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我是C＃和MVC的新手，我正在創建猜謎遊戲以學習創建MVC產品所需的技能。我有視圖，我可以提交猜測我的控制器沒有問題。我希望現在看到用戶提交的所有以前的猜測，但無法弄清楚問題所在。從視圖訪問控制器方法
筆者認爲：
@model Prigmore2013_01.Models.GuessingGame
@{
ViewBag.Title = "Index";
}
<h2>Index</h2>
<h2>Guessing Game</h2>
<p>Insert your 3 guesses into the textboxes below</p>
<form action="Exercise09/GuessTheDigits" method="post">
<label for="guesses">Guess 1: @Html.TextBoxFor(x => x.Guesses[0], new { style = "width:12px", MaxLength = "1" }) Guess 2: @Html.TextBoxFor(x => x.Guesses[1], new { style = "width:12px", MaxLength = "1" }) Guess 3: @Html.TextBoxFor(x => x.Guesses[2], new { style = "width:12px", MaxLength = "1" })</label>
<br />
<label for="pastGuesses">Your Previous Guesses</label>
<!-- Need to loop guesses -->
<!-- End looping guesses -->
<br />
<button type="submit" name="Submit">Submit</button>
</form>
<form action="Exercise09/StartNewGame" method="post">
<button type="submit" name="Submit">New Game</button>
</form>
我的控制器：
using Prigmore2013_01.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
namespace Prigmore2013_01.Tests
{
public class Exercise09Controller : Controller
{
//
// GET: /Exercise09/
public ActionResult Index()
{
return View();
}
public ViewResult ShowPreviousGuesses()
{
if (HttpContext.Session["GameState"] == null)
{
HttpContext.Session["GameState"] = new GuessingGame();
}
GuessingGame theGame = this.Session["GameState"] as GuessingGame;
return View("Index", theGame.Guesses);
}
public ViewResult ShowGuessesMade()
{
return View();
}
public ActionResult GuessTheDigits(List<int> guesses)
{
if (HttpContext.Session["GameState"] == null)
{
HttpContext.Session["GameState"] = new GuessingGame();
}
GuessingGame theGame = this.Session["GameState"] as GuessingGame;
theGame.GuessTheHiddenDigits(guesses);
return RedirectToAction("Index", theGame.Guesses);
}
public RedirectToRouteResult StartNewGame()
{
GuessingGame newTarget = this.Session["GameState"] as GuessingGame;
newTarget.Target.Clear();
var rand = new Random();
for (int i = 0; i < 3; i++)
{
if(!newTarget.Target.Contains(rand.Next(1, 10)))
{
newTarget.Target.Add(rand.Next(1, 10));
}
}
return RedirectToRoute(new
{
controller = "Exercise09",
action = "Index"
});
}
}
}
我的模型：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
namespace Prigmore2013_01.Models
{
public class GuessingGame
{
private Random _random;
public GuessingGame()
{
this._random = new Random();
this.Guesses = new List<Guess>();
this.Target = new List<int>(){ 1, 2, 3 };
}
public List<int> Target { get; set; }
public List<Guess> Guesses { get; set; }
public List<Guess> ShowGuessesMade()
{
return Guesses;
}
public void NewGame()
{
this.Target.Clear();
var count = 4;
for (var i = 1; i < count; i++)
{
var swap = _random.Next(1, 9);
if (!this.Target.Contains(swap))
{
this.Target.Add(swap);
}
}
}
public void GuessTheHiddenDigits(List<int> guesses)
{
Guess g = new Guess() { Digits = guesses };
//compare the lists
var list = this.Target;
var list2 = g.Digits;
for (int i = 0; i < list.Count; i++)
{
if (list[i] == list2[i])
{
g.RightDigitRightPosition++;
}
}
//Now calculate how many digits in guesses are just plain wrong
List<int> result = g.Digits.Except(this.Target).ToList();
g.RightDigitWrongPosition = g.Digits.Count - result.Count - g.RightDigitRightPosition;
//handle duplicates
if (list.Count != list2.Distinct().Count())
{
// set thet right digit wrong position
for (int i = 0; i < list2.Distinct().Count(); i++)
{
g.RightDigitWrongPosition = i;
}
}
this.Guesses.Add(g);
}
}
}
以前嘗試：
以前我試過以下; foreach和for循環： 下列不循環，並導致運行時錯誤，說Object reference not set to an instance of an object.
@if(Model.Guesses != null)
{
foreach(var item in Model.Guesses)
{
Html.DisplayFor(x => x.Guesses.Count());
}
}
當我嘗試下一個for loop的var i = 0導致一個錯誤，說Object reference not set to an instance of an object.
for(var i = 0; i < Model.Guesses.Count(); i++)
{
Html.DisplayFor(x => x.Guesses.Count())
}
怎麼會我能夠查看用戶通過在我的視圖中顯示以前的猜測嗎？