ashx文件

ashx是什么文件,如何创建 .ashx 文件用于写web handler的。其实就是带HTML和C#的混合文件。当然你完全可以用.aspx 的文件后缀。使用.ashx 可以让你专注于编程而不用管相关的WEB技术。.ashx必须包含IsReusable. 如下例所示

<% @ webhandler language="C#" class="AverageHandler" %>

using System;

using System.Web;

public class AverageHandler : IHttpHandler

{

public bool IsReusable

{ get { return true; } }

public void ProcessRequest(HttpContext ctx)

{

ctx.Response.Write("hello");

}

}.ashx比.aspx的好处在与不用多一个html// ----------------------------------------

// Pick your favorite image format

// ------------------------------

byte[]   byteArr = (byte[]) oChartSpace.GetPicture ("png", 500, 500);

// ----------------------------------------

// Store the chart image in Session to be picked up by an HttpHandler later

// ---------------------------------------

HttpContext      ctx = HttpContext.Current;

string           chartID = Guid.NewGuid ().ToString ();

ctx.Session [chartID] = byteArr;

imgHondaLineup.ImageUrl = string.Concat ("chart.ashx?", chartID);

chart.ashx里面就下面一句话

<% @ WebHandler language="C#" class="AspNetResources.Owc.ChartHandler" codebehind="chart.ashx.cs" %>

其实也可以用这个代替

在web.config里面的<system.web>里面加上

<httpHandlers>

   <add verb="*" path="*.ashx" type="AspNetResources.Owc, ChartHandler " validate="false" />

   <!--Since we are grabbing all requests after this, make sure Error.aspx does not rely on .Text -->

   <add verb="*" path="Error.aspx" type="System.Web.UI.PageHandlerFactory" />

</httpHandlers>

具体使用哪个都无所谓，后一种配置好了就方便一些，不用管路径了，其实这个思想的应用比较知名的在.text里面就已经有了，只不过应用的方向不同。

ashx.cs文件的代码

using System;

using System.Web.SessionState;

using System.IO;

using System.Web;

namespace AspNetResources.Owc

{

public class ChartHandler : IHttpHandler, IReadOnlySessionState

{

         public bool IsReusable

         {

             get { return true; }

         }

         public void ProcessRequest (HttpContext ctx)

         {

             string chartID = ctx.Request.QueryString[0];

             Array arr = (Array) ctx.Session [chartID];

             ctx.ClearError ();

             ctx.Response.Expires = 0;

             ctx.Response.Buffer = true;

             ctx.Response.Clear ();

             MemoryStream memStream = new MemoryStream ((byte[])arr);

             memStream.WriteTo (ctx.Response.OutputStream);

             memStream.Close ();

             ctx.Response.ContentType = "image/png";

             ctx.Response.StatusCode = 200;

             ctx.Response.End ();

         }

     }

}