ArcGIS .Net SDK publish shapefile to ArcGIS Online

Apparently is not that hard to do.

ESRI provided another guide documents for .Net SDK here

Following their tutorial simply shp import will look as follow:

    public async Task PublishShp()
    {
        // All shp files needs to be pack into ZIP
        const string filePath = "C://test.zip";
        const string portalFileName = "test";
        var organizationUri = new Uri("https://www.arcgis.com/sharing/rest/");

        // Create credential token
        var cred = await AuthenticationManager.Current.GenerateCredentialAsync(
            organizationUri,
            _userName,
            _password) as ArcGISTokenCredential;

        // connect to the portal, pass in the token 
        var portal = await ArcGISPortal.CreateAsync(
            organizationUri,
            cred,
            CancellationToken.None);

        // Create portal item object
        var item = new PortalItem(portal, PortalItemType.ShapeFile, portalFileName);

        // All shp files into be zip into single file
        var data = new FileStream(filePath, FileMode.Open);
        var mediaType = new MediaTypeHeaderValue("application/octet-stream");
        var content = new PortalItemContentParameters(data, portalFileName, mediaType);
        await portal.User.AddPortalItemAsync(item, content);
        data.Close();
    }