InvalidProgramException：无效的IL代码（postgres db和unity）

早上好，我试着用我的团队应用程序阅读postgres数据库 . 但是当用户尝试输入他的登录时，会发生以下错误;

InvalidProgramException：Npgsql.NpgsqlCommand中的IL代码无效：get_Parameters（）：IL_0000：ret（包装器remoting-invoke-with-check）Npgsql.NpgsqlCommand：get_Parameters（）PersonManager.SelectPerson（System.String role，System.String email）（在Assets / Scripts / PersonManager.cs：23）Customer.SignIn（UnityEngine.GameObject obj）（在Assets / Scripts / Customer.cs：25）UnityEngine.Events.InvokableCall1 [UnityEngine.GameObject] .Invoke（System.Object [] args）（at /Users/builduser/buildslave/unity/build/Runtime/Export/UnityEvent.cs:188)UnityEngine.Events.CachedInvokableCall1 [UnityEngine.GameObject] .Invoke（System.Object [] args）（at / Users / builduser / buildslave / unity / build / Runtime / Export / UnityEvent.cs：306）UnityEngine.Events.InvokableCallList.Invoke（System.Object []参数）（在/ Users / builduser / buildslave / unity / build / Runtime / Export / UnityEvent.cs：634）UnityEngine.Events.UnityEventBase.Invoke（System.Object []参数）（在/Users/builduser/buildslave/unity/build/Runtime/Export/UnityEvent.cs:769） UnityEngine.Events.UnityEvent.Invoke（）（在/Users/builduser/buildslave/unity/build/Runtime/Export/UnityEvent_0.cs:53）UnityEngine.UI.Button.Press（）（在/ Users / builduser / buildslave / unity / build / Extensions / guisystem / UnityEngine.UI / UI / Core / Button.cs：35）UnityEngine.UI.Button.OnPointerClick（UnityEngine.EventSystems.PointerEventData eventData）（at / Users / builduser / buildslave / unity / build /扩展/ guisystem / UnityEngine.UI / UI / Core / Button.cs：44）UnityEngine.EventSystems.ExecuteEvents.Execute（IPointerClickHandler handler，UnityEngine.EventSystems.BaseEventData eventData）（在/ Users / builduser / buildslave / unity / build / Extensions） /guisystem/UnityEngine.UI/EventSystem/ExecuteEvents.cs:52）UnityEngine.EventSystems.ExecuteEvents.Execute [IPointerClickHandler]（UnityEngine.GameObject target，UnityEngine.EventSystems.BaseEventData eventData，UnityEngine.EventSystems.EventFunction`1 functor）（at /用户/ builduser / buildslave /单位/编译/扩展/ guisystem / UnityEngine.UI /的EventSystem / ExecuteEvents.cs：269 UnityEngine.EventSystems.EventSystem：Update（）

我不认为这个问题来自我的c＃代码，因为当我从我的终端尝试不同的方法时，它的确有效！意思是代码工作得很好，没有统一 . 因此，当我按下登录按钮时，它会调用以下方法：

public void SignIn(GameObject obj)
    {
        company = new Company ("localhost", "kitbox", "bluebeel");
        Person person = company.PersonManager.SelectPerson("customer", obj.GetComponent<InputField> ().text);
        if (person != null)
        {
            StateManager.Instance.person = person;
            ScenesManager.OnChanges ("Intro");
        }
        else
        {
            GameObject.Find ("SignInEmailErrorPanel").GetComponent<Image> ().color = new Color(227, 78, 103, 1);
        }
    }

如您所见，它只从另一个类调用一个方法，所以这就是代码;

public class Company{

    [...]

    private NpgsqlConnection Init(string host, string db, string user)
    {
        string connectionString;
        connectionString = "Host=" + host + ";" + "Database=" +
            db + ";" + "Username=" + user + ";";

        NpgsqlConnection conn = new NpgsqlConnection (connectionString);

        return conn;
    }

    public Company(string host, string db, string user)
    {
        try
        {
            this.connection = Init(host, db, user);
        }
        catch (Exception e)
        {
            throw e;
        }
        this.personManager = new PersonManager(this.connection);
    }
[...]
}

public class PersonManager {

    private NpgsqlConnection connection;
    private NpgsqlCommand command;

        public PersonManager(NpgsqlConnection conn)
        {
            this.connection = conn;
        }

        public Person SelectPerson(string role, string email)
        {
            Person person = null;
            string select = SelectRole(role);
            this.connection.Open();
            this.command = new NpgsqlCommand(select, this.connection);
            this.command.Parameters.Add(new NpgsqlParameter("email", NpgsqlDbType.Varchar)).Value = email;

            NpgsqlDataReader reader = this.command.ExecuteReader();
            while (reader.Read())
            {
                person = new Person(role, (string)reader["name"], (string)reader["address"], (string)reader["phone"], (string)reader["email"], (string)reader["password"]);
                person.Id = (int)reader["id"];
            }
            reader.Close();
            this.connection.Close();

            return person;

        }
}

在项目文件夹中，我在Assets中有一个“plugin”文件夹，其中包含Unity在开始时加载的Npgsql.dll和System.Data.dll .

所以我被卡住了，并不知道问题出在哪里 . 提前感谢您的未来答案