C# 将图像转换为字节[]和base64字符串

我想将图片框中的图像转换为

base64字符串

private void btnCapture_Click(object sender, EventArgs e)
    {
        frmaccount.pbID.Image = (Bitmap)pbCapture.Image.Clone();//this is the image i wanna Convert to base64
        device.Stop();
        this.Dispose();
    }

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另外，该图像是从我的相机拍摄的，我想将其保存为

base64字符串

您可以先将图像转换为

字节[]

private void btnCapture_Click(object sender, EventArgs e)
    {
        frmaccount.pbID.Image = (Bitmap)pbCapture.Image.Clone();//this is the image i wanna Convert to base64
        device.Stop();
        this.Dispose();
    }

ImageConverter converter = new ImageConverter();
var bytes = (byte[])converter.ConvertTo((Bitmap)pbCapture.Image, typeof(byte[]));

然后是base64

字符串

string base64String = Convert.ToBase64String(imageBytes);

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它是什么类型的？它有什么方法？