添加项目文件。

Data/DbContext.cs

@@ -0,0 +1,25 @@
+using SqlSugar;
+
+namespace PMSWPF.Data
+{
+    internal class DbContext
+    {
+        private static SqlSugarClient _db;
+
+        public static SqlSugarClient GetInstance()
+        {
+            if (_db == null)
+            {
+                string connectionString = "server=127.0.0.1;port=3306;user=root;password=Pgw15221236646; database=PMS;";
+                _db = new SqlSugarClient(new ConnectionConfig()
+                {
+                    ConnectionString = connectionString,
+                    DbType = DbType.MySql, // 根据实际数据库类型修改，如DbType.MySql等
+                    IsAutoCloseConnection = true,
+                    InitKeyType = InitKeyType.Attribute
+                });
+            }
+            return _db;
+        }
+    }
+}