Call Custom Service outside the CRM hosted website


How to call the Custom Rest/Webservice outside the CRM website in OnPremsies in CRM:

Purpose:
   Why we need to host the custom service inside the CRM rather than outside?
        Reason behind this is if we host the custom service inside the CRM,if any crashes happen in the custom service it will affect the CRM application because of same application pool.If we host outside the CRM website this wont happen.

1.Create a REST service in Visual studio2013 using Web API

2. The following links helps you to enable CORS using nuget package console

http://www.asp.net/web-api/overview/security/enabling-cross-origin-requests-in-web-api


3.Once u enable the CORS using above link,Publish the application and make sure all dll allow local copy set to  true in the properties.

4.Host the the custom service in separate website in IIS(ouside the CRM with Https enabled)

5.When ran the custom service through IIS to make sure it is working or not
the following errror occured.

Error:
Attempt by security transparent method 'System.Web.Http.GlobalConfiguration.get_Configuration()' to access security critical type 'System.Web.Http.HttpConfiguration' failed

6. The below steps would solve the problem.

Steps to Do:
  • Go to Tools->Nuget Package Manager->Package manager Console
  • Run the below command in order
Update-Package Microsoft.AspNet.WebApi -Pre
Install-Package Microsoft.AspNet.WebApi.OData -Version 5.0.0

Publish the changes and host again will solve the issue

Ref:
http://stackoverflow.com/questions/18476370/how-do-i-resolve-the-error-attempt-by-security- transparent-method-system-web-h


Today we learnt how to Call the Custom services outside the CRM website in OnPremsies in CRM



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