小谈c#数据库存取图片的方式

第一种方式   文件夹与数据库配合

/// <summary>/// 上传图片/// </summary>/// <param name="FUSShopURL">FileUpload对象</param>/// <param name="UpladURL">图片要放到的目录名称</param>/// <returns>如果FileUpload不为空则返回上传后的图片位置，否则返回为空字符</returns>public  static  string  uploadImage(FileUpload FUSShopURL, string UpladURL){if (FUSShopURL.HasFile){//获取当前的时间，一当作图片的名字string fileName = DateTime.Now.ToString("yyyyMMddhhmmss") + DateTime.Now.Millisecond.ToString();//获取图片的扩展名string Extent = System.IO.Path.GetExtension(FUSShopURL.PostedFile.FileName);//重命名图片fileName += Extent;//设置上传图片保存的文件夹string dir = System.Web.HttpContext.Current.Server.MapPath(UpladURL);//指定图片的路径及文件名string path = dir + "\\" + fileName;//把上传得图片保存到指定的文件加中
            FUSShopURL.PostedFile.SaveAs(path);return  fileName;}else{return "";}}

第二种方式    直接把图片的Base64String码进行存取

//选择图片private void button1_Click(object sender, EventArgs e){OpenFileDialog openfile = new OpenFileDialog();openfile.Title = "请选择客户端longin的图片";openfile.Filter = "Login图片(*.jpg;*.bmp;*png)|*.jpeg;*.jpg;*.bmp;*.png|AllFiles(*.*)|*.*";if (DialogResult.OK == openfile.ShowDialog()){try{Bitmap bmp = new Bitmap(openfile.FileName);pictureBox1.Image = bmp;pictureBox1.SizeMode = PictureBoxSizeMode.Zoom;MemoryStream ms = new MemoryStream();bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);byte[] arr = new byte[ms.Length];ms.Position = 0;ms.Read(arr, 0, (int)ms.Length);ms.Close();//直接返这个值放到数据就行了pic = Convert.ToBase64String(arr);}catch { }}}

读取的方法也很简单， pic就是我们得到的图片字符串只要我们存储到数据库里，从下面的方法里读取就可以了

//加载图片private void Form1_Load(object sender, EventArgs e){try{// pic=........这一句换成从数据库里读取就可以了//判断是否为空，为空时的不执行if (!string.IsNullOrEmpty(pic)){//直接返Base64码转成数组byte[] imageBytes = Convert.FromBase64String(pic);//读入MemoryStream对象MemoryStream memoryStream = new MemoryStream(imageBytes, 0, imageBytes.Length);memoryStream.Write(imageBytes, 0, imageBytes.Length);//转成图片Image image = Image.FromStream(memoryStream);//memoryStream.Close();//不要加上这一句否则就不对了// 将图片放置在 PictureBox 中this.pictureBox1.SizeMode = PictureBoxSizeMode.Zoom;this.pictureBox1.Image = image;}}catch { }}

第三种方式   读成二进制后进行存取

private void button1_Click(object sender, EventArgs e){OpenFileDialog openfile = new OpenFileDialog();openfile.Title = "请选择客户端longin的图片";openfile.Filter = "Login图片(*.jpg;*.bmp;*png)|*.jpeg;*.jpg;*.bmp;*.png|AllFiles(*.*)|*.*";if (DialogResult.OK == openfile.ShowDialog()){try{//读成二进制byte[] bytes = File.ReadAllBytes(openfile.FileName);//直接返这个存储到数据就行了cmd.Parameters.Add("@image", SqlDbType.Image).Value = bytes;//输出二进制  在这里把数据中取到的值放在这里byte[] bytes=(byte[])model.image;pictureBox1.Image = System.Drawing.Image.FromStream(new MemoryStream(bytes));this.pictureBox1.SizeMode = PictureBoxSizeMode.Zoom;// 如果保存成文件：File.WriteAllBytes(@"d:\text.jpg", bytes);}catch { }}}