I am adding a WebForm from which I would like to resolve routes to URLs. For example, in MVC I would just use
return RedirectToAction("Action", "Controller");
So, if you have a way of getting to that same URL from a WebForm in the same application, it would be appreciated.
Try something like this in your Webform:
<% var requestContext = new System.Web.Routing.RequestContext(
new HttpContextWrapper(HttpContext.Current),
new System.Web.Routing.RouteData());
var urlHelper = new System.Web.Mvc.UrlHelper(requestContext); %>
<%= urlHelper.RouteUrl(new { controller = "Controller", action = "Action" }) %>
Revised version of the code above for PageCommon ... as it currently is it breaks.
public static class MvcPages{
public static UrlHelper GetUrlHelper(this System.Web.UI.Control c)
{
var helper = new System.Web.Mvc.UrlHelper(c.Page.Request.RequestContext);
return helper;
}
public static HtmlHelper GetHtmlHelper(this System.Web.UI.Control c)
{
var httpContext = new HttpContextWrapper(HttpContext.Current);
var controllerContext = new ControllerContext(httpContext, new RouteData(), new DummyController());
var viewContext = new ViewContext(controllerContext, new WebFormView(controllerContext, "View"), new ViewDataDictionary(), new TempDataDictionary(), TextWriter.Null);
var helper = new HtmlHelper(viewContext, new ViewDataBag());
return helper;
}
private class ViewDataBag : IViewDataContainer
{
ViewDataDictionary vdd = new ViewDataDictionary();
public ViewDataDictionary ViewData
{
get
{
return vdd;
}
set
{
vdd = value;
}
}
}
private class DummyController : Controller
{
}
}
If you want to stay away from any MVC dependencies then this is the solution I came up with. It's very close to the accepted answer. I have a class my webform pages inherit and this UrlHelper is available in the ASPX pages.
using System.Net.Http;
using System.Web;
using System.Web.Http.Routing;
public class ClassOtherPagesInherit {
public UrlHelper Url = new UrlHelper(new HttpRequestMessage(new HttpMethod(HttpContext.Current.Request.HttpMethod), HttpContext.Current.Request.Url));
}
Then you can call this UrlHelper object like this
<%Url.Route("string", new {}) %>
For those looking for an actual HtmlHelper or a cleaner way to use the urlHelper in a page:
public static class PageCommon
{
public static System.Web.Mvc.UrlHelper GetUrlHelper(this System.Web.UI.Control c)
{
var helper = new System.Web.Mvc.UrlHelper(c.Page.Request.RequestContext);
return helper;
}
class ViewDataBag : IViewDataContainer
{
ViewDataDictionary vdd = new ViewDataDictionary();
public ViewDataDictionary ViewData
{
get
{
return vdd;
}
set
{
vdd = value;
}
}
}
public static System.Web.Mvc.HtmlHelper GetHtmlHelper(this System.Web.UI.Control c)
{
var v = new System.Web.Mvc.ViewContext();
var helper = new System.Web.Mvc.HtmlHelper(v, new ViewDataBag());
return helper;
}
}
Related
I need to run some code to further databind some model after the default model binding is done. I don't want to completely replace the existing model binding.
This question explains how this is done in pre-CORE ASP.NET:
ASP.NET MVC - Mixing Custom and Default Model Binding
However that approach doesn't seem to work in ASP.NET Core because there is no DefaultModelBinder class any more.
What alternative can be used in ASP.NET Core?
You can leverage the ComplexTypeModelBinder to do the actual work, then inject your own logic after it is done.
For example (assuming your custom type is MyCustomType):
public class MyCustomType
{
public string Foo { get; set; }
}
public class MyCustomTypeModelBinder : IModelBinder
{
private readonly IDictionary<ModelMetadata, IModelBinder> _propertyBinders;
public MyCustomTypeModelBinder(IDictionary<ModelMetadata, IModelBinder> propertyBinders)
{
this._propertyBinders = propertyBinders;
}
public async Task BindModelAsync(ModelBindingContext bindingContext)
{
var complexTypeModelBinder = new ComplexTypeModelBinder(this._propertyBinders);
// call complexTypeModelBinder
await complexTypeModelBinder.BindModelAsync(bindingContext);
var modelBound = bindingContext.Model as MyCustomType;
// do your own magic here
modelBound.Foo = "custominjected";
}
}
public class MyCustomTypeModelBinderProvider : IModelBinderProvider
{
public IModelBinder GetBinder(ModelBinderProviderContext context)
{
if (context.Metadata.ModelType == typeof(MyCustomType))
{
var propertyBinders = new Dictionary<ModelMetadata, IModelBinder>();
for (var i = 0; i < context.Metadata.Properties.Count; i++)
{
var property = context.Metadata.Properties[i];
propertyBinders.Add(property, context.CreateBinder(property));
}
return new MyCustomTypeModelBinder(propertyBinders);
}
return null;
}
}
Then register it:
services.AddMvc(options =>
{
options.ModelBinderProviders.Insert(0, new MyCustomTypeModelBinderProvider());
});
I implemented custom IIdentityMessageService class. My implementation simply put messages into database. I use Dependency resolver to create instance of repository class.
public class QueueSmsService : IIdentityMessageService
{
public Task SendAsync(IdentityMessage message)
{
var smsRepository = DependencyResolver.Current.GetService<ISmsRepository>();
Sms smsMessage = new Sms()
{
Priority = (int)MessagePriority.High,
NumberTo = message.Destination,
Body = message.Body
};
return smsRepository.InsertAndSubmitAsync(smsMessage);
}
}
Unfortunately there is a problem with HttpContext being null. Maybe if I inject repository in contructor would solve the problem? Can I somehow inject repository in contructor? Maybe there is another solution to eliminate the HttpContect == null problem? Right now QueueSmsService is created like below in:
var manager = new AppUserManager(new AppUserStore(context.Get<DataContext>()));
manager.RegisterTwoFactorProvider("SMS", new PhoneNumberTokenProvider<User, int>
{
MessageFormat = "Kod autentykujący: {0}"
});
manager.EmailService = new QueueEmailService();
manager.SmsService = new QueueSmsService();
HttpContext is used in repository class
public abstract class RepositoryBase<T> : IRepositoryBase<T> where T : class
{
private IDataContext dataContext;
private readonly IHttpContextFactory httpContextFactory;
protected static Logger logger = LogManager.GetCurrentClassLogger();
public RepositoryBase(IDataContext dataContext, IHttpContextFactory httpContext)
{
if (httpContext == null) throw new ArgumentNullException("httpContextFactory");
this.httpContextFactory = httpContext;
this.dataContext = dataContext;
}
(...)
Where the DataContxtFactory is simply
public class HttpContextFactory : IHttpContextFactory
{
public HttpContextBase Create()
{
return new HttpContextWrapper(HttpContext.Current);
}
}
And the error is reported exactly in the code above.
I'm new to NHibernate and trying to use it in ASP.NET WEB API. Firstly I used it successfully with one table named "Category" which the controller class is as follow:
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Web.Http;
using TestMVCProject.Web.Api.HttpFetchers;
using TestMVCProject.Web.Api.Models;
using TestMVCProject.Web.Api.TypeMappers;
using TestMVCProject.Web.Common;
//using TestMVCProject.Web.Common.Security;
using NHibernate;
namespace TestMVCProject.Web.Api.Controllers
{
[LoggingNHibernateSession]
public class CategoryController : ApiController
{
private readonly ISession _session;
private readonly ICategoryMapper _categoryMapper;
private readonly IHttpCategoryFetcher _categoryFetcher;
public CategoryController(
ISession session,
ICategoryMapper categoryMapper,
IHttpCategoryFetcher categoryFetcher)
{
_session = session;
_categoryMapper = categoryMapper;
_categoryFetcher = categoryFetcher;
}
public IEnumerable<Category> Get()
{
return _session
.QueryOver<Data.Model.Category>()
.List()
.Select(_categoryMapper.CreateCategory)
.ToList();
}
public Category Get(long id)
{
var category = _categoryFetcher.GetCategory(id);
return _categoryMapper.CreateCategory(category);
}
public HttpResponseMessage Post(HttpRequestMessage request, Category category)
{
var modelCategory = new Data.Model.Category
{
Description = category.Description,
CategoryName = category.CategoryName
};
_session.Save(modelCategory);
var newCategory = _categoryMapper.CreateCategory(modelCategory);
//var href = newCategory.Links.First(x => x.Rel == "self").Href;
var response = request.CreateResponse(HttpStatusCode.Created, newCategory);
//response.Headers.Add("Location", href);
return response;
}
public HttpResponseMessage Delete()
{
var categories = _session.QueryOver<Data.Model.Category>().List();
foreach (var category in categories)
{
_session.Delete(category);
}
return new HttpResponseMessage(HttpStatusCode.OK);
}
public HttpResponseMessage Delete(long id)
{
var category = _session.Get<Data.Model.Category>(id);
if (category != null)
{
_session.Delete(category);
}
return new HttpResponseMessage(HttpStatusCode.OK);
}
public Category Put(long id, Category category)
{
var modelCateogry = _categoryFetcher.GetCategory(id);
modelCateogry.CategoryName = category.CategoryName;
modelCateogry.Description = category.Description;
_session.SaveOrUpdate(modelCateogry);
return _categoryMapper.CreateCategory(modelCateogry);
}
}
}
But when I add The "Product" table which has a foreign key of the Category table, the product controller doesn't work and throws below exception:
No session bound to the current context
ProductController class is as follow:
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Web.Http;
using TestMVCProject.Web.Api.HttpFetchers;
using TestMVCProject.Web.Api.Models;
using TestMVCProject.Web.Api.TypeMappers;
using TestMVCProject.Web.Common;
//using TestMVCProject.Web.Common.Security;
using NHibernate;
namespace TestMVCProject.Web.Api.Controllers
{
[LoggingNHibernateSession]
public class ProductController : ApiController
{
private readonly ISession _session;
private readonly IProductMapper _productMapper;
private readonly IHttpProductFetcher _productFetcher;
public ProductController(
ISession session,
IProductMapper productMapper,
IHttpProductFetcher productFetcher)
{
_session = session;
_productMapper = productMapper;
_productFetcher = productFetcher;
}
public IEnumerable<Product> Get()
{
return _session
.QueryOver<Data.Model.Product>()
.List()
.Select(_productMapper.CreateProduct)
.ToList();
}
public Product Get(long id)
{
var product = _productFetcher.GetProduct(id);
return _productMapper.CreateProduct(product);
}
public HttpResponseMessage Post(HttpRequestMessage request, Product product)
{
var modelProduct = new Data.Model.Product
{
Description = product.Description,
ProductName = product.ProductName
};
_session.Save(modelProduct);
var newProduct = _productMapper.CreateProduct(modelProduct);
//var href = newproduct.Links.First(x => x.Rel == "self").Href;
var response = request.CreateResponse(HttpStatusCode.Created, newProduct);
//response.Headers.Add("Location", href);
return response;
}
public HttpResponseMessage Delete()
{
var categories = _session.QueryOver<Data.Model.Product>().List();
foreach (var product in categories)
{
_session.Delete(product);
}
return new HttpResponseMessage(HttpStatusCode.OK);
}
public HttpResponseMessage Delete(long id)
{
var product = _session.Get<Data.Model.Product>(id);
if (product != null)
{
_session.Delete(product);
}
return new HttpResponseMessage(HttpStatusCode.OK);
}
public Product Put(long id, Product product)
{
var modelProduct = _productFetcher.GetProduct(id);
modelProduct.ProductName = product.ProductName;
modelProduct.Description = product.Description;
_session.SaveOrUpdate(modelProduct);
return _productMapper.CreateProduct(modelProduct);
}
}
}
and the mapping class for Product table:
using TestMVCProject.Data.Model;
using FluentNHibernate.Mapping;
namespace TestMVCProject.Data.SqlServer.Mapping
{
public class ProductMap : ClassMap<Product>
{
public ProductMap()
{
Id(x => x.ProductId);
Map(x => x.ProductName).Not.Nullable();
Map(x => x.Description).Nullable();
Map(x => x.CreateDate).Not.Nullable();
Map(x => x.Price).Not.Nullable();
References<Category>(x => x.CategoryId).Not.Nullable();
}
}
}
What is wrong?
Your snippets are missing the way, how the ISessionFactory is created and how ISession is passed into your controllers... You should follow this really comprehensive story (by Piotr Walat):
NHibernate session management in ASP.NET Web API
Where you can see that we, can use 2.3. Contextual Sessions:
NHibernate.Context.WebSessionContext - stores the current session in HttpContext. You are responsible to bind and unbind an ISession instance with static methods of class CurrentSessionContext.
The configuration
<session-factory>
..
<property name="current_session_context_class">web</property>
</session-factory>
In the article you can check that we need at the app start initialize factory (just an extract):
public class WebApiApplication : System.Web.HttpApplication
{
private void InitializeSessionFactory() { ... }
protected void Application_Start()
{
InitializeSessionFactory();
...
Next we should create some AOP filter (just an extract):
public class NhSessionManagementAttribute : ActionFilterAttribute
{
...
public override void OnActionExecuting(HttpActionContext actionContext)
{
// init session
var session = SessionFactory.OpenSession();
...
public override void OnActionExecuted(HttpActionExecutedContext actionExecutedContext)
{
// close session
...
session = CurrentSessionContext.Unbind(SessionFactory);
}
For more details check the source mentioned above
Your approach of passing the session to the constructor of the controller factory does not seems to be working, there are a few ways to do this
1. Using dependency injection
If you are using a dependency injection framework, you have to configure controller so that it's constructed per request, it should looks like this (I have used the code for Ninject)
Step 1 - setup the session for injection
public class DIModule : NinjectModule
{
public override void Load()
{
this.Bind<ISessionFactory>()... bind to the session factory
this.Bind<ISession>().ToMethod(ctx => ctx.Kernel.Get<ISessionFactory>().OpenSession())
.InRequestScope();
}
private ISession CreateSessionProxy(IContext ctx)
{
var session = (ISession)this.proxyGenerator.CreateInterfaceProxyWithoutTarget(typeof(ISession), new[] { typeof(ISessionImplementor) }, ctx.Kernel.Get<SessionInterceptor>());
return session;
}
}
Step 2 - Create the controller factory so that it will inject the session when resolving
public class NinjectControllerFactory : DefaultControllerFactory, IDependencyResolver
{
private IDependencyResolver _defaultResolver;
public NinjectControllerFactory(IDependencyResolver defaultResolver)
{
_defaultResolver = defaultResolver;
}
protected override IController GetControllerInstance(RequestContext requestContext, Type controllerType)
{
return controllerType == null
? null
: (IController)DependencyKernel.Kernel.Get(controllerType);
}
public IDependencyScope BeginScope()
{
return this;
}
public object GetService(Type serviceType)
{
try
{
return DependencyKernel.Kernel.Get(serviceType);
}
catch (Exception)
{
return GetService(serviceType);
}
}
public IEnumerable<object> GetServices(Type serviceType)
{
try
{
object item = DependencyKernel.Kernel.Get(serviceType);
return new List<object>() {item};
}
catch (Exception)
{
return GetServices(serviceType);
}
}
public void Dispose()
{
}
}
Step 3 - Register the controller factory
public class MvcApplication : System.Web.HttpApplication
{
protected void Application_Start()
{
var factory = new NinjectControllerFactory(GlobalConfiguration.Configuration.DependencyResolver);
ControllerBuilder.Current.SetControllerFactory(factory);
GlobalConfiguration.Configuration.DependencyResolver = factory;
}
}
Now what will happen is that when your controller is created it will inject the a new NH session per each request.
2. Using a filter
This is much simpler, but you may need to change your controllers a bit this to work,
Step 1 - Setup the correct session context for the factory
_sessionFactory = CreateConfiguration()
.ExposeConfiguration(c => c.SetProperty("current_session_context_class","web"))
.BuildSessionFactory();
Step 2 - Create the filter
public class SessionPerRequestAttribute : ActionFilterAttribute
{
public override void OnActionExecuting(HttpActionContext actionContext)
{
var session = SessionFactory.OpenSession();
NHibernate.Context.CurrentSessionContext.Bind(session);
base.OnActionExecuting(actionContext);
}
public override void OnActionExecuted(HttpActionExecutedContext actionExecutedContext)
{
var session = SessionFactory.GetCurrentSession();
session.Flush();
session.Clear();
session.Close();
base.OnActionExecuted(actionExecutedContext);
}
}
Step 3 - Register the filter in global configuration
public static class WebApiConfig
{
public static void Register(HttpConfiguration config)
{
//Do other config here
config.Filters.Add(new SessionPerRequestAttribute());
}
}
Step 4 - Modify your controller a bit,
public class CategoryController : ApiController
{
private readonly ICategoryMapper _categoryMapper;
private readonly IHttpCategoryFetcher _categoryFetcher;
public CategoryController(
ICategoryMapper categoryMapper,
IHttpCategoryFetcher categoryFetcher)
{
_categoryMapper = categoryMapper;
_categoryFetcher = categoryFetcher;
}
public IEnumerable<Category> Get()
{
var session = SessionFactory.GetCurrentSession();
return session
.QueryOver<Data.Model.Category>()
.List()
.Select(_categoryMapper.CreateCategory)
.ToList();
}
}
Here what happens is, when a request comes it will create a new session and it is bound to the request context and same is used for the web API method.
is it possible to get the result of an action into a string variable
I need something like this:
public ActionResult Do()
{
var s = this.Index().GetStringResult();
...
}
Omu - try these for size:
public static class ExtensionMethods
{
// usage
/*
var model = _repository.Find(x => x.PropertyID > 3).FirstOrDefault();
var test = this.RenderViewToString("DataModel", model);
return Content(test);
*/
public static string RenderViewToString<T>(this ControllerBase controller,
string viewName, T model)
{
using (var writer = new StringWriter())
{
ViewEngineResult result = ViewEngines
.Engines
.FindView(controller.ControllerContext,
viewName, null);
var viewPath = ((WebFormView)result.View).ViewPath;
var view = new WebFormView(viewPath);
var vdd = new ViewDataDictionary<T>(model);
var viewCxt = new ViewContext(
controller.ControllerContext,
view,
vdd,
new TempDataDictionary(), writer);
viewCxt.View.Render(viewCxt, writer);
return writer.ToString();
}
}
public static string RenderPartialToString<T>(
this ControllerBase controller,
string partialName, T model)
{
var vd = new ViewDataDictionary(controller.ViewData);
var vp = new ViewPage
{
ViewData = vd,
ViewContext = new ViewContext(),
Url = new UrlHelper(controller.ControllerContext.RequestContext)
};
ViewEngineResult result = ViewEngines
.Engines
.FindPartialView(
controller.ControllerContext,
partialName);
if (result.View == null)
{
throw new InvalidOperationException(
string.Format("The partial view '{0}' could not be found",
partialName));
}
var partialPath = ((WebFormView)result.View).ViewPath;
vp.ViewData.Model = model;
Control control = vp.LoadControl(partialPath);
vp.Controls.Add(control);
var sb = new StringBuilder();
using (var sw = new StringWriter(sb))
{
using (var tw = new HtmlTextWriter(sw))
{
vp.RenderControl(tw);
}
}
return sb.ToString();
}
}
usage (normal view):
var s = this.RenderViewToString("Index", null); // or model if required
and for a partial:
var s = this.RenderPartialToString("PartialView, model) // etc
Why not take the Index action and extract all it's code into a seperate function like this:
public ActionResult Index()
{
Response.Write(GetActionString());
return new EmptyResult();
}
private void GetActionString()
{
//Code which produces the index string;
}
public ActionResult Do()
{
var s = GetActionString();
...
return View();
}
If you are in need of the rendered HTML from index after it has been passed to a view then you will need to create an HttpRequest in code and read the result from this.
I've got a thread that sends emails around. I need to generate ActionLinks as part of the content of the email so the user can click on the link and be redirected to the website, exactly to the required page. I tried to instantiate a UrlHelper class and use it's Action method to generate the link but since threads don't run within the context of any request I get exceptions at the time of generating the ActionLink.
How can I do this?
You need to fake HttpContextBase and pass this to an UrlHelper which you can use in a thread without an HttpContext. Here is the rough idea, although you will need to create a class around it etc, this is a quick proof of concept as unit tests don't have an HttpContext either.
[TestFixture]
public class RouteTestClass
{
private UrlHelper helper;
public RouteTestClass()
{
MvcApplication.RegisterRoutes(RouteTable.Routes); //You dont need to do this if its done in global.asax!
var c = new RequestContext(new FakeContext(), new RouteData());
helper = new UrlHelper(c, RouteTable.Routes);
}
[Test]
public void TestGetHomeIndex()
{
var url = helper.Action("Index", "Home");
Assert.AreEqual("/",url);
}
}
public class FakeContext : HttpContextBase
{
public override HttpRequestBase Request { get { return new FakeRequest(); } }
public override HttpResponseBase Response { get { return new FakeResponse(); } }
}
public class FakeRequest : HttpRequestBase
{
public override string ApplicationPath { get { return "/"; } }
public override NameValueCollection ServerVariables { get { return new NameValueCollection(); } }
}
public class FakeResponse : HttpResponseBase
{
public override string ApplyAppPathModifier(string virtualPath)
{
return virtualPath;
}
}
Edit
Looking at this answer, I tidied the code up a little as I don't need to create fakes for HttpRequestBase and HttpResponseBase myself.
[TestFixture]
public class RouteTestClass
{
private UrlHelper helper;
public RouteTestClass()
{
MvcApplication.RegisterRoutes(RouteTable.Routes);
var req = new HttpRequest("/", "http://www.yoururl.com", "");
var resp = new HttpResponse(new StringWriter());
var httpContext = new HttpContext(req, resp);
var c = new RequestContext(new HttpContextWrapper(httpContext), new RouteData());
helper = new UrlHelper(c, RouteTable.Routes);
}
[Test]
public void TestGetHomeIndex()
{
var url = helper.Action("Index", "Home");
Assert.AreEqual("/",url);
}
}
You can give the thread access to an existing UrlHelper by passing it to the thread starter. If your thread is started from a controller, just pass the UrlHelper in the controller's Url property:
new Thread(
urlHelper =>
{
var url =
((UrlHelper)urlHelper)
.Action("Index", "Home", new { Id = 5 });
// use url here
}
).Start(Url);