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I'm playing around with EF, trying to get my bearings. Right now I'm writing a blackjack game for a website. The problem is that my whenever I pull a GameState from the database, the playerHand, dealerHand, theDeck, and dealerHidden properties are null. 

public class GameState
{
    [Key]
    [DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)]
    public int gameSession { get; set; }
    public int playerScore { get; set; }
    public int dealerScore { get; set; }
    public Deck theDeck { get; set; }
    public List<Cards> playerHand { get; set; }
    public List<Cards> dealerHand { get; set; }
    public Cards dealerHidden { get; set; }
    public bool gameOver { get; set; }
}

public class Cards
{
    [Key]
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public int cardId { get; set; }
    public string cardName { get; set; }
    public int cardValue { get; set; }
}

public class GameStateContext : DbContext
{
    public GameStateContext() : base("MyContext")
    {
    }
    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        modelBuilder.Entity<GameState>().HasRequired(e => e.theDeck);
        modelBuilder.Entity<GameState>().HasRequired(e => e.dealerHand).WithMany().WillCascadeOnDelete(false);
        modelBuilder.Entity<GameState>().HasRequired(e => e.playerHand).WithMany().WillCascadeOnDelete(false);
        modelBuilder.Entity<GameState>().HasOptional(e => e.dealerHidden);
        modelBuilder.Entity<Deck>().HasRequired(e => e.cards).WithMany().WillCascadeOnDelete(false);
        base.OnModelCreating(modelBuilder);
    }

    public DbSet<GameState> GameStates { get; set; }
    public DbSet<Deck> Decks { get; set; }
    public DbSet<Card> Cards { get; set; }
}

The cards and deck table are populated. Where am I going wrong?

How to print the contents of a two-dimensional array of characters?

I'm trying to print an array of characters in C but i can't print everything. I want to print : b1 b2 My code:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main() {
  char def[3][10];     //define a multidimensional array of characters 
  strcpy(def[0],"b1"); //insert "b1" at first line
  strcpy(def[1],"b2"); //insert "b2" at first line
  printf("%s",def);    //print everything?
}

The above code prints just b1. I already tried :

printf("%s",def[0]);
printf("%s",def[1]);

But i have error "invalid use of array with unspecified bounds"

4

1 回答 1

1

我认为您要么需要通过使它们成为虚拟属性来使导航属性（即 playerHand、dealerHand、theDeck 和dealerHidden）可延迟加载，要么您需要在查询 GameState 时急切地加载它们。

myDBContext.GameStates.Include("playerHand").Include("dealerHand").Include("theDeck").Include("dealerHidden").where(...);

这是关于实体框架如何处理相关对象的一个​​不错的解释：

http://msdn.microsoft.com/en-us/data/jj574232.aspx

于 2012-12-15T20:52:18.290 回答