一提到Ashx文件，我們就會想到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：
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);
}
}
}
我們變通以下，發(fā)現(xiàn)其實除了可以輸出圖片以外，還可以輸出文字：
Handler.ashx：
public bool IsReusable {
get {
return false;
}
}
}
xml文件
orderDoc.load("Handler.ashx");
還可以嵌入文字：
Handler.ashx：
public bool IsReusable {
get {
return false;
}
}
}
當(dāng)你希望從ashx或HttpHandler里訪問你的Session時,你必須實現(xiàn)IReadOnlySessionState接口.
代碼:
public class DownloadHandler : IHttpHandler, IReadOnlySessionState
{
public bool IsReusable { get { return true; } }
public void ProcessRequest(HttpContext ctx)
{
ctx.Response.Write(ctx.Session["fred"]);
}
}
