[代码片段] 获取分辨率DPI和像素、毫米、英寸互相转换

private static float DEFAULT_DPI_X = 0;
private static float DEFAULT_DPI_Y = 0;

/// <summary>获取分辨率DPI</summary>
/// <param name="dpiX"></param>
/// <param name="dpiY"></param>
public static void GetDPI(out float dpiX, out float dpiY)
{
if (DEFAULT_DPI_X == 0 || DEFAULT_DPI_Y == 0)
{
using (Bitmap map = new Bitmap(100, 100))
{
using (Graphics g = Graphics.FromImage(map))
{
DEFAULT_DPI_X = g.DpiX;
DEFAULT_DPI_Y = g.DpiY;
}
}
}
dpiX = DEFAULT_DPI_X;
dpiY = DEFAULT_DPI_Y;
}
/// <summary>
/// 毫米转为像素(注：dpi分水平和垂直，获取方法为得到 Graphics 的实例化对象 g，调用g.DpiX、g.DpiY)
/// </summary>
/// <param name="mm">毫米</param>
/// <param name="fDPI">分辨率(水平/垂直)</param>
/// <returns></returns>
public static float MillimetersToPixel(float mm, float fDPI)
{
//毫米转像素：mm * dpi / 25.4
return (float)Math.Round((mm * fDPI / 25.4f), 2);
}
/// <summary>
/// 像素转为毫米(注：dpi分水平和垂直，获取方法为得到 Graphics 的实例化对象 g，调用g.DpiX、g.DpiY)
/// </summary>
/// <param name="px">像素</param>
/// <param name="fDPI">分辨率(水平/垂直)</param>
/// <returns></returns>
public static float PixelToMillimeters(float px, float fDPI)
{
//像素转毫米：px * 25.4 / dpi
return (float)Math.Round(((px * 25.4f) / fDPI), 2); ;
}
/// <summary>
/// 英寸到像素
/// </summary>
/// <param name="inches"></param>
/// <returns></returns>
public static float InchesToPixels(float inches, float fDPI)
{
return (float)Math.Round(inches * fDPI, 2);
}
/// <summary>
/// 像素到英寸
/// </summary>
/// <param name="px"></param>
/// <returns></returns>
public static float PixelsToInches(float px, float fDPI)
{
return (float)Math.Round(px / fDPI, 2);
}
/// <summary>
/// 毫米到英寸
/// </summary>
/// <param name="mm"></param>
/// <returns></returns>
public static float MillimetersToInches(float mm)
{
return (float)Math.Round(mm / 25.4f, 2);
}
/// <summary>
/// 英寸到毫米
/// </summary>
/// <param name="mm"></param>
/// <returns></returns>
public static float InchesToMillimeters(float Inches)
{
return (float)Math.Round(Inches * 25.4f, 2);
}

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原文链接：https://blog.csdn.net/michelsn/article/details/80287160