c# - 如何将新的 Guid 添加到字符串列表？

Question

我收到“对象引用未设置到实例...”错误。我评论这行...

        public Guid Login(string userName, string password)
        {
            Guid result = new Guid();<p></p>

<pre><code>        if (!string.IsNullOrEmpty(userName) && !string.IsNullOrEmpty(password))
        {
            userName = userName.Trim();
            password = password.Trim();

            Member member = BusinessDb.LoginDbJobs.GetUser(userName);

            if (member != null && member.PasswordDb == password)
            {
                result = Guid.NewGuid();
                Members.Live.Add(result); //--->Object reference not set to an instance of an object.
            }
        }

        return result;
    }
</code></pre>

<p></p>

成员类是；

...
    public class Members
    {
        public static List< Guid > Live;
    }
...

那么如何将“新 Guid”添加到“List Live”？

谢谢...

Answer 1

我认为你应该使用:

public class Members
{
    public static List<Guid> Live = new List<Guid>();
}

你声明了 Live 但没有初始化它，所以 Live 是空的!!