ashx文件的使用[转]
原文:http://www.cnblogs.com/jerry0925/articles/901936.html
Ashx文件,我们可用用来作图片加载(在之前我们一般使用ASPX或者Webservice去做),一般做法如下:
Handler.ashx:
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<%@ WebHandler Language="C#" Class="Handler" %>
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using System;
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using System.IO;
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using System.Web;
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public class Handler : IHttpHandler {
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public bool IsReusable {
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get {
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return true;
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}
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}
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public void ProcessRequest (HttpContext context) {
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context.Response.ContentType = "image/jpeg";
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context.Response.Cache.SetCacheability(HttpCacheability.Public);
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context.Response.BufferOutput = false;
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PhotoSize size;
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switch (context.Request.QueryString["Size"]) {
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case "S":
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size = PhotoSize.Small;
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break;
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case "M":
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size = PhotoSize.Medium;
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break;
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case "L":
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size = PhotoSize.Large;
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break;
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default:
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size = PhotoSize.Original;
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break;
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}
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Int32 id = -1;
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Stream stream = null;
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if (context.Request.QueryString["PhotoID"] != null && context.Request.QueryString["PhotoID"] != "") {
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id = Convert.ToInt32(context.Request.QueryString["PhotoID"]);
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stream = PhotoManager.GetPhoto(id, size);
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} else {
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id = Convert.ToInt32(context.Request.QueryString["AlbumID"]);
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stream = PhotoManager.GetFirstPhoto(id, size);
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}
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if (stream == null) stream = PhotoManager.GetPhoto(size);
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const int buffersize = 1024 * 16;
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byte[] buffer = new byte[buffersize];
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int count = stream.Read(buffer, 0, buffersize);
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while (count > 0) {
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context.Response.OutputStream.Write(buffer, 0, count);
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count = stream.Read(buffer, 0, buffersize);
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}
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}
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}
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*.aspx:
<img src="myHttpHander.ashx?id=123" width="20" height="20" />
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:
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<%@ WebHandler Language="C#" Class="Handler" %>
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using System;
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using System.Web;
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public class Handler : IHttpHandler {
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public void ProcessRequest (HttpContext context) {
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context.Response.ContentType = "text/plain";
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context.Response.Write("alert('hi')");
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}
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public bool IsReusable {
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get {
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return false;
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}
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}
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}
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*.aspx:
弹出alert
<script src="Handler.ashx"></script>
也可以把.ashx当成css文件
<link href="css/Handler.ashx" rel="stylesheet" type="text/css">
xml文件
orderDoc.load("Handler.ashx");
还可以嵌入文字:
Handler.ashx:
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<%@ WebHandler Language="C#" Class="TestHandler" %>
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using System;
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using System.Web;
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public class TestHandler : IHttpHandler {
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public void ProcessRequest (HttpContext context) {
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context.Response.ContentType = "text/plain";
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context.Response.Write("document.write(\"Hello World\");");
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}
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public bool IsReusable {
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get {
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return false;
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}
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}
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}
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*.aspx:
<script type="text/javascript" src="TestHandler.ashx" />
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