[C#] base64 圖存成圖檔

邏輯大致是將base64字串轉成byte陣列再轉成stream存起來

string x = files.Replace("data:image/png;base64,", "");
// Convert Base64 String to byte[]
byte[] imageBytes = Convert.FromBase64String(x);
MemoryStream ms = new MemoryStream(imageBytes, 0, imageBytes.Length);
 
// Convert byte[] to Image
ms.Write(imageBytes, 0, imageBytes.Length);
System.Drawing.Image image = System.Drawing.Image.FromStream(ms, true);
image.Save(fileMapPath, System.Drawing.Imaging.ImageFormat.Png);