internal IHttpHandler GetHttpHandler(HttpContext context, UrlActionInfo info)
{
if (context == null)
{
throw new ArgumentNullException("context");
}
if (info == null)
{
throw new ArgumentNullException("info");
}
// 获取内部表示的调用信息
ControllerResolver controllerResolver = new ControllerResolver(context);
InvokeInfo vkInfo = controllerResolver.GetActionInvokeInfo(info);
if (vkInfo == null)
{
IHttpHandler handler = Http404DebugModule.TryGetHttp404PageHandler(context);
if (handler != null)
{
return(handler);
}
else
{
return(null);
}
}
// 创建能够调用Action的HttpHandler
return(ActionHandlerFactory.CreateHandler(vkInfo));
}
void app_PostResolveRequestCache(object sender, EventArgs e)
{
HttpApplication app = (HttpApplication)sender;
HttpContext context = app.Context;
// 如果已经被处理过了，就不再处理。
if (context.Handler != null)
{
return;
}
string virtualPath = context.GetRealVirtualPath();
// 检查有没有匹配的路由规则
RouteData routeData = GetRoute(context, virtualPath);
if (routeData == null)
{
return; // 没有就忽略，重新交给ASP.NET管线继续处理。
}
MvcRouteHandler routeHandler = routeData.RouteHandler as MvcRouteHandler;
if (routeHandler == null)
{
//return; // 忽略就会产生404错误了。因此为了排查方便，抛出异常。
throw new InvalidProgramException("使用ClownFish.Web.MvcRoutingModule时，必须指定MvcRouteHandler");
}
UrlActionInfo info = routeHandler.GetUrlActionInfo(routeData, context);
info.SetHttpcontext(context);
IHttpHandler handler = routeHandler.GetHttpHandler(context, info);
if (handler != null)
{
context.RemapHandler(handler);
}
else
{
ExceptionHelper.Throw404Exception(context);
}
}
/// <summary>
/// 实现IHttpHandlerFactory接口，从当前请求获取IHttpHandler
/// </summary>
/// <param name="context"></param>
/// <param name="requestType"></param>
/// <param name="virtualPath"></param>
/// <param name="physicalPath"></param>
/// <returns></returns>
public IHttpHandler GetHandler(HttpContext context,
string requestType, string virtualPath, string physicalPath)
{
// 说明：这里不使用virtualPath变量，因为不同的配置，这个变量的值会不一样。
// 例如：/Ajax/*/*.aspx 和 /Ajax/*
// 为了映射HTTP处理器，下面直接使用context.Request.Path
string vPath = context.GetRealVirtualPath();
// 根据请求路径，定位到要执行的Action
UrlActionInfo info = ParseUrl(context, vPath);
if (info == null)
{
IHttpHandler handler = Http404DebugModule.TryGetHttp404PageHandler(context);
if (handler != null)
{
return(handler);
}
ExceptionHelper.Throw404Exception(context);
}
info.SetHttpcontext(context);
// 获取内部表示的调用信息
ControllerResolver controllerResolver = new ControllerResolver(context);
InvokeInfo vkInfo = controllerResolver.GetActionInvokeInfo(info);
if (vkInfo == null)
{
IHttpHandler handler = Http404DebugModule.TryGetHttp404PageHandler(context);
if (handler != null)
{
return(handler);
}
ExceptionHelper.Throw404Exception(context);
}
// 创建能够调用Action的HttpHandler
return(ActionHandlerFactory.CreateHandler(vkInfo));
}
/// <summary>
/// 实现IRouteHandler接口
/// </summary>
/// <param name="requestContext"></param>
/// <returns></returns>
public IHttpHandler GetHttpHandler(RequestContext requestContext)
{
HttpContext context = requestContext.HttpContext.ApplicationInstance.Context;
UrlActionInfo info = GetUrlActionInfo(requestContext.RouteData, context);
if (info == null)
{
IHttpHandler handler = Http404DebugModule.TryGetHttp404PageHandler(context);
if (handler != null)
{
return(handler);
}
ExceptionHelper.Throw404Exception(context);
}
info.SetHttpcontext(context);
return(GetHttpHandler(context, info));
}
internal UrlActionInfo GetUrlActionInfo(RouteData routeData, HttpContext context)
{
if (routeData == null)
{
throw new ArgumentNullException("routeData");
}
if (context == null)
{
throw new ArgumentNullException("context");
}
// 采用ASP.NET Routing后，这三个参数都应该可以直接获取到，
// 如果URL没有指定，可以通过默认值，或者DataToken指定，
// 所以不需要像RestServiceModule那样重新计算
string nspace = GetRouteString(routeData, "namespace");
string className = GetRouteString(routeData, "controller");
string action = GetRouteString(routeData, "action");
if (string.IsNullOrEmpty(className) || string.IsNullOrEmpty(action))
{
DiagnoseResult diagnoseResult = Http404DebugModule.TryGetDiagnoseResult(context);
if (diagnoseResult != null)
{
diagnoseResult.ErrorMessages.Add("不能从URL中提取到controller和action信息");
}
return(null);
}
if (action == "{HttpMethod}") // 允许定义这个特殊变量
{
action = context.Request.HttpMethod;
}
ControllerResolver controllerResolver = new ControllerResolver(context);
UrlActionInfo info = new UrlActionInfo();
info.RoutePattern = (routeData.Route as Route).Url; // 转换失败？？
info.Namesapce = controllerResolver.GetNamespaceMap(nspace);
info.ClassName = className;
info.MethodName = action;
info.Action = action;
info.Controller = s_recognizer.GetServiceFullName(info);
// 将路由提取到的其它URL参数，保存到UrlActionInfo实例中。
foreach (KeyValuePair <string, object> kvp in routeData.Values)
{
// 排除3个特定名字。
if (kvp.Key.EqualsIgnoreCase("namespace") || kvp.Key.EqualsIgnoreCase("controller") || kvp.Key.EqualsIgnoreCase("action"))
{
continue;
}
string value = kvp.Value as string;
if (string.IsNullOrEmpty(value) == false)
{
info.AddParam(kvp.Key, value);
}
}
return(info);
}