C#Base64字符串到JPEG图像

Question

我试图将Base64String转换为需要在本地保存的图像.

目前,我的代码能够保存图像,但是当我打开保存的图像时,它会显示"无效图像".

码:

try
{
    using (var imageFile = new StreamWriter(filePath))
    {
        imageFile.Write(resizeImage.Content);
        imageFile.Close();
    }
}

的Content是一个string其中包含的Base64字符串对象.

Answer 1

首先,将base 64字符串转换为a Image,然后使用该Image.Save方法.

要从base 64字符串转换为Image:

 public Image Base64ToImage(string base64String)
 {
    // Convert base 64 string to byte[]
    byte[] imageBytes = Convert.FromBase64String(base64String);
    // Convert byte[] to Image
    using (var ms = new MemoryStream(imageBytes, 0, imageBytes.Length))
    {
        Image image = Image.FromStream(ms, true);
        return image;
    }
 }

要转换Image为base 64字符串:

public string ImageToBase64(Image image,System.Drawing.Imaging.ImageFormat format)
{
  using (MemoryStream ms = new MemoryStream())
  {
    // Convert Image to byte[]
    image.Save(ms, format);
    byte[] imageBytes = ms.ToArray();

    // Convert byte[] to base 64 string
    string base64String = Convert.ToBase64String(imageBytes);
    return base64String;
  }
}

最后,您可以轻松调用Image.Save(filePath);以保存图像.

Answer 2

所以使用您提供的代码.

var bytes = Convert.FromBase64String(resizeImage.Content);
using (var imageFile = new FileStream(filePath, FileMode.Create))
{
    imageFile.Write(bytes ,0, bytes.Length);
    imageFile.Flush();
}

Answer 3

public Image Base64ToImage(string base64String)
{
   // Convert Base64 String to byte[]
    byte[] imageBytes = Convert.FromBase64String(base64String);
    MemoryStream ms = new MemoryStream(imageBytes, 0, imageBytes.Length);

    // Convert byte[] to Image
    ms.Write(imageBytes, 0, imageBytes.Length);
    Image image = Image.FromStream(ms, true);

    return image;
}