从asp.net MVC中的函数返回对象的问题

Question

i am little confused about my code:

Here is some function from my controller:

  public void signIn(string userName, string userPass)
        {
            User user = new User();
            user.getUser(userName , userPass);

            if (user.userName != null)
            {
                Response.Redirect("/Home/Menu");
            }
            else
            {
                Response.Redirect("/Index/Index?Fail=" + "fail");
            }
        }

the " user.getUser" suppose to return a User object.. here is the code from my Model directory:

public class User
{
    public ObjectId _id { get; set; }
    public string userName { get; set; }
    public string userPass { get; set; }

    public User getUser(string name , string pass)
    {
        var client = new MongoClient("mongodb://localhost:27017");
        var db = client.GetDatabase("testdb");
        var coll = db.GetCollection<User>("user");

        List<User> list = coll.Find(x => x.userName == name && x.userPass == pass).ToList<User>();


        User uObj = new User();
        uObj = list.FirstOrDefault();

        return uObj;
    }
}

when i am debugging the code i can see the uJob object contain values. but when the function end and i return to the controller i see that the user object contain only null values, and the condition - " if (user.userName != null)" is returning FALSE!.. instead of TRUE..

i would like to get some help. Thanks !

Answer 1

您必须分配它。

 user = user.getUser(userName , userPass);

Answer 2

Either you assign the value returned by the getUser method in calling program like this

user = user.getUser(userName , userPass);

Or you change the code in Model like this

public class User
{
    public ObjectId _id { get; set; }
    public string userName { get; set; }
    public string userPass { get; set; }

    public void getUser(string name , string pass)
    {
        var client = new MongoClient("mongodb://localhost:27017");
        var db = client.GetDatabase("testdb");
        var coll = db.GetCollection<User>("user");

        var user = coll.FirstOrDefault(x => x.userName == name && x.userPass == pass);

        if(user != null)
        {
            this._id = user._id;
            this.userName = user.userName;
            this.userPass = user.userPass;
        }
    }
}

Answer 3

if you replace

if (user.userName != null)

with

if ( user.getUser(userName , userPass).userName != null)      

wil works for you.