Byte[]与图片互相转换，保存到本地

//图片路径转换为byte[]

public byte[] GetPictureData(string imagePath)

{

FileStream fs = new FileStream(imagePath, FileMode.Open);

byte[] byteData = new byte[fs.Length];

fs.Read(byteData, 0, byteData.Length);

fs.Close();

return byteData;

}

//byte[]格式转为图片

public static Image BytesToImage(byte[] bytes)

{

MemoryStream ms = new MemoryStream(bytes);

Image img = Image.FromStream(ms);

return img;

}

示例：

string picpath = Server.MapPath("~/images/hn.jpg");

byte[] photo = GetPictureData(picpath); //调用方法，转换为byte[]

Image image1 = BytesToImage(photo); //byte[]转换为图片

//保存图片到本地 方法一

System.Drawing.Bitmap image = new System.Drawing.Bitmap(image1);

string imgname = DateTime.Now.ToString("yyyyMMddhhmmss") + ".jpg";

string path = "~/images/" + imgname;

image.Save(Server.MapPath(path));

this.img1.ImageUrl = path;

//保存图片到本地 方法二

string path = Server.MapPath("~/images").TrimEnd('\\') + @"\";//转为物理路径

System.IO.FileStream fs = new System.IO.FileStream(path + "123.jpg", System.IO.FileMode.Create);//注意123.jpg为你的图片名称

System.IO.BinaryWriter bw = new System.IO.BinaryWriter(fs);

bw.Write(photo, 0, photo.Length);

fs.Flush();//数据写入图片文件

fs.Close();

示例：从数据库读取数据保存到本地照片

DataTable dt = pager.GetTableView("tmp", " 1=1 ");

for (int i = 0; i < dt.Rows.Count; i++)

{

byte[] photo = new byte[0];

string imgname = "";

if (!string.IsNullOrEmpty(dt.Rows[i]["photo"].ToString()))

{

photo = (byte[])dt.Rows[i]["photo"];//读取第一个图片的位流

int ArraySize = photo.GetUpperBound(0);//获得数据库中存储的位流数组的维度上限，用作读取流的上限

imgname = DateTime.Now.ToString("yyyyMMddhhmmss") + i + ".jpg";

//string path = Server.MapPath("~/images").TrimEnd('\\') + @"\";//项目路径转为物理路径

string path = "F:\\pic\\".TrimEnd('\\') + @"\";//物理路径

System.IO.FileStream fs = new System.IO.FileStream(path + imgname, System.IO.FileMode.Create);//注意123.jpg为你的图片名称

System.IO.BinaryWriter bw = new System.IO.BinaryWriter(fs);

bw.Write(photo, 0, photo.Length);

fs.Flush();//数据写入图片文件

fs.Close();

string sql = "insert into tmpxx(aab004,aac003,aae135,photo) values ('" + dt.Rows[i]["aab004"].ToString() + "','" + dt.Rows[i]["aac003"].ToString() + "','" + dt.Rows[i]["aae135"].ToString() + "','" + "/UploadFiles/UserIcon/2016/1025/" + imgname + "')";

int m = pager.RunSql(sql);

}

else {

string sql = "insert into tmpxx(aab004,aac003,aae135,photo) values ('" + dt.Rows[i]["aab004"].ToString() + "','" + dt.Rows[i]["aac003"].ToString() + "','" + dt.Rows[i]["aae135"].ToString() + "','')";

int m = pager.RunSql(sql);

}