What are the ways to use ashx files
This article mainly explains the "what is the use of ashx files", the content of the explanation is simple and clear, easy to learn and understand, the following please follow the editor's ideas slowly in depth, together to study and learn "what is the use of ashx files" bar!
When it comes to Ashx files, we think of http handler and image loading (we usually used ASPX or Webservice to do it before). The general practice is as follows:
Handler.ashx:
The copy code is as follows:
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:
We modify the following and find that we can output not only pictures but also text:
Handler.ashx:
The copy code is as follows:
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:
Eject alert
You can also think of .ashx as a css file
Xml file
OrderDoc.load ("Handler.ashx")
You can also embed text:
Handler.ashx:
The copy code is as follows:
Using System
Using System.Web
Public class TestHandler: IHttpHandler {
Public void ProcessRequest (HttpContext context) {
Context.Response.ContentType = "text/plain"
Context.Response.Write ("[xss_clean] (\" Hello World\ ");")
}
Public bool IsReusable {
Get {
Return false
}
}
}
* .aspx:
When you want to access your Session from ashx or HttpHandler, you must implement the IReadOnlySessionState interface.
Code:
The copy code is as follows:
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"])
}
}
Thank you for your reading, the above is the content of "what is the use of ashx files?" after the study of this article, I believe you have a deeper understanding of the use of ashx files, and the specific use needs to be verified in practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!
