namespace System

{

/// <summary>

/// 小数数字转换为整数数字格式

/// </summary>

public enum NumberToInt32Format

{

/// <summary>

/// 四舍五入

/// </summary>

RoundAwayFromZero,

/// <summary>

/// 五舍六入

/// </summary>

Round,

/// <summary>

/// 仅取整数

/// </summary>

Floor,

/// <summary>

/// 进一法

/// </summary>

Ceiling,

}

/// <summary>

/// Enum 扩展 <see cref="NumberToInt32Format"/>

/// </summary>

public static partial class NumberToInt32FormatEnumExtensions

{

public static int ToInt32(this float value, NumberToInt32Format format = NumberToInt32Format.Floor) => format switch

{

NumberToInt32Format.RoundAwayFromZero => (int)MathF.Round(value, MidpointRounding.AwayFromZero),

NumberToInt32Format.Round => (int)MathF.Round(value),

NumberToInt32Format.Floor => (int)MathF.Floor(value),

NumberToInt32Format.Ceiling => (int)MathF.Ceiling(value),

_ => throw new ArgumentOutOfRangeException(nameof(format), format, null),

};

public static int ToInt32(this double value, NumberToInt32Format format = NumberToInt32Format.Floor) => format switch

{

NumberToInt32Format.RoundAwayFromZero => (int)Math.Round(value, MidpointRounding.AwayFromZero),

NumberToInt32Format.Round => (int)Math.Round(value),

NumberToInt32Format.Floor => (int)Math.Floor(value),

NumberToInt32Format.Ceiling => (int)Math.Ceiling(value),

_ => throw new ArgumentOutOfRangeException(nameof(format), format, null),

};

}

}