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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