一般处理程序指定方法调用

public void ProcessRequest(HttpContext context)
    {
        context.Response.Cache.SetCacheability(HttpCacheability.NoCache);
        context.Response.ContentType = "text/json";
        context.Response.Charset = "UTF-8";

        string action = context.Request.Params["method"];
        try
        {
            if (action == null || action == "") throw new Exception("method不能为空");

            Type htype = this.GetType();
            MethodInfo method = htype.GetMethod(action);

            if (method == null) throw new Exception("未提供此功能");

            method.Invoke(this, new object[] { context });
        }
        catch (Exception ex)
        {
            context.Response.Clear();
            context.Response.Write(JsonHelper.ReturnJson(false, ex.Message, ""));
        }
        finally
        {
            context.Response.End();//处理完成，返回Response
        }

    }