C# sample that demonstrates programmatic JSON AzureRM template export

ExportJsonARMTemplate.cs

// requires Microsoft.IdentityModel.Clients.ActiveDirectory 5.29
//          Microsoft.Azure.Management.ResourceManager 3.15.1-preview
using System;
using System.Collections.Generic;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.Azure.Management.ResourceManager;
using Microsoft.Azure.Management.ResourceManager.Models;
using Microsoft.IdentityModel.Clients.ActiveDirectory;
using Microsoft.Rest;

class CustomLoginCredentials : ServiceClientCredentials
{
    string _authnToken { get; set; }
 
    public override void InitializeServiceClient<T>(ServiceClient<T> client)
    {
        var authenticationContext = new AuthenticationContext("https://login.windows.net/YOUR_TENANT_ID");
        var credential = new ClientCredential(clientId: "YOUR_CLIENT_ID", clientSecret: "YOUR_CLIENT_SECRET");

        var result = authenticationContext.AcquireTokenAsync(resource: "https://management.core.windows.net/", clientCredential: credential).Result;

        if (result == null) throw new InvalidOperationException("Failed to obtain the JWT token");

        _authnToken = result.AccessToken;
    }
    public override async Task ProcessHttpRequestAsync(HttpRequestMessage request, CancellationToken cancellationToken)
    {
        if (request == null) throw new ArgumentNullException(nameof(request));
        if (_authnToken == null) throw new InvalidOperationException("Token provider cannot be null");

        request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", _authnToken);
        request.Headers.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

        await base.ProcessHttpRequestAsync(request, cancellationToken);
    }
}

class Program
{
    static void Main(string[] args)
    {
        var client = new ResourceManagementClient(new CustomLoginCredentials())
        {
            SubscriptionId = YOUR_SUBSCRIPTION_ID"
        };

        var result = client.ResourceGroups.ExportTemplate("YOUR_RESGROUP",
            new ExportTemplateRequest {
                Options = "SkipAllParameterization",
                Resources = new List<string> { "/subscriptions/YOUR_SUBSCRIPTION_ID/resourceGroups/YOUR_RESGROUP/providers/Microsoft.Storage/storageAccounts/datalakestg1" } });

        Console.WriteLine(result.Template);
    }
}