【原】在一般处理程序中设置session

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Web;

namespace Itcast.Mall.WebApp.Handlers
{
/// <summary>
/// Vcode 的摘要说明
/// </summary>
public class Vcode : IHttpHandler,System.Web.SessionState.IRequiresSessionState
{

public void ProcessRequest(HttpContext context)
{
var code = CaptchaHelper.CreateRandomCode(4);
//类要实现System.Web.SessionState.IRequiresSessionState，这个才能设置session，否则会报错；
context.Session["user_vcode"] = code;
var img = CaptchaHelper.DrawImage(code, 20, background: Color.White);
context.Response.ContentType = "image/gif";
context.Response.BinaryWrite(img);

}

public bool IsReusable
{
get
{
return false;
}
}
}
}