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這篇文章主要講解了“ashx文件的使用方法有哪些”,文中的講解內(nèi)容簡(jiǎn)單清晰,易于學(xué)習(xí)與理解,下面請(qǐng)大家跟著小編的思路慢慢深入,一起來研究和學(xué)習(xí)“ashx文件的使用方法有哪些”吧!
一提到Ashx文件,我們就會(huì)想到http handler以及圖片加載(在之前我們一般使用ASPX或者Webservice去做),一般做法如下:
Handler.ashx:
復(fù)制代碼 代碼如下:
<%@ 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:
<img src="myHttpHander.ashx?id=123" width="20" height="20" />
我們變通以下,發(fā)現(xiàn)其實(shí)除了可以輸出圖片以外,還可以輸出文字:
Handler.ashx:
復(fù)制代碼 代碼如下:
<%@ 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:
彈出alert
<script src="Handler.ashx"></script>
也可以把.ashx當(dāng)成css文件
<link href="css/Handler.ashx" rel="stylesheet" type="text/css">
xml文件
orderDoc.load("Handler.ashx");
還可以嵌入文字:
Handler.ashx:
復(fù)制代碼 代碼如下:
<%@ 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:
<script type="text/javascript" src="TestHandler.ashx" />
當(dāng)你希望從ashx或HttpHandler里訪問你的Session時(shí),你必須實(shí)現(xiàn)IReadOnlySessionState接口.
代碼:
復(fù)制代碼 代碼如下:
using System;
using System.Web;
using System.Web.SessionState;
public class DownloadHandler : IHttpHandler, IReadOnlySessionState
{
public bool IsReusable { get { return true; } }
public void ProcessRequest(HttpContext ctx)
{
ctx.Response.Write(ctx.Session["fred"]);
}
}
感謝各位的閱讀,以上就是“ashx文件的使用方法有哪些”的內(nèi)容了,經(jīng)過本文的學(xué)習(xí)后,相信大家對(duì)ashx文件的使用方法有哪些這一問題有了更深刻的體會(huì),具體使用情況還需要大家實(shí)踐驗(yàn)證。這里是億速云,小編將為大家推送更多相關(guān)知識(shí)點(diǎn)的文章,歡迎關(guān)注!
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