Index of List<> element

I load a :
Liste<login> Logins;

I d'like to match username Gui.textfield and password Gui.passwordfield saved in this list.

Login class contain :
_username and _pasword.

I try Indexof, but i get an :
Assets/Script/Login.cs(60,50): error CS1660: Cannot convert `lambda expression' to non-delegate type `User'

 

Mind posting the relevant lines of your script?

 

using UnityEngine;
using UnityEngine.UI;
using System;
using System.IO;
using System.Collections;
using System.Collections.Generic;

public class Login : MonoBehaviour {

public List<User> _users;

void Start(){
_users = new List<User> ();
LoadUsersLog();
}

void LoginWindow(int id){
GUI.Label (new Rect (150,100, 100, 20), "User Name");
currentuser = GUI.TextField (new Rect (150, 140, 100, 20),currentuser);

GUI.Label (new Rect (150,140, 100, 20), "Password");
currentpwd = GUI.PasswordField (new Rect (250,140, 150, 20),currentpwd,"*"[0]);

if (Wpwd==false)
GUI.Label (new Rect (310,180, 100, 20), "");
else
GUI.Label (new Rect (310,180, 100, 20), "Wrong password");
if (GUI.Button (new Rect (300, 220, 100, 40), "OK")) {
PwdIndex=_users.IndexOf( d=>d == currentuser);
if (currentpwd == _users[PwdIndex]._UserPwd){
IsLogedIn = true;
UserLogged= _users[PwdIndex]._UserName;
}else{
Wpwd=true;
}
}

 

Why are you using a lambda expression here? It should read

Code (csharp):

1. PwdIndex=_users.IndexOf(currentuser);

 

lambda expression have solved a previous problem when selecting user in a list (that give me index when clicking on item).
But now, for personal data security, i need to avoid using selecting in a list displayed on screen.
So i need to find index corresponding to username and then compare the current password with password registered

Assets/Script/Login.cs(60,41): error CS1502: The best overloaded method match for `System.Collections.Generic.List<User>.IndexOf(User)' has some invalid arguments