3rdpartylibs/fastreports.wpf/EndUserDesigner.WPF/App.xaml.cs

using FastReport;
using FastReport.Utils;
using System.Windows;

namespace Designer
{
    public partial class App : Application
    {
        private void Application_Startup(object sender, StartupEventArgs e)
        {
            this.ShutdownMode = ShutdownMode.OnExplicitShutdown;
            Config.DesignerSettings.ShowInTaskbar = true;
            Config.DesignerSettings.EmbeddedPreview = true;
            Config.ReportSettings.ShowPerformance = true;

#if NETCOREAPP
            // RoslynPad as a code editor (available in net6.0-windows target)
            FastReport.WPF.RoslynPad.SyntaxEditor.Register();
#endif

            using (var report = new Report())
            {
                string fileName = "";
                bool preview = false;
                
                foreach (var arg in e.Args)
                {
                    if (arg.IndexOf("/preview") != -1)
                    {
                        preview = true;
                    }
                    else if (arg.IndexOf("/savepath=") != -1)
                    {
                        int i = arg.IndexOf('=');
                        string path = arg.Substring(i + 1).Trim('"');
                        Config.SaveFolder = path;
                    }
                    else
                    {
                        fileName = arg;
                    }
                }

                if (!string.IsNullOrEmpty(fileName))
                    report.Load(fileName);

                if (preview)
                {
                    //report.Prepare();
                    //report.ShowPrepared();
                    report.ShowAsync();
                }
                else
                {
                    report.Design();
                }
            }

            this.Shutdown();
        }
    }
}