')");
    }

    public bool IsReusable {
        get {
            return false;
        }
    }
}

*.aspx:
弹出alert

也可以把.ashx当成css文件

xml文件
orderDoc.load("Handler.ashx");

还可以嵌入文字：
Handler.ashx：

复制代码代码如下:

<%@ WebHandler Language="C#" Class="TestHandler" %>
using System;
using System.Web;
public class TestHandler : IHttpHandler {

    public void ProcessRequest (HttpContext context) {
        context.Response.ContentType = "text/plain";
        context.Response.Write("document.write(\"Hello World\");");
    }

    public bool IsReusable {
        get {
            return false;
        }
    }
}

*.aspx: