asp.net通过反射技术实现Ajax

Ajax是时下热门的技术

asp.net框架下实现ajax有很多方式

今天想介绍一下自己设计的ajax实现方式(如有雷同纯属巧合)

首先看一个封装类,AjaxUtils

这个类封装了调用对象方法的反射机制.

传统ajax回传,对不同的方法调用会使用不同的url或webService

现在通过这个方法可以直接调用某个控件的内部方法

也就是说,可以调用任意页面上任意控件的任意方法,而且可以一次调用多个方法

    public class AjaxUtils    {        public static string CacheKey(Type type, string methodName)        {            return String.Format("AjaxMethod::Type:{0}-Method:{1}", type.Name, methodName);        }        public static void CallAjaxMethod(object target, params string[] methodName)        {            CallAjaxMethod(target, true, methodName);        }        public static void CallAjaxMethod(object target,bool userCache,params string[] methodName)        {            if (methodName == null || methodName.Length == 0)                return;            List<MethodBase> ajaxMethods = new List<MethodBase>();            BindingFlags bfs = BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.ExactBinding;            for (int i = 0; i < methodName.Length; i++)            {                if (string.IsNullOrEmpty(methodName[i]))                    continue;                Type type = target.GetType();                MethodBase method = null;                string cacheKey = CacheKey(type, methodName[i]);                if (userCache)                {                    method = WebCache.Get(cacheKey) as MethodBase;                }                if (method == null)                {                    RuntimeMethodHandle methodHandle = type.GetMethod(methodName[i], bfs).MethodHandle;                    method = MethodInfo.GetMethodFromHandle(methodHandle);                    WebCache.Insert(cacheKey, method, WebCache.HourFactor * 24);//将请求的方法缓存起来,下次不再通过反射寻找方法,而是直接调用                }                if (method != null)                    ajaxMethods.Add(method);            }            if (ajaxMethods.Count == 0)                return;            HttpResponse Response = HttpContext.Current.Response;            HttpRequest Request = HttpContext.Current.Request;            Response.Cache.SetNoStore();            Response.ContentType = "text/xml";      //返回xml响应            //xml响应格式:            //<ajax-response>            //  <response>            //  </response>            //</ajax-response>            StringBuilder builder = new StringBuilder("<ajax-response>");            foreach (MethodInfo method in ajaxMethods)      //循环调用方法            {                try                {                    object obj = null;                    try                    {                        obj = method.Invoke(target, new object[] { target, new EventArgs() });                    }                    catch (MethodAccessException ex)                    {                        Response.Clear();                        Response.StatusCode = 500;                        Response.StatusDescription = "ajax调用产生异常";                    }                    //如果方法有返回值,将返回值以xml子节点的形式返回                    if (obj != null)                    {                        string str = obj.ToString();                        //检查是否具有<response> 和 </response>元素,如果没有,添加元素                        if (!Regex.IsMatch(str, @"(^<response[/s]*>)|(^<response/s[^<>]+>).*?</response>"))                        {                            builder.Append("<response id=/"");                            builder.Append(method.Name);//表明xml响应是哪个方法返回的                            builder.Append("/" type=/"");                            builder.Append();//这里可以声明一些返回类型(如html,script等等)                            builder.Append("/" name=/"");                            builder.Append(method.Name);                            builder.Append("/">");                            builder.Append(str);                            builder.Append("</response>");                        }                        else                        {                            builder.Append(str);                        }                    }                }                catch(Exception ex)                {                    string str = ex.Message;                }            }            builder.Append("</ajax-response>");            Response.Write(builder.ToString());            Response.End();        }    }未完待续