给定一个HttpContext(或HttpContextBase)，有没有办法获得一个Controller的实例？
解决方法
HttpContext将保存对MvcHandler的引用，该引用将保存对RouteData的引用，该引用将保存对特定路由正在调用什么控制器的引用。
NB: This doesn’t give you the actual controller,only the controller
that the specific route is going to
catch.
GetController(HttpContextBase httpContext)
{
var routeData = ((MvcHandler)httpContext.Handler).RequestContext.RouteData;
var routeValues = routeData.Values;
var matchedRouteBase = routeData.Route;
var matchedRoute = matchedRouteBase as Route;
if (matchedRoute != null)
{
Route = matchedRoute.Url ?? string.Empty;
}
AssignRouteValues(httpContext,routeValues);
}
protected virtual VirtualPathData getVirtualPathData(HttpContextBase httpContext,RouteValueDictionary routeValues)
{
return RouteTable.Routes.GetVirtualPath(((MvcHandler)httpContext.Handler).RequestContext,routeValues);
}
private void AssignRouteValues(HttpContextBase httpContext,RouteValueDictionary routeValues)
{
var virtualPathData = getVirtualPathData(httpContext,routeValues);
if (virtualPathData != null)
{
var vpdRoute = virtualPathData.Route as Route;
if (vpdRoute != null)
{
RouteDefaults = vpdRoute.Defaults;
RouteConstraints = vpdRoute.Constraints;
RouteDataTokens = virtualPathData.DataTokens;
RouteValues = routeValues;
}
}
}
这段代码可能看起来很熟悉，这是因为我已经适应了Phil Haack的route debugger源代码。
