C# imgage图片转base64字符/base64字符串转图片另存成

来源：互联网发布：java 对称加密编辑：程序博客网时间：2024/04/23 22:19

//图片转为base64编码的字符串protected string ImgToBase64String(string Imagefilename){try{Bitmap bmp = new Bitmap(Imagefilename);MemoryStream ms = new MemoryStream();bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);byte[] arr = new byte[ms.Length];ms.Position = 0;ms.Read(arr, 0, (int)ms.Length);ms.Close();return Convert.ToBase64String(arr);}catch (Exception ex){return null;}}//threeebase64编码的字符串转为图片protected Bitmap Base64StringToImage(string strbase64){try{byte[] arr = Convert.FromBase64String(strbase64);MemoryStream ms = new MemoryStream(arr);Bitmap bmp = new Bitmap(ms); bmp.Save(@"d:\test.jpg", System.Drawing.Imaging.ImageFormat.Jpeg);//bmp.Save(@"d:\"test.bmp", ImageFormat.Bmp);//bmp.Save(@"d:\"test.gif", ImageFormat.Gif);//bmp.Save(@"d:\"test.png", ImageFormat.Png);ms.Close();return bmp;}catch (Exception ex){return null;}}

2: 图片直接显示

    string Base64String = "";//太长就不贴出来了            byte[] bytes = Convert.FromBase64String(Base64String);            ImageTagId.ImageUrl = "data:image/jpeg;base64," + Convert.ToBase64String(bytes);//

public System.Drawing.Image Base64ToImage(string base64String)        {            byte[] imageBytes = Convert.FromBase64String(base64String);            MemoryStream ms = new MemoryStream(imageBytes, 0, imageBytes.Length);            ms.Write(imageBytes, 0, imageBytes.Length);            System.Drawing.Image image = System.Drawing.Image.FromStream(ms, true);            return image;        }使用方法：    Base64ToImage(dd).Save(Server.MapPath("Hello.jpg"));   Image1.ImageUrl = "Hello.jpg";

4：转换成图片另存为然后图片显示出来

string dd = "";//太长就不贴出来了            var bytes = Convert.FromBase64String(dd);            using (var imageFile = new FileStream(@"d:\Hello1.jpg", FileMode.Create))            {                imageFile.Write(bytes, 0, bytes.Length);                imageFile.Flush();            }

5://直接转换存为路径下图片

    string base64Str=""/ byte[] bytes = System.Convert.FromBase64String(dd);           File.WriteAllBytes(@"d:\newfile.jpg", bytes);     string filePath = @"d:\MyImage.jpg";      File.WriteAllBytes(filePath, Convert.FromBase64String(base64Str));

6：多张base64图片转换为图片另存为

public string Base64ToImage(string upimgPath,string base64String)        {            string goodspath = Server.MapPath(upimgPath);  //用来生成文件夹            if (!Directory.Exists(goodspath))            {                Directory.CreateDirectory(goodspath);            }            var imgPath = string.Empty;            if (!string.IsNullOrEmpty(base64String))            {                var splitBase = base64String.Split(';');                foreach (var item in splitBase)                {                    string filePath = upimgPath + Guid.NewGuid() + ".jpg";// Server.MapPath(upimgPath + Guid.NewGuid() + ".jpg");                    File.WriteAllBytes(Server.MapPath(filePath), Convert.FromBase64String(item));                    imgPath += filePath + ";";                }            }            else { imgPath = ";"; }            return imgPath.TrimEnd(';');        }

使用方法:

va headimg="";

Base64ToImage("UpLoadImg/HeadImage/", headimg)

0 0