不安装Oracle客户端，连接Oracle服务器

不安装Oracle客户端，那么需要下载oracle instant client包，就可以连接Oracle服务器；

https://www.oracle.com/database/technologies/instant-client/downloads.html

64位的解压到

Application.StartupPath + @"\Oracle64"

32位的解压到

Application.StartupPath + @"\Oracle"

在代码配置进程的环境变量，就可以了。

private void InitOracleEnvironment()
{
    string oraclePath = "";
    if (IntPtr.Size == 8)
    {
        oraclePath = Application.StartupPath + @"\Oracle64";
    }
    else if (IntPtr.Size == 4)
    {
        oraclePath = Application.StartupPath + @"\Oracle";
    }
    Environment.SetEnvironmentVariable("PATH", oraclePath, EnvironmentVariableTarget.Process);
    Environment.SetEnvironmentVariable("NLS_LANG", "SIMPLIFIED CHINESE_CHINA.ZHS16GBK", EnvironmentVariableTarget.Process);
}