SharePoint App Manager

SPAppManager.cs

using System;
using System.Linq;
using Microsoft.SharePoint.Client;

namespace SharePoint.Client.Provisioning 
{
    public class SPAppManager
    {
        /// <summary>
        /// Deploy SP App 
        /// </summary>
        /// <param name="context">Client context</param>
        /// <param name="appFullPath">Full path to app file (.app)</param>
        /// <returns></returns>
        public static AppInstance Deploy(ClientContext context, string appFullPath)
        {
            EnsureDeveloperFeature(context);
            using (var packageStream = System.IO.File.OpenRead(appFullPath))
            {
                var appInstance = context.Web.LoadAndInstallApp(packageStream);
                context.Load(appInstance);
                context.ExecuteQuery();
                return appInstance;
            }
        }


        /// <summary>
        /// Ensure Developer Feature 
        /// </summary>
        /// <param name="ctx"></param>
        private static void EnsureDeveloperFeature(ClientContext ctx)
        {
            var result = ctx.LoadQuery(ctx.Site.Features.Where(f => f.DefinitionId == DeveloperFeatureId));
            ctx.ExecuteQuery();
            if (result.Any()) return;
            var feature = ctx.Site.Features.Add(DeveloperFeatureId,true, FeatureDefinitionScope.None);
            ctx.ExecuteQuery();
        }


        private static readonly Guid DeveloperFeatureId = new Guid("e374875e-06b6-11e0-b0fa-57f5dfd72085");
    }
}