结构调整，便于后续扩展

AIStudio.Wpf.BaseDiagram/ApplicationServicesProvider.cs

@@ -0,0 +1,82 @@
+using AIStudio.Wpf.BaseDiagram.Services;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace AIStudio.Wpf.BaseDiagram
+{
+    /// <summary>
+    /// Simple service interface
+    /// </summary>
+    public interface IServiceProvider
+    {
+        IUIVisualizerService VisualizerService { get; }
+        IMessageBoxService MessageBoxService { get; }
+        //IDatabaseAccessService DatabaseAccessService { get; }
+    }
+
+
+    /// <summary>
+    /// Simple service locator
+    /// </summary>
+    public class ServiceProvider : IServiceProvider
+    {
+        private IUIVisualizerService visualizerService = new WPFUIVisualizerService();
+        private IMessageBoxService messageBoxService = new WPFMessageBoxService();
+        //private IDatabaseAccessService databaseAccessService = new DatabaseAccessService();
+
+        public IUIVisualizerService VisualizerService
+        {
+            get { return visualizerService; }
+        }
+
+        public IMessageBoxService MessageBoxService
+        {
+            get { return messageBoxService; }
+        }
+
+        //public IDatabaseAccessService DatabaseAccessService
+        //{
+        //    get { return databaseAccessService; }
+        //}
+
+    }
+
+
+
+    /// <summary>
+    /// Simple service locator helper
+    /// </summary>
+    public class ApplicationServicesProvider
+    {
+        private static Lazy<ApplicationServicesProvider> instance = new Lazy<ApplicationServicesProvider>(() => new ApplicationServicesProvider());
+        private IServiceProvider serviceProvider = new ServiceProvider();
+
+        private ApplicationServicesProvider()
+        {
+
+        }
+
+        static ApplicationServicesProvider()
+        {
+
+        }
+
+        public void SetNewServiceProvider(IServiceProvider provider)
+        {
+            serviceProvider = provider;
+        }
+
+        public IServiceProvider Provider
+        {
+            get { return serviceProvider; }
+        }
+
+        public static ApplicationServicesProvider Instance
+        {
+            get { return instance.Value; }
+        }
+    }
+}