using System.Drawing;
Image img = Image.FromFile(@"图片地址");
Graphics g = Graphics.FromImage(img);
g.DrawString("ojlovecd", new Font(new FontFamily("宋体"), 120f), new SolidBrush(Color.Blue), new PointF(500, 400));
img.Save("E:\\test.png", System.Drawing.Imaging.ImageFormat.Png);
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