查找和防止StackOverflow

Question

我有一个代码，似乎工作在我的计算机上的Visual Studio code (Windows 11, c#，最新的更新和一切最新的)，但不是在一个测试，它使用Mono编译器(Linux, c# 7兼容)。唯一不同的是，当为null时，我将其更改为== null，因为否则它将无法运行。

// BitMatrix.cs
using System;
using System.Collections;
using System.Collections.Generic;
public class BitMatrix : IEquatable<BitMatrix>
{
private BitArray data;
public int NumberOfRows { get; }
public int NumberOfColumns { get; }
public bool IsReadOnly => false;
public BitMatrix(int numberOfRows, int numberOfColumns, params int[] bits)
{
if (numberOfRows < 1 || numberOfColumns < 1)
throw new ArgumentOutOfRangeException("Incorrect size of matrix");
data = new BitArray(numberOfRows * numberOfColumns, false);
if (bits != null)
{
for (int i = 0; i < bits.Length && i < data.Length; i++)
{
if (bits[i] != 0)
data[i] = true;
}
}
NumberOfRows = numberOfRows;
NumberOfColumns = numberOfColumns;
}
public BitMatrix(int[,] bits)
{
if (bits == null)
throw new NullReferenceException("bits cannot be null");
int numberOfRows = bits.GetLength(0);
int numberOfColumns = bits.GetLength(1);
if (numberOfRows < 1 || numberOfColumns < 1)
throw new ArgumentOutOfRangeException("Incorrect size of matrix");
data = new BitArray(numberOfRows * numberOfColumns, false);
for (int row = 0; row < numberOfRows; row++)
{
for (int col = 0; col < numberOfColumns; col++)
{
if (bits[row, col] != 0)
data[row * numberOfColumns + col] = true;
}
}
NumberOfRows = numberOfRows;
NumberOfColumns = numberOfColumns;
}
public BitMatrix(bool[,] bits)
{
if (bits == null)
throw new NullReferenceException("bits cannot be null");
int numberOfRows = bits.GetLength(0);
int numberOfColumns = bits.GetLength(1);
if (numberOfRows < 1 || numberOfColumns < 1)
throw new ArgumentOutOfRangeException("Incorrect size of matrix");
data = new BitArray(numberOfRows * numberOfColumns, false);
for (int row = 0; row < numberOfRows; row++)
{
for (int col = 0; col < numberOfColumns; col++)
{
if (bits[row, col])
data[row * numberOfColumns + col] = true;
}
}
NumberOfRows = numberOfRows;
NumberOfColumns = numberOfColumns;
}
public static int BoolToBit(bool boolValue) => boolValue ? 1 : 0;
public static bool BitToBool(int bit) => bit != 0;
public override string ToString()
{
var result = "";
for (int row = 0; row < NumberOfRows; row++)
{
for (int col = 0; col < NumberOfColumns; col++)
{
int index = row * NumberOfColumns + col;
result += BoolToBit(data[index]);
}
result += Environment.NewLine; // dodanie znaku końca linii
}
return result;
}
public bool Equals(BitMatrix? matrix)
{
if (matrix is null || NumberOfRows != matrix.NumberOfRows || NumberOfColumns != matrix.NumberOfColumns) return false;
for (int i = 0; i < data.Length; i++)
{
if (data[i] != matrix.data[i]) return false;
} 
return true;
}
public override bool Equals(object? obj)
{
if (obj == null || GetType() != obj.GetType()) return false;
else return Equals((BitMatrix)obj);
}
public override int GetHashCode()
{
int hash = 17;
hash = hash * 23 + NumberOfRows.GetHashCode();
hash = hash * 23 + NumberOfColumns.GetHashCode();

for (int i = 0; i < data.Length; i++)
{
hash = hash * 23 + data[i].GetHashCode();
}
return hash;
}
public static bool operator ==(BitMatrix matrix1, BitMatrix matrix2)
{
if (ReferenceEquals(matrix1, matrix2)) return true;
if (matrix1 is null || matrix2 is null) return false;
return matrix1.Equals(matrix2);
}
public static bool operator !=(BitMatrix matrix1, BitMatrix matrix2)
{
return !(matrix1 == matrix2);
}
}

在主文件(Program.cs)上，当使用以下命令时，它应该返回True(在我的comp上确实如此!)，

// `Equals` for the same object
var m1 = new BitMatrix(5, 6);
var m2 = m1;
Console.WriteLine(m1.Equals(m2));

但是它返回

Unhandled Exception:
StackOverflowException
[ERROR] FATAL UNHANDLED EXCEPTION: System.StackOverflowException: The requested operation caused a stack overflow.
at BitMatrix.op_Equality (BitMatrix matrix1, BitMatrix matrix2) <0x40c71820 + 0x00004> in <ee17de3584e0451aa17782759cde6afe>:0

Answer 1

好的，我通过添加if (object.ReferenceEquals(this, matrix)) return true;手动检查对象是否在public bool Equals(BitMatrix matrix)中相同的实例来修复它。我想Mono编译器不会自己做这件事。