图片格式未知

Question

我正在尝试使用 .Net Core 2.2 将图像读入 Base64 格式并抛出

ArgumentException：图像格式未知。System.Drawing.Image.FromFile（字符串文件名，bool useEmbeddedColorManagement）

filePath 是正确的，我已经双重和三次检查文件是否存在。

我试图用大写和小写扩展名命名我的 PNG。

这不会在 Windows 上本地发生，但是一旦将应用程序部署到 Linux 上就会发生。有问题的代码如下。

    public static string ImageToBase64(string filePath)

    {

        System.Diagnostics.Debug.WriteLine($"File Path for Image: {filePath}");

        string base64String;

        using (var image = Image.FromFile(Path.GetFullPath(filePath)))

        {

            using (var ms = new MemoryStream())

            {

                image.Save(ms, image.RawFormat);

                image.Dispose();

                byte[] imageBytes = ms.ToArray();

                base64String = Convert.ToBase64String(imageBytes);

                imageBytes = null;

                ms.Dispose();

            }

        }

        GC.Collect();

        return base64String;

    }

编辑

我还尝试使用带位图的文件流。

    public static string ImageToBase64(string filePath)

    {

        string base64String;

        using(var fs = new FileStream(filePath,FileMode.Open))

        using (var image = new Bitmap(fs))

        {

            using (var ms = new MemoryStream())

            {

                image.Save(ms, ImageFormat.Png);

                image.Dispose();

                byte[] imageBytes = ms.ToArray();

                base64String = Convert.ToBase64String(imageBytes);

                imageBytes = null;

                ms.Dispose();

            }

        }

        GC.Collect();

        return base64String;

    }

这会引发以下异常：

抛出异常：System.Drawing.Common.dll 中的“System.ArgumentException”：“图像格式未知。” 堆栈跟踪：

在 System.Drawing.Image.InitializeFromStream（流流） 在 System.Drawing.Bitmap..ctor（流流）

Answer 1

虽然我仍然不确定为什么 Image.FromFile 和使用 Bitmap 不起作用，但我设法通过使用SixLabors的ImageSharp使其工作。工作代码如下。    public static string ImageToBase64(string filePath)    {        string base64String;        using (var image = SixLabors.ImageSharp.Image.Load(filePath))        {            using (var ms = new MemoryStream())            {                image.Save(ms, new PngEncoder());                image.Dispose();                byte[] imageBytes = ms.ToArray();                base64String = Convert.ToBase64String(imageBytes);                imageBytes = null;                ms.Dispose();            }        }        GC.Collect();        return base64String;    }

Answer 2

我在尝试访问 64 字节的 png 文件时收到此错误消息。当我用 paint 保存与 32byte png 相同的文件时，问题就解决了。

Answer 3

我可以为您提供我使用的扩展程序，希望对您有所帮助：public static string Image2Base64(string xPath){    //PNG TO BASE64             byte[] bytes = File.ReadAllBytes(xPath); //READ BYTES    if (bytes == null) return null;    //CONVERT BASE64    return Convert.ToBase64String(bytes);}如果你仍然有问题，你的 base64string 有问题。用这个验证它：base64字符串的图像(.png) 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