251029

FATrace.App/FSqlContext.cs

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+using FATrace.Com;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace FATrace.App
+{
+    public class FSqlContext
+    {
+        private static readonly Lazy<IFreeSql> LazyFreeSql = new Lazy<IFreeSql>(() =>
+        {
+            var connectionString = ConfigHelper.GetRequiredConnectionString("connecting");
+            try
+            {
+                return new FreeSql.FreeSqlBuilder()
+                    .UseConnectionString(FreeSql.DataType.SqlServer, connectionString)
+                    .UseAutoSyncStructure(true)
+                    .Build();
+            }
+            catch (Exception ex)
+            {
+                throw new InvalidOperationException("初始化数据库连接失败，请检查连接字符串与数据库网络连通性。", ex);
+            }
+        });
+
+        /// <summary>
+        /// 获取单例数据库实例。
+        /// </summary>
+        public static IFreeSql FDb => LazyFreeSql.Value;
+    }
+}