来自同一实例的字段保留值

事实上,它似乎不是这样工作的,每个线程似乎都保留了自己的值,线程一仍然具有db1值,线程二仍然具有db2值。这怎么可能?当我理解来自同一个类的不同实例的字段共享相同的值时,我错了吗?

感谢您的友好和熟练的解释

奥利弗

public class Context
{
    public string host; 
    public string port;
    public string user;
    public string pwd;
    public string dbname;
...
public Context(string db) {// Each thread is launched with a different database name
        try { 
        var rep = string.Format(@"D:\Bd\{0}\params\config.txt",db); // one file for each thread
        if (File.Exists(rep)) {
            var dic = File.ReadAllLines(rep)
              .Select(l => l.Split(new[] { '=' }))
              .ToDictionary(s => s[0].Trim(), s => s[1].Trim());
            host = dic["host"];
            port = dic["port"];
            user = dic["user"];
            pwd = dic["pwd"];
            dbname = db;
...
Thread thThd1 = new Thread(startthd1);
thThd1.Start();

public static void startthd1() {
   Context ncontext = new Context("db1");
   Chkthd gth = new Chk(ncontext);
    }

Thread thThd2 = new Thread(startthd2);
thThd2.Start();

public static void startthd2() {
   Context ncontext = new Context("db2");
   Chkthd gth = new Chk(ncontext);
    }