添加项目文件。

ExportExcelTest/MdbHelper.cs

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+using System;
+using System.Data;
+using System.Data.OleDb;
+
+using Bentley.Internal.MstnPlatformNET;
+
+namespace GeologyToolkit
+{
+    internal class MdbHelper
+    {
+        /// <summary>
+        ///     构建函数
+        /// </summary>
+        /// <param name="fileName">MDB文件（含完整路徑）</param>
+        public MdbHelper(string fileName)
+        {
+            this.fileName = fileName;
+            connectionString = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + fileName;
+        }
+
+        private readonly string connectionString;
+        private readonly string fileName;
+        private OleDbConnection odcConnection;
+
+        /// <summary>
+        ///     断开连接（关闭据库文件）
+        /// </summary>
+        public void Close()
+        {
+            odcConnection.Close();
+        }
+
+        /// <summary>
+        ///     根据sql命令返回一个DataSet
+        /// </summary>
+        /// <param name="sql">sql命令</param>
+        /// <returns>以DataTable形式返回数据</returns>
+        public DataSet GetDataSet(string sql)
+        {
+            DataSet ds = new DataSet();
+
+            try
+            {
+                OleDbDataAdapter adapter = new OleDbDataAdapter(sql, odcConnection);
+                adapter.Fill(ds);
+            }
+            catch (Exception)
+            {
+                throw new Exception("sql语句： " + sql + " 执行失败！");
+            }
+
+            return ds;
+        }
+        //根据表名返回一个DataSet
+        public DataSet GetDataSetByTableName(string tableName)
+        {
+            string sql = "select * from " + tableName;
+            return GetDataSet(sql);
+        }
+        //查询所有的表名
+        public DataTable GetTables()
+        {
+            DataTable dt = odcConnection.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, new object[] { null, null, null, "TABLE" });
+            return dt;
+        }
+        public void Open12()
+        {
+            //string connStr = @"Driver={Microsoft Access Driver (*.mdb)};DBQ=" + fileName;
+            string connectionString = $"Provider=Microsoft.ACE.OLEDB.12.0;Data Source={fileName};Persist Security Info=False;";
+            using (OleDbConnection connection = new OleDbConnection(connectionString))
+            {
+                connection.Open();
+                // Your code to interact with the database
+            }
+        }
+
+        /// <summary>
+        ///     建立连接（打开数据库文件）
+        /// </summary>
+        public void Open()
+        {
+            // 建立连接
+            odcConnection = new OleDbConnection(connectionString);
+            // 打开连接
+            odcConnection.Open();
+        }
+    }
+}