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Dynamics 365 Community / Forums / Microsoft Dynamics CRM (Archived) / Web API Helper Code
Microsoft Dynamics CRM (Archived)

Web API Helper Code

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Posted on by sdnd2000 2,512

Hi, I am trying to connect dynamics 365 on premise with the official helper code in asp.net web api project. however, it stopped in the authentication part without error message, I tried the same code in console program project, and it worked fine. did I miss some configurations? I attached the code snippet where it stops in the authentication.cs. Please advise

  AuthenticationParameters ap = AuthenticationParameters.CreateFromResourceUrlAsync(
                    new Uri(serviceUrl + "api/data/")).Result;

                return ap.Authority;


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  • Suggested answer
    gdas Profile Picture
    gdas 50,091 Moderator on at

    Hi ,

    Which version of Dynamics CRM you are using , go to settings --> Customization --> Developer Resource -> Check the API URL.

    Might be you are not providing correct URL. Check here for more information -

    https://community.dynamics.com/crm/b/develop1/archive/2017/12/21/oauth-server-to-server-application-user-authentication

    Try to write like below -

      AuthenticationParameters ap = AuthenticationParameters.CreateFromResourceUrlAsync(
                    new Uri(serviceUrl + "/api/data/v8.2/")).Result;

                return ap.Authority;


  • sdnd2000 Profile Picture
    sdnd2000 2,512 on at

    I am using dynamics 365 v8.2, I tried append"/v8.2/"  to the end, but still can not go through.

  • Suggested answer
    gdas Profile Picture
    gdas 50,091 Moderator on at

    Hi ,

    Did you added another "/" at the beginning ?

  • sdnd2000 Profile Picture
    sdnd2000 2,512 on at

    that is the same code in the console program, but it works in console program

  • Verified answer
    Arun Vinoth Profile Picture
    Arun Vinoth 11,615 Moderator on at

    This blog post may be helpful to configure & solve such issues.

    www.inogic.com/.../programming-using-webapi-through-c-in-dynamics-crm-2016

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