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ManagementApp/AServices/Microsoft365Service.cs

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+using ManagementApp.AServices.Microsoft365;
+using ManagementApp.AServices.ThreadManage;
+using Microsoft.Identity.Web;
+using System.Collections.Concurrent;
+
+namespace ManagementApp.AServices
+{
+    public class Microsoft365Service : BackgroundService, IDisposable
+    {
+        
+        private readonly IConcurrentTasks _task;
+        public Microsoft365Service(IConcurrentTasks tasks) {
+            _task = tasks;
+        }
+
+
+        protected override async Task ExecuteAsync(CancellationToken stoppingToken)
+        {
+            await DoWork(stoppingToken);
+        }
+
+        private async Task DoWork(CancellationToken stoppingToken)
+        {
+            while (!stoppingToken.IsCancellationRequested)
+            {
+                var workItem = await _task.First(stoppingToken);
+               
+                try
+                {
+                    await workItem(stoppingToken);
+                }
+                catch (Exception ex)
+                {
+                    
+                }
+            }
+        }
+
+        public override async Task StopAsync(CancellationToken stoppingToken)
+        {
+            await base.StopAsync(stoppingToken);
+        }
+
+        public override void Dispose()
+        {
+            throw new NotImplementedException();
+        }
+    }
+}