To provide details regarding my platform. I am using Visual Studio 2017 with a .NET Core Web project.
I am implementing a new back-end for a client for which I cannot alter the client. I am attempting to use MVC to accomplish this.
The URL which I must be able to respond to is -> https://my.server.com:8443/portal/gateway?sessionId=0A6405100000001D04FB55FE&portal=4ba457d0-e371-11e6-92ce-005056873bd0&action=cwa&token=3fcbc246bb3c35a5fa8055fec6bbf431
I would like to extract the values for :
sessionId
portal
action
token
As they all have meaning.
I have created a new view folder within my project called "Portal" and have created a new MVC controller named "PortalController".
I have created a new View called gateway.cshtml and also have implemented the following function ->
public IActionResult Gateway(string sessionId, string portal, string action, string token)
{
ViewData["Message"] = "Gateway";
return View();
}
When I set a breakpoint within the function, I receive the following values for the URL provided above ->
sessionId "0A6405100000001D04FB55FE" string
portal "4ba457d0-e371-11e6-92ce-005056873bd0" string
action "gateway" string
token "3fcbc246bb3c35a5fa8055fec6bbf431" string
As can be seen in the output of the debugger, for the parameter named "action", isntead of receiving the value "cwa" as passed by the client, I instead receive the name "gateway" which is passed by MVC as the name of the action.
Is there a "proper way" of handling this?
I would prefer to avoid altering the routes within the startup.cs file as this hurts the modularity of the code. I would welcome attributes that could be used to reroute the parameter names.
Another alternative I could see (buy can't figure out) is to simply make use of the HTTP request to read the values I'm interested in instead of using function parameters.
Thank you very much in advance for any assistance you can provide!
In .Net Core you can get your action parameter value straight off the Request with
var action= Request.Query["action"];
where in .Net Framework it was
var action= Request.QueryString["action"];
Related
Good evening,
I have one scenario that i have a httpGet method with complex object and needs to call this from another .net project by passing Json object., Below is the sample.
APIController
[HttpGet]
[Route("GetName")]
public async Task<string> GetName([FromUri]MyClass myClass)
{
return myClass?.MyName?.ToString() + "this is my method result";
}
Postman
http://localhost/api/NameSearch/GetName?MyClass={'MyName':'TestName'}
I know this is very easy to achieve if i change the action from httpGet to httpPost., But this has been told that i am not doing any update within my api, so i should not use the Post. Also i should not be sending this as individual parameter like ?MyName=''&MySecondParam='',etc., The request has to be passed as single Json object to the API.
Please kindly suggest if there is any option. I tried the above ?MyClass={'MyName':'TestName'} which is not working.
Thanks in advance.
I want to convert our existing WCF REST web services to ASP.NET Web APIso I started to look into it.
Getting one of my function (i.e. login) up and running in ASP.NET Web API was quite straight forward but there is one thing I'm confused about and I hope one of you can clarify this for me.
In our WCF REST web service, our login (POST) function was called as follows:
http://localhost/mywebsite/mywebservice.svc/Authentication/Login
We'd pass a LoginRequest to it and we'd get a LoginResponse back.
Now in ASP.NET Web API, I've our Login (POST) function is being called as follows:
http://localhost/api/authentication and I'm passing the same LoginRequest and I get the same LoginResponse.
My confusion is, how does ASP.NET Web API know to use the Login function which is defined in the AuthenticationController?
I assume it has something to do with the parameter type being passed but what if I have another function that has the same parameter type, how would it differentiate between the 2?
For example, what if I had a LocalLogin and CloudLogin (not the case btw) and both require the LoginRequest as an input parameter and both return the LoginResponse, how would it know which one to call since it's not part of the URI?
Thanks.
My site is largely a suite of web services exposed via the Asp.Net Web API. There are also pages, designed to support the webservices (testing etc), written in Razor (and implicitly Asp.Net MVC 4).
For the XML versions of the webservices I have a schema-export action (uses the XsdDataContractExporter) which is picked up by my standard API route (although note - I've flipped the precedence of the Web API and Pages):
//page routes
routes.MapRoute(
"Default", // Route name
"pages/{controller}/{action}/{id}", // URL with parameters
new { controller = "Home",
action = "Index",
id = UrlParameter.Optional
} // Parameter defaults
);
//an additional route for my Schema controller action
routes.MapHttpRoute("XSD", "schema.xsd",
new { controller = "schema" });
//API Catch-all Route
routes.MapHttpRoute("APIMain", "{controller}/{id}",
new { id = RouteParameter.Optional });
Now on a razor page I want to emit a link to the 'friendly' schema URL ~/Schema.xsd. Anticipating issues with route discovery I immediately went for hitting the route directly by name:
#Html.RouteLink("Schema", "XSD");
However this just emits a link equivalent to ~/.
I've tried some other combinations of route values - but it appears MVC's HtmlHelper and UrlHelper simply don't want to pick up Web API routes.
I'm sure if I cracked open the source of Asp.Net MVC 4 I'd find the reason - but I'm hoping somebody already knows, and since I can't find another SO about such cross-linking I figured it'd be a good addition to the SO library.
I should add that browsing to ~/Schema and ~/Schema.xsd do correctly display the XML schema produced by the API action.
Update
Post-RC a method was added to MVC's UrlHelper, HttpRouteUrl, which does exactly the same thing I suggest here in this answer. This is my discussion thread over on CodePlex where I was told this. So there is no need for you to use the magic string mention here in generating links to Web API routes.
Original answer
I've managed to get it to work - although it might not by the time MVC 4 is RTMd (disclaimer disclaimer!)
I changed my Html.RouteLink call as follows:
#Html.RouteLink("XML request schema", "XSD", new { httproute = true })
I didn't originally intend to answer my own question straight away - but having done some research I found an answer.
First I verified that the HtmlHelper's route collection is the same as the RouteTable.Routes collection (i.e. contained all routes).
Following the call-chain through, I remembered having trawled through the current Web API and page MVC 4 source code from CodePlex, that HttpRoutes (in System.Web.Http.Routing) need a 'hidden' route value to be added otherwise they will never match. Here's the source code from lines 21-25 of HttpRoute class (correct as of 8th June 2012 source):
/// <summary>
/// Key used to signify that a route URL generation request should include HTTP routes (e.g. Web API).
/// If this key is not specified then no HTTP routes will match.
/// </summary>
internal const string HttpRouteKey = "httproute";
A bit of further analysis of the code showed that it expects this route value to be a boolean.
Clearly, this is something that can be turned into extension methods - perhaps Html.HttpRouteLink (and Html.HttpActionLink) - with extra extensions on UrlHelper for hiding the magic string for the route data value.
I am trying to extract an id number from a URL using a web service so that it can be used as a parameter for a where clause in a select statement that produces data from a database based on the id number of a record. That data will then be passed back to the page to populate an element in a jQuery modal popup widow.
Everything works fine with a static id number (ex: string postid = "120"), but I don't know how to get the id number from the URL. I'm using Routing in .Net 4 and the method for accessing Routing in pages does not work in a web service. In pages I just do stuff like var id = RouteData.Values["id"]; and that gets the id, but when i did it in a web service I got an error:
CS0120: An object reference is required for the non-static field,
method, or property 'System.Web.Routing.RouteData.Values.get'
Summary:
I have web service accessed form a details page where I want to get RouteData for the page making the request. I want to do this just as easily as I can on a page using RouteData.Values which is just as easy as the now the obsolete Request.Querystring.
Now I am more confused because although I could easily add a new route for the web service I don't know I would call that using jQuery Ajax because of the webservice.asmx/webmethod syntax.
Right now I have URL: "../webservices/googlemaps.asmx/GetGoogleMap" in my jQuery Ajax, but that is not a real URL. It only exists in jQuery somewhere and the way to call the service using just JavaScript is no a real URL either, its webservice.webmethod() which in this case would be googlemaps.GetGoogleMap().
I will try registering a route for webservices/googlemaps.asmx/GetGoogleMap/postid, but I doubt it will work because GetGoogleMap is not a directory or a querystring.
Get current http request and use RequestContext property to get request context - it has current routing data. For example,
var id = HttpContext.Current.Request.RequestContext.RouteData.Values["id"];
In case of WCF based web service, make sure that service is participating in ASP.NET pipeline (see ASP.NET Compatibility)
EDIT: Sorry for misleading answer - the above will not work unless web service url is registered in routing engine. However, it may not solve your issue of retrieving the id - what kind of service implementation are you using? Are you making a GET request or POST request? Typically, web service handler (asmx) or WCF pipeline should convert GET/POST parameters to method parameters. Post your web service code and how you invoke it.
I'm writing a silverlight application that resembles a shopping cart system.
This app can only be launched from the asp.net website after the user is logged in to the site.
Upon first load, the app will send a request to the backend through WCF service to retreive all the existing items in the shopping cart.
Therefore the silverlight app needs to know who the current user is, to find which shopping cart to load.
I found there are a couple of ways so far, but not happy with any of them:
using wcf aspnet compat. silverlight can ask who the current user is by asking the wcf service.
pass parameters from the page to xaml by using xaml.InitParameters and pass in the minimum amount of information to identify a user in a serialized format.
pass parameters through query string to xaml (apparently this is also possible)
Can anyone share the best practice to achieve this?
Thanks
We use the first solution in our projects. You haven't to invent any type of serialization format or so in this case. A disadvantage of this approach - extra async logic at startup.
The example of service:
[AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Required)]
public class UserInfoService : IUserInfoService
{
public UserInfo GetUserInfo()
{
if (HttpContext.Current.User.Identity.IsAuthenticated)
return null;
var userInfo = new UserInfo
{
Login = HttpContext.Current.User.Identity.Name,
Fullname = ...,
};
return userInfo;
}
}
Sending userid via initParams or query string is not good idea I think. Such things should be more hidden.
The real important thing is to verify user on server on each service call because anyone can call your services in similar way as your app.
HTH