}
/// <summary>
/// 使用启用异步处理
/// </summary>
public bool IsAsync
{
get { return _isUseAsync; }
set { _isUseAsync = value; }
}
}
/// <summary>
/// Session状态
/// </summary>
public enum SessionState
{
None,
ReadOnly,
ReadWrite
}
/// <summary>
/// 输出内容类型
/// </summary>
public enum ContentType
{
Plain,
Html,
XML,
Javascript,
JSON
}
各种处理程序和AjaxHandlerFactory
按照上一篇的说法,具体的Handler主要分为两类,异步和非异步;这两类下,对于Session的状态又有3三种,不支持、
只支持读(实现IReadOnlySessionState接口)、支持读写(实现IRequiresSessionState接口)。IReadOnlySessionState和
IRequiresSessionState都只是标记接口(无任何方法,其实应该用标记属性实现比较合理)。异步的Handler需要实现
IHttpAsyncHandler接口,该接口又实现了IHttpHandler。Handler的ProcessRequest方法(或BeginProcessRequest)就是我们
要执行方法的地方。定义如下:
非异步状态的Handler:
//不支持Session
internal class SyncAjaxHandler : IHttpHandler
{
private Page _page;
private CacheMethodInfo _cacheMethodInfo;
internal SyncAjaxHandler(Page page, CacheMethodInfo cacheMethodInfo)
{
_page = page;
_cacheMethodInfo = cacheMethodInfo;
}
public void ProcessRequest(HttpContext context)
{
//执行方法(下面详细介绍)
Executor.Execute(_page, context, _cacheMethodInfo);
}
public bool IsReusable
{
get { return false; }
}
public static SyncAjaxHandler CreateHandler(Page page, CacheMethodInfo cacheMethodInfo, SessionState state)