c# - 如何将 Bitmap 转换为 Base64 字符串？

Question

我正在 try catch 屏幕，然后将其转换为 Base64 字符串。这是我的代码:

Rectangle bounds = Screen.GetBounds(Point.Empty);
Bitmap bitmap = new Bitmap(bounds.Width, bounds.Height);

using (Graphics g = Graphics.FromImage(bitmap))
{
   g.CopyFromScreen(Point.Empty, Point.Empty, bounds.Size);
}

// Convert the image to byte[]
System.IO.MemoryStream stream = new System.IO.MemoryStream();
bitmap.Save(stream, System.Drawing.Imaging.ImageFormat.Bmp);
byte[] imageBytes = stream.ToArray();

// Write the bytes (as a string) to the textbox
richTextBox1.Text = System.Text.Encoding.UTF8.GetString(imageBytes);

// Convert byte[] to Base64 String
string base64String = Convert.ToBase64String(imageBytes);

使用richTextBox调试，显示:

BM6�~

因此由于某些原因，字节不正确导致 base64String 变为空。知道我做错了什么吗？谢谢。

Answer 1

我找到了解决问题的方法:

Bitmap bImage = newImage;  // Your Bitmap Image
System.IO.MemoryStream ms = new MemoryStream();
bImage.Save(ms, ImageFormat.Jpeg);
byte[] byteImage = ms.ToArray();
var SigBase64= Convert.ToBase64String(byteImage); // Get Base64