welcome to XRM blog

Keep in touch with latest CRM/ERP articles

To remain competitive your organisation must be efficient across the business process spectrum. To do so you need to take sound decisions based on a balance between the cost and risk. To do so you will be heavily dependent on your content management in itself needs...


Web API Attribute Routing

By Sudeep on 1/26/2016


In my previous post here I had discussed about convention based routing which is the default way in Web API. Check it out here.Starting with Web API 2 Microsoft introduced attribute based routing. Which is way more simpler. The reason for introducing this new feature was two folds, one it is easier to understand and maintain, second is the kind of REST calls required.

Let me elucidate it with an example

GET /profile/20011/ContactNumber

GET /profile/2011/EmailAddress

Not to say that this cannot be achieved by traditional methods but it is much harder to understand.

So Microsoft came up with Attribute Routing.

Let us take an example

So for our first example let us assume that you want the route to read some thing like this


In this case we use a prefix called [Route(“Employee”)] before the action needed.

Parameter’s in End Point


Pretty simple isn’t it? Now let’s say you want the endpoint to be something like this, where 1 is the Id of the Employee, for whom you need the profile.


Using Route Prefix this becomes pretty simple

Now let it take a step further and this time we need all the orders for a particular employee with id 501


As you can see each parameter is written with curly braces and the function names the parameter exactly the same.

So does that mean we can use only a single parameter? No!

Let’s take another example, I want the order no 345 for the Employee profile with id of 56


Parameter Type

If we want to pass some parameter which has a type different from number, can we do it? Yes sure, let me modify the earlier example and get the profile based on name instead of id(not a good idea). Assumption is that name will always be unique and never repeated


As you can see I have decorated the parameter with the type. It looks fine but there is slight issue with this type, it only accepts alphabets and will fail if you pass a blank space. Please find the table below as a guide for your reference.

It is pretty much impossible to discuss all the options in one article but you can find it out by yourself how to use all of them.


Till now we have concentrated on defining the Rest end point based on the action. In our simple scenario it is pretty easy but in real world this is seldom the case. Your project will have multiple controllers and most probably some of them will have over lapping action names, even after you changing the route string.

In such a case we can put the RoutePrefix on top of our class/controller. Continuing from the earlier example let us assume we need the controller name to be part of the Rest endpoint. (Master is the name given to our class)


HTTP Methods

All the examples shown till now have been simple Get request but WebAPI2 is not restricted to only one verb. Following verbs are available to  you for your usage.

·        [HttpDelete]

·        [HttpGet]

·        [HttpHead]

·        [HttpOptions]

·        [HttpPatch]

·        [HttpPost]

·        [HttpPut]

Let’s assume that you are not following the conventions and the action name does not contain the Http verb, so how do you make Web API understand the verb you are using. Simple!

As you can see I have adorned the top of the action with the verb [HttpPost], this will make the Web API understand this is not a get request but a post request.

I hope I have made a few points clear to you and made the confusing routing a little easy, in my next article I will post a simple JavaScript code to call these webapi’s .


Blog Calendar
Blog Calendar List
2019 Jan  14  3
2018 Dec  16  4
2018 Nov  56  3
2018 Oct  12  3
2018 Sep  35  11
2018 Aug  3  2
2018 Jun  11  1
2018 Jan  45  2
2017 Sep  394  5
2017 Aug  15  1
2017 Jul  15  2
2017 Jun  40  2
2017 May  17  1
2017 Apr  31  2
2017 Mar  107  4
2017 Feb  290  4
2016 Dec  174  3
2016 Nov  283  8
2016 Oct  203  10
2016 Sep  349  6
2016 Aug  38  1
2016 Jun  1623  6
2016 May  103  3
2016 Jan  68  2
2015 Dec  380  6
2015 Nov  3  1
2015 Oct  12  1
2015 Sep  1174  6
2015 Aug  11  1
2015 Jul  107  2
2015 Jun  8  1
2015 May  20  1
2015 Apr  21  2
2015 Mar  69  3
2015 Jan  5056  4
2014 Dec  15  1
2014 Nov  2175  4
2014 Oct  75  2
2014 Sep  96  2
2014 Aug  2997  1
2014 Jul  40  2
2014 Apr  2422  12
2014 Mar  270  19
2014 Feb  219  8
2014 Jan  1510  16
2013 Dec  21  2
2013 Nov  610  2
2013 Oct  244  3
2013 Sep  10  1
2013 Aug  29  3
2013 Jul  202  1
2013 Apr  44  6
2013 Mar  1683  10
2013 Feb  280  4
2013 Jan  252  2
2012 Nov  26  2
2012 Oct  403  10
Tag Cloud
Interested in our services? Still not sure about project details? get a quote