Setting class properties quickly

class UserClass{

    #region Class properties which are binding from DB
    .
    .
    .
    #endregion


    #region Constructor Methods
    public UserClass(int _iUser_id)
    {
        // of course this is wrong but how can i quickly se开发者_JAVA百科t properties 
        // which are coming from DB by extension method over context class?
        this = DAO.context.GetById<UserClass>(_iUser_id);
    }
    #endregion
}

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You need to set the properties manually.

If you really want to, you could use reflection or expression trees to loop through the properties, but it's probably not worth it.

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You could use a static method instead of a constructor:

public static UserClass GetById(int userId) {
    return DAO.context.GetById<UserClass>(userId);
}