雙數和小數比較器

Question

我創建了以下 Double 比較器來精確比較 2 個雙精度：

  class DoubleComparer : IEqualityComparer<Double> {

    private readonly int _precision;

    public DoubleComparer(int precision)
    {
        _precision = precision;
    }

    public bool Equals(double x, double y)
    {
        return Double.Equals(Math.Round(x, _precision), Math.Round(y, _precision));
    }

    public int GetHashCode(double obj)
    {
       return obj.GetHashCode();
    }

  }

我也想比較小數。

我可以創建一個可以處理雙精度和十進制的比較器嗎？

還是我需要兩個？

Answer 1

您可以只實現多個接口。 例如：

class DecimalAndDoubleComparer : IEqualityComparer<Double>, IEqualityComparer<decimal>
{

    private readonly int _precision;

    public DecimalAndDoubleComparer(int precision)
    {
        _precision = precision;
    }

    public bool Equals(double x, double y)
    {
        return Math.Round(x, _precision) == Math.Round(y, _precision);
    }

    public int GetHashCode(double obj)
    {
        return obj.GetHashCode();
    }

    public bool Equals(decimal x, decimal y)
    {
        return Math.Round(x, _precision) == Math.Round(y, _precision);
    }

    public int GetHashCode(decimal obj)
    {
        return obj.GetHashCode();
    }
}