简便的用c#读取EXIF中的信息

发布日期：2017年05月02日文章来源：www.tengways.com

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手机让生活变得十分的便利。然而手机却往往给程序员们埋下大坑，之前在上传图片是遇到了用手机拍的照片在前端显示时发生旋转。这是由于手机拍照会把方向等信息存入在EXIF里。最后在手机展示时，照片的旋转就又产生了。

来看看c#如何读取EXIF的信息吧：

//private static Dictionary<string, string> ReadExif(System.Drawing.Image image)

//{

// var exif = new Dictionary<string, string>();

// var properties = image.PropertyItems;

// foreach (var property in properties)

// {

// switch (property.Id)

// {

// case 0x010E:

// exif["ImageTitle"] = ASCIIToString(property.Value);

// break;

// case 0x010F:

// exif["Make"] = ASCIIToString(property.Value);

// break;

// case 0x0110:

// exif["Model"] = ASCIIToString(property.Value);

// break;

// case 0x0112:

// exif["Orientation"] = ShortToString(property.Value, 0);

// break;

// case 0x011A:

// exif["XResolution"] = RationalToSingle(property.Value, 0);

// break;

// case 0x011B:

// exif["YResolution"] = RationalToSingle(property.Value, 0);

// break;

// case 0x0128:

// exif["ResolutionUnit"] = ShortToString(property.Value, 0);

// break;

// case 0x0131:

// exif["Software"] = ASCIIToString(property.Value);

// break;

// case 0x0132:

// exif["DateTime"] = ASCIIToString(property.Value);

// break;

// //GPS

// case 0x0002:

// exif["GPSLatitude"] = string.Format("{0}°{1}′{2}″",

// RationalToSingle(property.Value, 0),

// RationalToSingle(property.Value, 8),

// RationalToSingle(property.Value, 16)

// );

// break;

// case 0x0004:

// exif["GPSLongitude"] = string.Format("{0}°{1}′{2}″",

// RationalToSingle(property.Value, 0),

// RationalToSingle(property.Value, 8),

// RationalToSingle(property.Value, 16)

// );

// break;

// case 0x0006:

// exif["GPSAltitude"] = RationalToSingle(property.Value, 0);

// break;

// }

// return exif;

//}

//static string ByteToString(byte[] b, int startindex)

//{

// if (startindex + 1 <= b.Length)

// return ((char)b[startindex]).ToString();

// else

// return string.Empty;

//}

//static string ShortToString(byte[] b, int startindex)

//{

// if (startindex + 2 <= b.Length)

// return BitConverter.ToInt16(b, startindex).ToString();

// else

// return string.Empty;

//}

//static string RationalToSingle(byte[] b, int startindex)

//{

// if (startindex + 8 <= b.Length)

// return (BitConverter.ToSingle(b, startindex) / BitConverter.ToSingle(b, startindex + 4)).ToString();

// else

// return string.Empty;

//}

//static string ASCIIToString(byte[] b)

//{

// return Encoding.ASCII.GetString(b);

//}

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简便的用c#读取EXIF中的信息