c#使用ExifLib库提取图像的相机型号、光圈、快门、iso、曝光时间、焦距信息等EXIF信息

近期公司组织了书画摄影比赛，本人作为摄影爱好者，平时也会拍些照片，这次比赛当然不能错过。为了提高获奖概率，选了19张图像作为参赛作品。但是，摄影作品要提交图像的光圈、曝光时间等参数。一两张还可以通过电脑自带软件右键查看图像参数并一个个复制，但现在有19张，让我一点点复制还不如直接放弃参与了。谁让咱们还有一个身份是coder，那就现场手撸个小程序批量输出图像的EXIF信息。

开发需求很简单，就是能手动选取一个文件夹，然后读取该路径下的所有文件（图片），然后提取每张图像的exif信息，并将结果显示到界面，然后将Ctrl + A复制所有信息即可。在开发上，语言选择c#，搭配WPF框架，并选择ExifLib这个轻量化的EXIF信息提取库获取图像参数信息，下图是最终的提取信息。
在这里插入图片描述
XAML主要代码：

    <Grid><Grid.RowDefinitions><RowDefinition Height="*"/><RowDefinition Height="auto"/></Grid.RowDefinitions><TextBox x:Name="textBox" Grid.Row="0"/><Button Content="请选择一个路径"  Click="Button_Click"  Grid.Row="1" Background="LightBlue" Margin="2,0,2,2" Padding="5" /></Grid>

cs逻辑代码：

		using ExifLib;private void Button_Click(object sender, RoutedEventArgs e){// 创建一个选择文件路径的对话框OpenFileDialog openFileDialog = new OpenFileDialog();openFileDialog.Multiselect = false;openFileDialog.CheckFileExists = false;openFileDialog.FileName = "Folder Selection.";openFileDialog.Filter = "Folders|no.files";Dictionary<string, string> dic_pathAndName = new Dictionary<string, string>();if (openFileDialog.ShowDialog() == true){string folderPath = System.IO.Path.GetDirectoryName(openFileDialog.FileName);// 使用 DirectoryInfo 类获取该路径下的所有文件DirectoryInfo directoryInfo = new DirectoryInfo(folderPath);FileInfo[] fileInfos = directoryInfo.GetFiles();// 处理获取到的文件foreach (FileInfo fileInfo in fileInfos){Debug.WriteLine(fileInfo.Name);//dic_pathAndName[System.IO.Path.GetFileNameWithoutExtension(fileInfo.FullName)] = fileInfo.FullName;//key为没有后缀名的文件名dic_pathAndName[fileInfo.Name] = fileInfo.FullName;}}if (dic_pathAndName.Count == 0) return;foreach (var dic in dic_pathAndName){Debug.WriteLine($"{dic.Key}:  {getImageExifInfo(dic.Value)}");textBox.AppendText($"{dic.Key}, {getImageExifInfo(dic.Value)}\n");}}string getImageExifInfo(string path){if (!File.Exists(path)) return "";string res = "";try{using (ExifReader reader = new ExifReader(path)){// 相机制造商if (reader.GetTagValue(ExifTags.Make, out string make))Debug.WriteLine("相机制造商: " + make);// 相机型号if (reader.GetTagValue(ExifTags.Model, out string model))Debug.WriteLine("相机型号: " + model);// 光圈if (reader.GetTagValue(ExifTags.FNumber, out double fNumber)){var fNumberFraction = FractionFromDouble(fNumber);Debug.WriteLine("光圈: F/" + fNumber);}string time = "";// 快门速度if (reader.GetTagValue(ExifTags.ExposureTime, out double exposureTime)){var exposureTimeFraction = FractionFromDouble(exposureTime);time = exposureTimeFraction.Item1 + "/" + exposureTimeFraction.Item2;}// ISOif (reader.GetTagValue(ExifTags.ISOSpeedRatings, out ushort isoSpeedRatings))Debug.WriteLine("ISO: " + isoSpeedRatings); 曝光时间//if (reader.GetTagValue(ExifTags.ExposureTime, out double exposureTime))//    Debug.WriteLine("曝光时间: " + exposureTime.ToString("0.##") + " s");// 焦距if (reader.GetTagValue(ExifTags.FocalLength, out double focalLength))Debug.WriteLine("焦距: " + focalLength.ToString("0.##") + " mm");res = $"{model} f/{fNumber} {time}s ISO-{isoSpeedRatings} {focalLength}mm";}}catch (Exception e){}return res;}private Tuple<int, int> FractionFromDouble(double value, double error = 0.0001){int denominator = 1;while (Math.Abs(value * denominator - Math.Round(value * denominator)) > error)denominator++;return Tuple.Create((int)Math.Round(value * denominator), denominator);}