Mixing
Use ASP.NET Core 2.1 UrlHelper in ApplicationStarted event outside of controllers to warmup Kestrel
Building MVC urls in IApplicationLifetime.ApplicationStarted event tryping different things always ended inexceptions. For example
public void ConfigureServices(IServiceCollection services) {
services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);
services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();
services.AddSingleton<IActionContextAccessor, ActionContextAccessor>();
}
public void Configure(IApplicationBuilder app, IHostingEnvironment env, IApplicationLifetime appLife, IServiceProvider serviceProvider) {
appLife.ApplicationStarted.Register(() => {
var helperFactory = serviceProvider.GetService<IUrlHelperFactory>();
var ctx = serviceProvider.GetService<IActionContextAccessor>();
});
}
System.ObjectDisposedException: "Cannot access a disposed object."
IActionContextAccessor seems to be the problem: Since we're not in a http request, no ActionContext is avaliable. When directly injecting IActionContextAccessor to Configure, I got an object. But It's property ActionContext is null, which would be required for UrlHelper constructor:
var helper = new UrlHelper(actionContext.ActionContext);
Since only need information about routing were required from those context, I tried to create some kind of fake context with my routes
IRouter localRoutes;
public void Configure(IApplicationBuilder app, IHostingEnvironment env, IApplicationLifetime appLife, IServiceProvider serviceProvider) {
appLife.ApplicationStarted.Register(() => {
var routeData = new RouteData();
routeData.PushState(localRoutes, new RouteValueDictionary(), new RouteValueDictionary());
var urlHelperFactory = app.ApplicationServices.GetRequiredService<IUrlHelperFactory>();
IUrlHelper helper = urlHelperFactory.GetUrlHelper(
new ActionContext(
new DefaultHttpContext(),
routeData,
new ActionDescriptor() { })
);
string url = helper.Action("Index", "Home");
});
app.UseMvc(routes => {
routes.MapRoute(
name: "default",
template: "{controller=Dashboard}/{action=Index}/{id?}");
localRoutes = routes.Build();
});
}
At the helper.Action call it generates some exception:
System.ArgumentNullException: "Value cannot be null."
Don't know how to fix this. I don't want to generate urls manually since changes need to apply on multiple places.
Background: Application warmup
My ASP.NET Core 2 app takes multiple seconds to serve the first request after startup, where following requests are pretty fast. Since this is not acceptable for user experience, I want to warmup my application.
The old 4.x IIS stack has preloadEnabled which is exactly was I need:
Specifies that IIS simulates a user request to the default page of an application or virtual directory so that it is initialized. [...]
Sadly it seems that there is no such an option for the new Kestrel webserver that can run on Linux, too. So I'd like to implement something like this on my own by making 2-3 requests.
c# asp.net-core dependency-injection asp.net-core-mvc asp.net-core-2.1
asked Jan 2 at 17:50
LionLion
3,54473162
add a comment |
Building MVC urls in IApplicationLifetime.ApplicationStarted event tryping different things always ended inexceptions. For example
public void ConfigureServices(IServiceCollection services) {
services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);
services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();
services.AddSingleton<IActionContextAccessor, ActionContextAccessor>();
}
public void Configure(IApplicationBuilder app, IHostingEnvironment env, IApplicationLifetime appLife, IServiceProvider serviceProvider) {
appLife.ApplicationStarted.Register(() => {
var helperFactory = serviceProvider.GetService<IUrlHelperFactory>();
var ctx = serviceProvider.GetService<IActionContextAccessor>();
});
}
System.ObjectDisposedException: "Cannot access a disposed object."
IActionContextAccessor seems to be the problem: Since we're not in a http request, no ActionContext is avaliable. When directly injecting IActionContextAccessor to Configure, I got an object. But It's property ActionContext is null, which would be required for UrlHelper constructor:
var helper = new UrlHelper(actionContext.ActionContext);
Since only need information about routing were required from those context, I tried to create some kind of fake context with my routes
IRouter localRoutes;
public void Configure(IApplicationBuilder app, IHostingEnvironment env, IApplicationLifetime appLife, IServiceProvider serviceProvider) {
appLife.ApplicationStarted.Register(() => {
var routeData = new RouteData();
routeData.PushState(localRoutes, new RouteValueDictionary(), new RouteValueDictionary());
var urlHelperFactory = app.ApplicationServices.GetRequiredService<IUrlHelperFactory>();
IUrlHelper helper = urlHelperFactory.GetUrlHelper(
new ActionContext(
new DefaultHttpContext(),
routeData,
new ActionDescriptor() { })
);
string url = helper.Action("Index", "Home");
});
app.UseMvc(routes => {
routes.MapRoute(
name: "default",
template: "{controller=Dashboard}/{action=Index}/{id?}");
localRoutes = routes.Build();
});
}
At the helper.Action call it generates some exception:
System.ArgumentNullException: "Value cannot be null."
Don't know how to fix this. I don't want to generate urls manually since changes need to apply on multiple places.
Background: Application warmup
My ASP.NET Core 2 app takes multiple seconds to serve the first request after startup, where following requests are pretty fast. Since this is not acceptable for user experience, I want to warmup my application.
The old 4.x IIS stack has preloadEnabled which is exactly was I need:
Specifies that IIS simulates a user request to the default page of an application or virtual directory so that it is initialized. [...]
Sadly it seems that there is no such an option for the new Kestrel webserver that can run on Linux, too. So I'd like to implement something like this on my own by making 2-3 requests.
c# asp.net-core dependency-injection asp.net-core-mvc asp.net-core-2.1
asked Jan 2 at 17:50
LionLion
3,54473162
You could just usestring url = "/Home/Index";.
– juunas
Jan 2 at 18:01
add a comment |
Building MVC urls in IApplicationLifetime.ApplicationStarted event tryping different things always ended inexceptions. For example
public void ConfigureServices(IServiceCollection services) {
services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);
services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();
services.AddSingleton<IActionContextAccessor, ActionContextAccessor>();
}
public void Configure(IApplicationBuilder app, IHostingEnvironment env, IApplicationLifetime appLife, IServiceProvider serviceProvider) {
appLife.ApplicationStarted.Register(() => {
var helperFactory = serviceProvider.GetService<IUrlHelperFactory>();
var ctx = serviceProvider.GetService<IActionContextAccessor>();
});
}
System.ObjectDisposedException: "Cannot access a disposed object."
IActionContextAccessor seems to be the problem: Since we're not in a http request, no ActionContext is avaliable. When directly injecting IActionContextAccessor to Configure, I got an object. But It's property ActionContext is null, which would be required for UrlHelper constructor:
var helper = new UrlHelper(actionContext.ActionContext);
Since only need information about routing were required from those context, I tried to create some kind of fake context with my routes
IRouter localRoutes;
public void Configure(IApplicationBuilder app, IHostingEnvironment env, IApplicationLifetime appLife, IServiceProvider serviceProvider) {
appLife.ApplicationStarted.Register(() => {
var routeData = new RouteData();
routeData.PushState(localRoutes, new RouteValueDictionary(), new RouteValueDictionary());
var urlHelperFactory = app.ApplicationServices.GetRequiredService<IUrlHelperFactory>();
IUrlHelper helper = urlHelperFactory.GetUrlHelper(
new ActionContext(
new DefaultHttpContext(),
routeData,
new ActionDescriptor() { })
);
string url = helper.Action("Index", "Home");
});
app.UseMvc(routes => {
routes.MapRoute(
name: "default",
template: "{controller=Dashboard}/{action=Index}/{id?}");
localRoutes = routes.Build();
});
}
At the helper.Action call it generates some exception:
System.ArgumentNullException: "Value cannot be null."
Don't know how to fix this. I don't want to generate urls manually since changes need to apply on multiple places.
Background: Application warmup
My ASP.NET Core 2 app takes multiple seconds to serve the first request after startup, where following requests are pretty fast. Since this is not acceptable for user experience, I want to warmup my application.
The old 4.x IIS stack has preloadEnabled which is exactly was I need:
Specifies that IIS simulates a user request to the default page of an application or virtual directory so that it is initialized. [...]
Sadly it seems that there is no such an option for the new Kestrel webserver that can run on Linux, too. So I'd like to implement something like this on my own by making 2-3 requests.
c# asp.net-core dependency-injection asp.net-core-mvc asp.net-core-2.1
asked Jan 2 at 17:50
LionLion
3,54473162
Building MVC urls in IApplicationLifetime.ApplicationStarted event tryping different things always ended inexceptions. For example
public void ConfigureServices(IServiceCollection services) {
services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);
services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();
services.AddSingleton<IActionContextAccessor, ActionContextAccessor>();
}
public void Configure(IApplicationBuilder app, IHostingEnvironment env, IApplicationLifetime appLife, IServiceProvider serviceProvider) {
appLife.ApplicationStarted.Register(() => {
var helperFactory = serviceProvider.GetService<IUrlHelperFactory>();
var ctx = serviceProvider.GetService<IActionContextAccessor>();
});
}
System.ObjectDisposedException: "Cannot access a disposed object."
IActionContextAccessor seems to be the problem: Since we're not in a http request, no ActionContext is avaliable. When directly injecting IActionContextAccessor to Configure, I got an object. But It's property ActionContext is null, which would be required for UrlHelper constructor:
var helper = new UrlHelper(actionContext.ActionContext);
Since only need information about routing were required from those context, I tried to create some kind of fake context with my routes
IRouter localRoutes;
public void Configure(IApplicationBuilder app, IHostingEnvironment env, IApplicationLifetime appLife, IServiceProvider serviceProvider) {
appLife.ApplicationStarted.Register(() => {
var routeData = new RouteData();
routeData.PushState(localRoutes, new RouteValueDictionary(), new RouteValueDictionary());
var urlHelperFactory = app.ApplicationServices.GetRequiredService<IUrlHelperFactory>();
IUrlHelper helper = urlHelperFactory.GetUrlHelper(
new ActionContext(
new DefaultHttpContext(),
routeData,
new ActionDescriptor() { })
);
string url = helper.Action("Index", "Home");
});
app.UseMvc(routes => {
routes.MapRoute(
name: "default",
template: "{controller=Dashboard}/{action=Index}/{id?}");
localRoutes = routes.Build();
});
}
At the helper.Action call it generates some exception:
System.ArgumentNullException: "Value cannot be null."
Don't know how to fix this. I don't want to generate urls manually since changes need to apply on multiple places.
Background: Application warmup
My ASP.NET Core 2 app takes multiple seconds to serve the first request after startup, where following requests are pretty fast. Since this is not acceptable for user experience, I want to warmup my application.
The old 4.x IIS stack has preloadEnabled which is exactly was I need:
Specifies that IIS simulates a user request to the default page of an application or virtual directory so that it is initialized. [...]
Sadly it seems that there is no such an option for the new Kestrel webserver that can run on Linux, too. So I'd like to implement something like this on my own by making 2-3 requests.
c# asp.net-core dependency-injection asp.net-core-mvc asp.net-core-2.1
c# asp.net-core dependency-injection asp.net-core-mvc asp.net-core-2.1
asked Jan 2 at 17:50
LionLion
3,54473162
asked Jan 2 at 17:50
LionLion
3,54473162
asked Jan 2 at 17:50
LionLion
3,54473162
asked Jan 2 at 17:50
LionLion
3,54473162
asked Jan 2 at 17:50
LionLion
3,54473162
3,54473162
You could just usestring url = "/Home/Index";.
– juunas
Jan 2 at 18:01
add a comment |
You could just usestring url = "/Home/Index";.
– juunas
Jan 2 at 18:01
You could just use
string url = "/Home/Index";.– juunas
Jan 2 at 18:01
You could just use
string url = "/Home/Index";.– juunas
Jan 2 at 18:01
add a comment |
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You could just use
string url = "/Home/Index";.– juunas
Jan 2 at 18:01