using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Drawing;

using System.Drawing.Imaging;

using System.Collections;

namespace YEMLWEB.AppHelper

{

    public class Picturexif

    {

        #region 构造函数

        /// <summary>

        /// 构造函数

        /// </summary>

        public Picturexif()

        {

        }

        #endregion

        #region 数据转换结构

        /// <summary>

        /// 转换数据结构

        /// </summary>

        public struct MetadataDetail

        {

            public string Hex;//十六进制字符串

            public string RawValueAsString;//原始值串

            public string DisplayValue;//显示值串

        }

        #endregion

        #region EXIF元素结构

        /// <summary>

        /// 结构：存储EXIF元素信息

        /// </summary>

        public struct Metadata

        {

            public MetadataDetail EquipmentMake;

            public MetadataDetail CameraModel;

            public MetadataDetail ExposureTime;//曝光时间

            public MetadataDetail Fstop;

            public MetadataDetail DatePictureTaken;

            public MetadataDetail ShutterSpeed;// 快门速度

            public MetadataDetail MeteringMode;//曝光模式

            public MetadataDetail Flash;//闪光灯

            public MetadataDetail XResolution;

            public MetadataDetail YResolution;

            public MetadataDetail ImageWidth;//照片宽度

            public MetadataDetail ImageHeight;//照片高度 

            public MetadataDetail FNumber;// added f值，光圈数

            public MetadataDetail ExposureProg;// added 曝光程序

            public MetadataDetail SpectralSense;// added

            public MetadataDetail ISOSpeed;// added ISO感光度

            public MetadataDetail OECF;// added

            public MetadataDetail Ver;// added EXIF版本

            public MetadataDetail CompConfig;// added 色彩设置

            public MetadataDetail CompBPP;// added 压缩比率

            public MetadataDetail Aperture;// added 光圈值

            public MetadataDetail Brightness;// added 亮度值Ev

            public MetadataDetail ExposureBias;// added 曝光补偿

            public MetadataDetail MaxAperture;// added 最大光圈值 

            public MetadataDetail SubjectDist;// added主体距离

            public MetadataDetail LightSource;// added 白平衡

            public MetadataDetail FocalLength;// added 焦距

            public MetadataDetail FPXVer;// added FlashPix版本

            public MetadataDetail ColorSpace;// added 色彩空间

            public MetadataDetail Interop;// added

            public MetadataDetail FlashEnergy;// added

            public MetadataDetail SpatialFR;// added

            public MetadataDetail FocalXRes;// added

            public MetadataDetail FocalYRes;// added

            public MetadataDetail FocalResUnit;// added

            public MetadataDetail ExposureIndex;// added 曝光指数

            public MetadataDetail SensingMethod;// added 感应方式

            public MetadataDetail SceneType;// added

            public MetadataDetail CfaPattern;// added

        }

        #endregion

        #region 查找EXIF元素值

        public string LookupEXIFValue(string Description, string Value)

        {

            string DescriptionValue = null;

            switch (Description)

            {

                case "MeteringMode":

                    #region  MeteringMode

                    {

                        switch (Value)

                        {

                            case "":

                                DescriptionValue = "Unknown"; break;

                            case "":

                                DescriptionValue = "Average"; break;

                            case "":

                                DescriptionValue = "Center Weighted Average"; break;

                            case "":

                                DescriptionValue = "Spot"; break;

                            case "":

                                DescriptionValue = "Multi-spot"; break;

                            case "":

                                DescriptionValue = "Multi-segment"; break;

                            case "":

                                DescriptionValue = "Partial"; break;

                            case "":

                                DescriptionValue = "Other"; break;

                        }

                    }

                    #endregion

                    break;

                case "ResolutionUnit":

                    #region ResolutionUnit

                    {

                        switch (Value)

                        {

                            case "":

                                DescriptionValue = "No Units"; break;

                            case "":

                                DescriptionValue = "Inch"; break;

                            case "":

                                DescriptionValue = "Centimeter"; break;

                        }

                    }

                    #endregion

                    break;

                case "Flash":

                    #region Flash

                    {

                        switch (Value)

                        {

                            case "":

                                DescriptionValue = "未使用"; break;

                            case "":

                                DescriptionValue = "闪光"; break;

                            case "":

                                DescriptionValue = "Flash fired but strobe return light not detected"; break;

                            case "":

                                DescriptionValue = "Flash fired and strobe return light detected"; break;

                        }

                    }

                    #endregion

                    break;

                case "ExposureProg":

                    #region ExposureProg

                    {

                        switch (Value)

                        {

                            case "":

                                DescriptionValue = "没有定义"; break;

                            case "":

                                DescriptionValue = "手动控制"; break;

                            case "":

                                DescriptionValue = "程序控制"; break;

                            case "":

                                DescriptionValue = "光圈优先"; break;

                            case "":

                                DescriptionValue = "快门优先"; break;

                            case "":

                                DescriptionValue = "夜景模式"; break;

                            case "":

                                DescriptionValue = "运动模式"; break;

                            case "":

                                DescriptionValue = "肖像模式"; break;

                            case "":

                                DescriptionValue = "风景模式"; break;

                            case "":

                                DescriptionValue = "保留的"; break;

                        }

                    }

                    #endregion

                    break;

                case "CompConfig":

                    #region CompConfig

                    {

                        switch (Value)

                        {

                            case "":

                                DescriptionValue = "YCbCr"; break;

                        }

                    }

                    #endregion

                    break;

                case "Aperture":

                    #region Aperture

                    DescriptionValue = Value;

                    #endregion

                    break;

                case "LightSource":

                    #region LightSource

                    {

                        switch (Value)

                        {

                            case "":

                                DescriptionValue = "未知"; break;

                            case "":

                                DescriptionValue = "日光"; break;

                            case "":

                                DescriptionValue = "荧光灯"; break;

                            case "":

                                DescriptionValue = "白炽灯"; break;

                            case "":

                                DescriptionValue = "闪光灯"; break;

                            case "":

                                DescriptionValue = "标准光A"; break;

                            case "":

                                DescriptionValue = "标准光B"; break;

                            case "":

                                DescriptionValue = "标准光C"; break;

                            case "":

                                DescriptionValue = "标准光D55"; break;

                            case "":

                                DescriptionValue = "标准光D65"; break;

                            case "":

                                DescriptionValue = "标准光D75"; break;

                            case "":

                                DescriptionValue = "其它"; break;

                        }

                    }

                    #endregion

                    break;

            }

            return DescriptionValue;

        }

        #endregion

        #region 取得图片的EXIF信息

        public Metadata GetEXIFMetaData(string PhotoName)

        {

            // 创建一个图片的实例

            System.Drawing.Image MyImage = System.Drawing.Image.FromFile(PhotoName);

            // 创建一个整型数组来存储图像中属性数组的ID

            int[] MyPropertyIdList = MyImage.PropertyIdList;

            //创建一个封闭图像属性数组的实例

            PropertyItem[] MyPropertyItemList = new PropertyItem[MyPropertyIdList.Length];

            //创建一个图像EXIT信息的实例结构对象，并且赋初值 

            #region 创建一个图像EXIT信息的实例结构对象，并且赋初值

            Metadata MyMetadata = new Metadata();

            MyMetadata.EquipmentMake.Hex = "10f";

            MyMetadata.CameraModel.Hex = "";

            MyMetadata.DatePictureTaken.Hex = "";

            MyMetadata.ExposureTime.Hex = "829a";

            MyMetadata.Fstop.Hex = "829d";

            MyMetadata.ShutterSpeed.Hex = "";

            MyMetadata.MeteringMode.Hex = "";

            MyMetadata.Flash.Hex = "";

            MyMetadata.FNumber.Hex = "829d"; //added

            MyMetadata.ExposureProg.Hex = ""; //added

            MyMetadata.SpectralSense.Hex = ""; //added

            MyMetadata.ISOSpeed.Hex = ""; //added

            MyMetadata.OECF.Hex = ""; //added

            MyMetadata.Ver.Hex = ""; //added

            MyMetadata.CompConfig.Hex = ""; //added

            MyMetadata.CompBPP.Hex = ""; //added

            MyMetadata.Aperture.Hex = ""; //added

            MyMetadata.Brightness.Hex = ""; //added

            MyMetadata.ExposureBias.Hex = ""; //added

            MyMetadata.MaxAperture.Hex = ""; //added

            MyMetadata.SubjectDist.Hex = ""; //added

            MyMetadata.LightSource.Hex = ""; //added

            MyMetadata.FocalLength.Hex = "920a"; //added

            MyMetadata.FPXVer.Hex = "a000"; //added

            MyMetadata.ColorSpace.Hex = "a001"; //added

            MyMetadata.FocalXRes.Hex = "a20e"; //added

            MyMetadata.FocalYRes.Hex = "a20f"; //added

            MyMetadata.FocalResUnit.Hex = "a210"; //added

            MyMetadata.ExposureIndex.Hex = "a215"; //added

            MyMetadata.SensingMethod.Hex = "a217"; //added

            MyMetadata.SceneType.Hex = "a301";

            MyMetadata.CfaPattern.Hex = "a302";

            #endregion

            // ASCII编码

            System.Text.ASCIIEncoding Value = new System.Text.ASCIIEncoding();

            int index = ;

            int MyPropertyIdListCount = MyPropertyIdList.Length;

            if (MyPropertyIdListCount != )

            {

                foreach (int MyPropertyId in MyPropertyIdList)

                {

                    string hexVal = "";

                    MyPropertyItemList[index] = MyImage.GetPropertyItem(MyPropertyId);

                    #region 初始化各属性值

                    string myPropertyIdString = MyImage.GetPropertyItem(MyPropertyId).Id.ToString("x");

                    switch (myPropertyIdString)

                    {

                        case "10f":

                            {

                                MyMetadata.EquipmentMake.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value);

                                MyMetadata.EquipmentMake.DisplayValue = Value.GetString(MyPropertyItemList[index].Value);

                                break;

                            }

                        case "":

                            {

                                MyMetadata.CameraModel.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value);

                                MyMetadata.CameraModel.DisplayValue = Value.GetString(MyPropertyItemList[index].Value);

                                break;

                            }

                        case "":

                            {

                                MyMetadata.DatePictureTaken.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value);

                                MyMetadata.DatePictureTaken.DisplayValue = Value.GetString(MyPropertyItemList[index].Value);

                                break;

                            }

                        case "":

                            {

                                MyMetadata.MeteringMode.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value);

                                MyMetadata.MeteringMode.DisplayValue = LookupEXIFValue("MeteringMode", BitConverter.ToInt16(MyImage.GetPropertyItem(MyPropertyId).Value, ).ToString());

                                break;

                            }

                        case "":

                            {

                                MyMetadata.Flash.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value);

                                MyMetadata.Flash.DisplayValue = LookupEXIFValue("Flash", BitConverter.ToInt16(MyImage.GetPropertyItem(MyPropertyId).Value, ).ToString());

                                break;

                            }

                        case "829a":

                            {

                                MyMetadata.ExposureTime.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value);

                                string StringValue = "";

                                for (int Offset = ; Offset < MyImage.GetPropertyItem(MyPropertyId).Len; Offset = Offset + )

                                {

                                    StringValue += BitConverter.ToInt32(MyImage.GetPropertyItem(MyPropertyId).Value, Offset).ToString() + "/";

                                }

                                MyMetadata.ExposureTime.DisplayValue = StringValue.Substring(, StringValue.Length - );

                                break;

                            }

                        case "829d":

                            {

                                MyMetadata.Fstop.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value);

                                int int1;

                                int int2;

                                int1 = BitConverter.ToInt32(MyImage.GetPropertyItem(MyPropertyId).Value, );

                                int2 = BitConverter.ToInt32(MyImage.GetPropertyItem(MyPropertyId).Value, );

                                MyMetadata.Fstop.DisplayValue = "F/" + (int1 / int2);

                                MyMetadata.FNumber.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value);

                                MyMetadata.FNumber.DisplayValue = BitConverter.ToInt16(MyImage.GetPropertyItem(MyPropertyId).Value, ).ToString();

                                break;

                            }

                        case "":

                            {

                                MyMetadata.ShutterSpeed.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value);

                                string StringValue = BitConverter.ToInt32(MyImage.GetPropertyItem(MyPropertyId).Value, ).ToString();

                                MyMetadata.ShutterSpeed.DisplayValue = "1/" + StringValue;

                                break;

                            }

                        case "":

                            {

                                MyMetadata.ExposureProg.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value);

                                MyMetadata.ExposureProg.DisplayValue = LookupEXIFValue("ExposureProg", BitConverter.ToInt16(MyImage.GetPropertyItem(MyPropertyId).Value, ).ToString());

                                break;

                            }

                        case "":

                            {

                                MyMetadata.SpectralSense.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value);

                                MyMetadata.SpectralSense.DisplayValue = Value.GetString(MyPropertyItemList[index].Value);

                                break;

                            }

                        case "":

                            {

                                hexVal = "";

                                MyMetadata.ISOSpeed.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value);

                                hexVal = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value).Substring(, );

                                MyMetadata.ISOSpeed.DisplayValue = Convert.ToInt32(hexVal, ).ToString();//Value.GetString(MyPropertyItemList[index].Value);

                                break;

                            }

                        case "":

                            {

                                MyMetadata.OECF.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value);

                                MyMetadata.OECF.DisplayValue = Value.GetString(MyPropertyItemList[index].Value);

                                break;

                            }

                        case "":

                            {

                                MyMetadata.Ver.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value);

                                MyMetadata.Ver.DisplayValue = Value.GetString(MyPropertyItemList[index].Value).Substring(, ) + "." + Value.GetString(MyPropertyItemList[index].Value).Substring(, );

                                break;

                            }

                        case "":

                            {

                                MyMetadata.CompConfig.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value);

                                MyMetadata.CompConfig.DisplayValue = LookupEXIFValue("CompConfig", BitConverter.ToInt16(MyImage.GetPropertyItem(MyPropertyId).Value, ).ToString());

                                break;

                            }

                        case "":

                            {

                                MyMetadata.CompBPP.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value);

                                MyMetadata.CompBPP.DisplayValue = BitConverter.ToInt16(MyImage.GetPropertyItem(MyPropertyId).Value, ).ToString();

                                break;

                            }

                        case "":

                            {

                                hexVal = "";

                                MyMetadata.Aperture.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value);

                                hexVal = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value).Substring(, );

                                hexVal = Convert.ToInt32(hexVal, ).ToString();

                                hexVal = hexVal + "";

                                MyMetadata.Aperture.DisplayValue = hexVal.Substring(, ) + "." + hexVal.Substring(, );

                                break;

                            }

                        case "":

                            {

                                hexVal = "";

                                MyMetadata.Brightness.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value);

                                hexVal = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value).Substring(, );

                                hexVal = Convert.ToInt32(hexVal, ).ToString();

                                hexVal = hexVal + "";

                                MyMetadata.Brightness.DisplayValue = hexVal.Substring(, ) + "." + hexVal.Substring(, );

                                break;

                            }

                        case "":

                            {

                                MyMetadata.ExposureBias.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value);

                                MyMetadata.ExposureBias.DisplayValue = BitConverter.ToInt16(MyImage.GetPropertyItem(MyPropertyId).Value, ).ToString();

                                break;

                            }

                        case "":

                            {

                                hexVal = "";

                                MyMetadata.MaxAperture.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value);

                                hexVal = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value).Substring(, );

                                hexVal = Convert.ToInt32(hexVal, ).ToString();

                                hexVal = hexVal + "";

                                MyMetadata.MaxAperture.DisplayValue = hexVal.Substring(, ) + "." + hexVal.Substring(, );

                                break;

                            }

                        case "":

                            {

                                MyMetadata.SubjectDist.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value);

                                MyMetadata.SubjectDist.DisplayValue = Value.GetString(MyPropertyItemList[index].Value);

                                break;

                            }

                        case "":

                            {

                                MyMetadata.LightSource.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value);

                                MyMetadata.LightSource.DisplayValue = LookupEXIFValue("LightSource", BitConverter.ToInt16(MyImage.GetPropertyItem(MyPropertyId).Value, ).ToString());

                                break;

                            }

                        case "920a":

                            {

                                hexVal = "";

                                MyMetadata.FocalLength.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value);

                                hexVal = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value).Substring(, );

                                hexVal = Convert.ToInt32(hexVal, ).ToString();

                                hexVal = hexVal + "";

                                MyMetadata.FocalLength.DisplayValue = hexVal.Substring(, ) + "." + hexVal.Substring(, );

                                break;

                            }

                        case "a000":

                            {

                                MyMetadata.FPXVer.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value);

                                MyMetadata.FPXVer.DisplayValue = Value.GetString(MyPropertyItemList[index].Value).Substring(, ) + "." + Value.GetString(MyPropertyItemList[index].Value).Substring(, );

                                break;

                            }

                        case "a001":

                            {

                                MyMetadata.ColorSpace.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value);

                                if (BitConverter.ToInt16(MyImage.GetPropertyItem(MyPropertyId).Value, ).ToString() == "")

                                    MyMetadata.ColorSpace.DisplayValue = "RGB";

                                if (BitConverter.ToInt16(MyImage.GetPropertyItem(MyPropertyId).Value, ).ToString() == "")

                                    MyMetadata.ColorSpace.DisplayValue = "Uncalibrated";

                                break;

                            }

                        case "a20e":

                            {

                                MyMetadata.FocalXRes.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value);

                                MyMetadata.FocalXRes.DisplayValue = BitConverter.ToInt16(MyImage.GetPropertyItem(MyPropertyId).Value, ).ToString();

                                break;

                            }

                        case "a20f":

                            {

                                MyMetadata.FocalYRes.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value);

                                MyMetadata.FocalYRes.DisplayValue = BitConverter.ToInt16(MyImage.GetPropertyItem(MyPropertyId).Value, ).ToString();

                                break;

                            }

                        case "a210":

                            {

                                string aa;

                                MyMetadata.FocalResUnit.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value);

                                aa = BitConverter.ToInt16(MyImage.GetPropertyItem(MyPropertyId).Value, ).ToString(); ;

                                if (aa == "") MyMetadata.FocalResUnit.DisplayValue = "没有单位";

                                if (aa == "") MyMetadata.FocalResUnit.DisplayValue = "英尺";

                                if (aa == "") MyMetadata.FocalResUnit.DisplayValue = "厘米";

                                break;

                            }

                        case "a215":

                            {

                                MyMetadata.ExposureIndex.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value);

                                MyMetadata.ExposureIndex.DisplayValue = Value.GetString(MyPropertyItemList[index].Value);

                                break;

                            }

                        case "a217":

                            {

                                string aa;

                                aa = BitConverter.ToInt16(MyImage.GetPropertyItem(MyPropertyId).Value, ).ToString();

                                MyMetadata.SensingMethod.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value);

                                if (aa == "") MyMetadata.SensingMethod.DisplayValue = "1 chip color area sensor";

                                break;

                            }

                        case "a301":

                            {

                                MyMetadata.SceneType.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value);

                                MyMetadata.SceneType.DisplayValue = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value);

                                break;

                            }

                        case "a302":

                            {

                                MyMetadata.CfaPattern.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value);

                                MyMetadata.CfaPattern.DisplayValue = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value);

                                break;

                            }

                    }

                    #endregion

                    index++;

                }

            }

            MyMetadata.XResolution.DisplayValue = MyImage.HorizontalResolution.ToString();

            MyMetadata.YResolution.DisplayValue = MyImage.VerticalResolution.ToString();

            MyMetadata.ImageHeight.DisplayValue = MyImage.Height.ToString();

            MyMetadata.ImageWidth.DisplayValue = MyImage.Width.ToString();

            MyImage.Dispose();

            return MyMetadata;

        }

        #endregion

    }

}

            Picturexif em = new Picturexif();

            string filePath = Server.MapPath("Test.jpg");//这里可以动态传递图片路径的 

            Picturexif.Metadata m = em.GetEXIFMetaData(filePath);//这里就是调用，传图片绝对路径 

            string exif = m.Ver.DisplayValue;

            string camera = m.CameraModel.DisplayValue;

            string model = m.CameraModel.DisplayValue;

            string aperture = m.Aperture.DisplayValue;

            string shutter = m.ShutterSpeed.DisplayValue;

            string sensitive = m.ExposureIndex.DisplayValue;