Range.cs

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namespace System.Data;
 
internal struct Range
{
    private readonly int _min;
 
    private readonly int _max;
 
    private readonly bool _isNotNull;
 
    public int Count
    {
        get
        {
            if (!IsNull)
            {
                return _max - _min + 1;
            }
            return 0;
        }
    }
 
    public bool IsNull => !_isNotNull;
 
    public int Max
    {
        get
        {
            CheckNull();
            return _max;
        }
    }
 
    public int Min
    {
        get
        {
            CheckNull();
            return _min;
        }
    }
 
    public Range(int min, int max)
    {
        if (min > max)
        {
            throw ExceptionBuilder.RangeArgument(min, max);
        }
        _min = min;
        _max = max;
        _isNotNull = true;
    }
 
    internal void CheckNull()
    {
        if (IsNull)
        {
            throw ExceptionBuilder.NullRange();
        }
    }
}