App.xaml.cs

#region Copyright Syncfusion Inc. 2001-2021.
// Copyright Syncfusion Inc. 2001-2021. All rights reserved.
// Use of this code is subject to the terms of our license.
// A copy of the current license can be obtained at any time by e-mailing
// licensing@syncfusion.com. Any infringement will be prosecuted under
// applicable laws. 
#endregion
using syncfusion.demoscommon.wpf;
using System.Reflection;
using System.Windows;
using Syncfusion.Licensing;
using System.IO;
using System.Text;

namespace syncfusion.spellcheckerdemo.wpf
{
    /// <summary>
    /// Interaction logic for App.xaml
    /// </summary>
    public partial class App : Application
    {
        public App()
        {
            SyncfusionLicenseProvider.RegisterLicense(DemoCommon.FindLicenseKey());
        }
        protected override void OnStartup(StartupEventArgs e)
        {
            var window = new MainWindow(new SpellCheckerDemoViewModel());
            window.Show();
            base.OnStartup(e);
        }
    }

    public static class DemoCommon
    {
        /// <summary>
        /// Helper method to find a syncfusion license key from the Common folder
        /// </summary>
        /// <param name="fileName">File name of the syncfusion license key</param>
        /// <returns></returns>
        public static string FindLicenseKey()
        {
            int levelsToCheck = 12;
            string filePath = @"..\SyncfusionLicense.txt";

            string rootPath = System.IO.Path.GetDirectoryName(Assembly.GetEntryAssembly().CodeBase.Replace(@"file:///", ""));

            for (int n = 0; n < levelsToCheck; n++)
            {
                string fileDataPath = System.IO.Path.Combine(rootPath, filePath);
                if (System.IO.File.Exists(fileDataPath))
                    return File.ReadAllText(fileDataPath, Encoding.UTF8);
                DirectoryInfo rootDirectory = Directory.GetParent(rootPath);
                if (rootDirectory == null)
                    break;
                rootPath = rootDirectory.FullName;
            }
            return string.Empty;
        }
    }
}