Question

我在理解如何通过get获取我的班级的二维数组时遇到了一些麻烦。

这是我的课程目前正在寻找的方式：

class Something
{
  private int[,] xArray;

  public Something()
  {
    xArray = new int[var1, var2];

    for (int row = 0; row < xArray.Getlength(0); row++)
      for (int col = 0; col < xArray.GetLength(1); col++)
        xArray[row, col] = someInt;
  }

  public int[,] XArray
  {
    get { return (int[,])xArray.Clone(); }
  }
}


class Main
{
  Something some;

  public void writeOut()¨
  {
    some = new Something();

    for (int row = 0; row < some.XArray.GetLength(0); row++)
      for (int col = 0; col < some.XArray.GetLength(1); col++)
        Console.Write(some.XArray[row, col].ToString());
  }
}

当我用调试器检查时，xArray在Something类中具有它应该具有的所有值，但它在Main类中没有值，它只获得数组的大小。我做错了什么？

Answer 1

C# Copy Array by Value

据我所知，数组上的克隆副本不会应用于您的元素。你必须手动完成。它建议对Clone进行扩展，并让您管理深层复制。

Answer 2

想出这个snipet并在控制台中写出一百“1”，这意味着测试人员（你的“主”）确实看到了正确的值。

完全可靠，我不知道你的问题是什么，因为我们没有看到你的整个代码。除非你发布整个解决方案，否则你必须弄清楚自己。您发布的代码按您所说的方式工作。

长话短说：我添加了运行所需的部分，不仅运行，还没有显示任何错误。您可能希望将您的代码与下面的代码进行比较。

using System;
using System.Collections.Generic;
using System.Text;

namespace ConsoleApplication1
{
class Program
{
    static void Main(string[] args)
    {
        tester.writeOut();
    }
}


class Something
{
    private int firstDimensionLenght = 10;
    private int secondDimensionLenght = 10;

    private int[,] xArray;

    public Something()
    {
        xArray = new int[firstDimensionLenght, secondDimensionLenght];

        for (int row = 0; row < xArray.GetLength(0); row++)
            for (int col = 0; col < xArray.GetLength(1); col++)
                xArray[row, col] = 1;
    }

    //Add some intellisence information stating you clone the initial array
    public int[,] XArrayCopy
    {
        get { return (int[,])xArray.Clone(); }
    }
}

class tester
{
    static Something some;

    //We dont want to initialize "some" every time, do we? This constructor
    //is called implicitly the first time you call a method or property in tester
    static tester(){
        some = new Something()
    }

    //This code is painfuly long to execute compared to what it does
    public static void writeOut()
    {
        for (int row = 0; row < some.XArrayCopy.GetLength(0); row++)
            for (int col = 0; col < some.XArrayCopy.GetLength(1); col++)
                Console.Write(some.XArrayCopy[row, col].ToString());
    }

    //This code should be much smoother
    public static void wayMoreEfficientWriteOut()
    {
        int[,] localArray = some.XArrayCopy();

        for (int row = 0; row < localArray.GetLength(0); row++)
            for (int col = 0; col < localArray.GetLength(1); col++)
                Console.Write(localArray[row, col].ToString());
    }

}


}

C＃类返回二维数组

2 个答案: