最近做项目，要跟对方系统的库进行读写，结果发现对方采用的是oracle的us7ascii编码，我们系统默认采用的是ZHS16GBK，导致我们客户端读取和写入对方库的数据都是乱码，搜索网上，发现需要采用独立的oracle驱动去处理，最后采用Devart驱动，可以指定字符集编码

添加引用2个DLL：

数据库操作代码如下：（查询）

using System;
using System.Collections.Generic;
using System.Data;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Text;
using System.Xml;using Devart.Data.Oracle;namespace WindowsOrcleDevart
{/// <summary>/// 使用OracleDevart驱动/// </summary>public class ProviderDevart{private OracleConnection dbConnection;private OracleTransaction dbTransaction;private string _strConn = "";private string path = AppDomain.CurrentDomain.BaseDirectory + "logs\\调用数据库";public string Err = "";public string StrConn { get => _strConn; set => _strConn = value; }public int BeginTransaction(){//this.Err = "";int result = -1;try{GetSingerConnection();this.dbTransaction = this.dbConnection.BeginTransaction();result = 1;}catch (Exception message){this.dbTransaction.Dispose();this.dbTransaction = null;Err = "开始事务异常，" + message.Message;WriteLog(path, Err);}return result;}// 定义一个静态变量来保存类的实例private static ProviderDevart s_instance;/// <summary>/// 定义公有方法提供一个全局访问点,同时你也可以定义公有属性来提供全局访问点/// </summary>/// <returns></returns>public static ProviderDevart Instance{ // 当第一个线程运行到这里时，此时会对locker对象 "加锁"，// 当第二个线程运行该方法时，首先检测到locker对象为"加锁"状态，该线程就会挂起等待第一个线程解锁// lock语句运行完之后（即线程运行完之后）会对该对象"解锁"// 双重锁定只需要一句判断就可以了get{if (s_instance == null){lock (locker){if (s_instance == null){s_instance = new ProviderDevart();}}}return s_instance;}}#region 单例锁  定义一个标识确保线程同步private static readonly object locker = new object();#endregionprivate void GetSingerConnection(){if (this.dbConnection != null){if (dbConnection.State != ConnectionState.Open){dbConnection.Open();}}else{this.dbConnection = new OracleConnection(_strConn);this.dbConnection.Open();}}public int TransactionCommit(){//this.Err = "";int result = -1;try{GetSingerConnection();if (this.dbTransaction != null){this.dbTransaction.Commit();this.dbTransaction.Dispose();this.dbTransaction = null;}result = 1;}catch (Exception message){if (this.dbTransaction != null){this.dbTransaction.Dispose();this.dbTransaction = null;}Err = "提交事务异常，" + message.Message;WriteLog(path, Err);}return result;}public int TransactionRollBack(){//this.Err = "";int result = -1;try{GetSingerConnection();if (this.dbTransaction != null){this.dbTransaction.Rollback();this.dbTransaction.Dispose();this.dbTransaction = null;}result = 1;}catch (Exception message){if (this.dbTransaction != null){this.dbTransaction.Dispose();this.dbTransaction = null;}Err = "回滚事务异常，" + message.Message;WriteLog(path, Err);}return result;}/// <summary>/// 插入/更新/删除表数据/// </summary>/// <param name="strSql"></param>/// <returns>返回SQL执行的影响行数，返回-1表示出现了内部错误</returns>public int ExecuteNonQuery(string strSql){//this.Err = "";OracleGlobalization applicationInfo = OracleGlobalization.GetApplicationInfo();applicationInfo.ClientCharacterSet = "us7ascii";OracleGlobalization.SetApplicationInfo(applicationInfo);int result = -1;try{GetSingerConnection();WriteLog(path, " 开始");WriteLog(path, "strConn:" + _strConn);WriteLog(path, "strSql:" + strSql);if (_strConn == "" || strSql == ""){Err = "strConn 或 strSql 为空，无法执行!";}else{OracleCommand cmd = dbConnection.CreateCommand();if (this.dbTransaction != null){cmd.Transaction = this.dbTransaction;}cmd.CommandText = strSql;result = cmd.ExecuteNonQuery();}}catch (Exception ex){Err = "插入更新数据异常，" + ex.Message;WriteLog(path, Err);}WriteLog(path, " 结束");return result;}/// <summary>/// 查询表数据/// </summary>/// <param name="strSql">SQL语句</param>/// <param name="data">返回数据为DataTable</param>/// <returns></returns>public int FillDataTable(string strSql, out DataTable data){//this.Err = "";data = new DataTable();OracleGlobalization applicationInfo = OracleGlobalization.GetApplicationInfo();applicationInfo.ClientCharacterSet = "us7ascii";OracleGlobalization.SetApplicationInfo(applicationInfo);int result = -1;OracleCommand oleDbCommand = null;try{GetSingerConnection();WriteLog(path, " 开始");WriteLog(path, "strConn:" + _strConn);WriteLog(path, "strSql:" + strSql);oleDbCommand = new OracleCommand(strSql, dbConnection);oleDbCommand.CommandType = CommandType.Text;using (OracleDataAdapter oleDbDataAdapter = new OracleDataAdapter(oleDbCommand)){DataSet ds = new DataSet();oleDbDataAdapter.Fill(ds, "ReturnTable");if (ds != null && ds.Tables.Count > 0){data = ds.Tables[0];}}result = 1;}catch (Exception ex){Err = "查询数据异常，" + ex.Message;WriteLog(path, Err);}WriteLog(path, " 结束");return result;}private bool dbClose(OracleConnection conn, OracleCommand cmd, OracleTransaction tran){bool result;if (cmd != null){cmd.Dispose();GC.Collect();result = false;}else if (conn != null){if (conn.State == ConnectionState.Open){conn.Close();}conn.Dispose();GC.Collect();result = true;}else{GC.Collect();result = false;}return result;}public void WriteLog(string filePath, string message){try{if (!Directory.Exists(filePath)){Directory.CreateDirectory(filePath);}string fileName = filePath + "\\" + DateTime.Now.ToString("yyyy-MM-dd") + ".log";string msg = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss:") + DateTime.Now.Millisecond + "  " + message;System.IO.StreamWriter sw = System.IO.File.AppendText(fileName);sw.WriteLine(msg);sw.Close();}catch{}}}
}

客户端访问示例：

private void button1_Click(object sender, EventArgs e)
{ProviderDevart providerDevart = ProviderDevart.Instance;providerDevart.StrConn = "data source=XXX.XX.8.X:1521/orcl;user id=#####;password=######;";providerDevart.FillDataTable("SELECT '测试数据' as T1 FROM DUAL  ",out DataTable dt);MessageBox.Show(dt.Rows[0]["T1"].ToString());
}

源码，压缩包见地址：

c#程序，oracle使用Devart驱动解决第第三方库是us7ascii，数据乱码的问题资源-CSDN文库