我可以从HttpContext获取控制器吗？

Question

给定一个HttpContext(或HttpContextBase),有没有办法获取Controller的实例？

Answer 1

对于那些只是获取控制器名称而不是实际实例的人,如AuthorizeCore(httpContext)的自定义授权覆盖所需,这是干净的代码.

var request = httpContext.Request;
var currentUser = httpContext.User.Identity.Name;
string controller = request.RequestContext.RouteData.Values["controller"].ToString();
string action = request.RequestContext.RouteData.Values["action"].ToString();

Answer 2

在HttpContext将举行一个参考MvcHandler,这将举行一个参考RouteData,这将坚持正在由一个特定的路线调用什么控制器的引用.

注意: 这不会给你实际的控制器,只有特定路线要捕获的控制器.

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,因为我已经从Phil Haack的路由调试器源代码中修改了它.