我正在嘗試使用 .Net Core 2.2 將圖像讀入 Base64 格式并拋出ArgumentException：圖像格式未知。System.Drawing.Image.FromFile（字符串文件名，bool useEmbeddedColorManagement）filePath 是正確的，我已經(jīng)雙重和三次檢查文件是否存在。我試圖用大寫和小寫擴(kuò)展名命名我的 PNG。這不會(huì)在 Windows 上本地發(fā)生，但是一旦將應(yīng)用程序部署到 Linux 上就會(huì)發(fā)生。有問題的代碼如下。 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; }編輯我還嘗試使用帶位圖的文件流。 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; }這會(huì)引發(fā)以下異常：拋出異常：System.Drawing.Common.dll 中的“System.ArgumentException”：“圖像格式未知。” 堆棧跟蹤：在 System.Drawing.Image.InitializeFromStream（流流） 在 System.Drawing.Bitmap..ctor（流流）
3 回答
白板的微信
TA貢獻(xiàn)1883條經(jīng)驗(yàn) 獲得超3個(gè)贊
雖然我仍然不確定為什么 Image.FromFile 和使用 Bitmap 不起作用，但我設(shè)法通過使用SixLabors的ImageSharp使其工作。
工作代碼如下。
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;
}
aluckdog
TA貢獻(xiàn)1847條經(jīng)驗(yàn) 獲得超7個(gè)贊
我在嘗試訪問 64 字節(jié)的 png 文件時(shí)收到此錯(cuò)誤消息。當(dāng)我用 paint 保存與 32byte png 相同的文件時(shí)，問題就解決了。
牧羊人nacy
TA貢獻(xiàn)1862條經(jīng)驗(yàn) 獲得超7個(gè)贊
我可以為您提供我使用的擴(kuò)展程序，希望對(duì)您有所幫助：
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);
}
如果你仍然有問題，你的 base64string 有問題。用這個(gè)驗(yàn)證它：
base64字符串的圖像(.png) =
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