Could not load type RestSharp.RestClientOption from assembly RestSharp

[esatis]

Hi, 

I am submitting app to Autodesk App store and using RestSharp to check for User Entitlement (as suggested by Autodesk). Everything works fine on my PC but when Autodesk creates installer and I launch the addin from Revit it throws an error:
Revit encountered a Could not load type
'RestSharp.RestClientOptions' from assembly 'RestSharp,
Version: 106.12.00, Culture: neutral,
PublicKeyToken=598062e77ß15f75'.

Any ideas why this is happening? 

Do I have to pack RestSharp.dll together with my addin.dll ?

Could not find any information on the web.. 

[jeremy_tammik · Accepted solution]

First of all, check whether Revit.exe has already loaded RestSharp on its own. If it has, you can reuse the same version as Revit uses. In that case, you do not need to load your own version. The error message may be caused because you are trying to load a different version, and it clashes with the Revit one.

[esatis]

Hi,

I just found, that Revit installation contains the same RestSharp.dll version that I use: 

106.12.0.0

So I need to uninstall my RestSharp reference from VS project and use this one?

[jeremy_tammik]

No. Keep your reference, and ensure that the Copy Local flag is set to False in its properties.

[esatis]

Thank you @jeremy_tammik !
The issue was that I used newer version of RestSharp - 108.5.0.0
Had to rewrite the options part. Now it works on my PC as before, hopefully the Autodesk installer version will also work!

[ricaun]

Is a simple REST API so you could use System.Net.WebClient and DownloadString to make the request.

public string GetString(string address)
{
    using (var client = new System.Net.WebClient())
    {
        return client.DownloadString(address);
    }
}

And use the Newtonsoft.Json that is already included in Revit.

I have created a simple implementation class AppEntitlement and a Command to test.

[Transaction(TransactionMode.Manual)]
public class CommandAppEntitlement : IExternalCommand
{
    public Result Execute(ExternalCommandData commandData, ref string message, ElementSet elementSet)
    {
        UIApplication uiapp = commandData.Application;

        var appid = "86934581652450005802";
        var userid = uiapp.Application.LoginUserId;
        var userEntitlement = new AppEntitlement(appid);

        var response = userEntitlement.GetEntitlement(userid);
        if (response != null)
        {
            var text = "AppId: " + response.AppId + "\n";
            text += "UserId: " + response.UserId + "\n";
            text += "IsValid: " + response.IsValid + "\n";
            text += "Message: " + response.Message;

            TaskDialog.Show("AppEntitlement", text);
        }

        return Result.Succeeded;
    }
}

Here is the full AppEntitlement class: https://gist.github.com/ricaun/e86e63c42bd1a5add1f8d08d6fa84aff

[esatis]

Hi,
nice solution, but it seems to have similar problem to using RestSharp.
Different Revit versions use different Newtonsoft.Json versions.
I found out the hard way, that RestSharp versions shipped with Revit change even between Revit updates in same year.
For example- Revit 2021.1.70.21 uses different RestSharp version than Revit 2021.1.109 ....

Can this happen to Newtonsoft.Json ?

[ahmed.elhawary73]

I tried your code it works well but it seems that it is not checking for internet connection or even for user login for autodesk or he bought the add-in or not please advice?