02-20 winform 上传图片并读取图片

建立一个windows窗体应用程序，在form1界面中拖入两个按钮和一个pictureBox，通过输入输出流来上传图片和显示图片。需要添加一下openFileDialog1.

界面如下：

在cs中写上传和显示图片的方法

 1  //上传图片

 2         private void button1_Click(object sender, EventArgs e)

 3         {

 4             //图片的转化

 5             openFileDialog1.Filter = "*jpg|*.jpg|*bmp|*.bmp|*gif|*.gif";//设置图片另存为文件类型格式，filter是文件筛选器

 6             DialogResult da = openFileDialog1.ShowDialog();

 7             if(da==DialogResult.OK)

 8             {

 9                 string fil = openFileDialog1.FileName;

10                 FileStream fs = new FileStream(fil,FileMode.Open,FileAccess.Read);

11                 byte[] img=new byte[fs.Length];

12                 BinaryReader br = new BinaryReader(fs);//二进制读取器

13                 img = br.ReadBytes(Convert.ToInt32(fs.Length));

14                 //链接数据库

15                SqlConnection conn = new SqlConnection("server=.;database=newData;user=sa;pwd=123");

16                conn.Open();

17                SqlCommand cmd = conn.CreateCommand();

18                cmd.CommandText = "insert into Table_1 values(@image)";

19                cmd.Parameters.Clear();

20                cmd.Parameters.Add("@image",img);

21                cmd.ExecuteNonQuery();

22                conn.Close();

23                MessageBox.Show("上传成功");

24 

25             }

上传图片的方法

 1   //从数据库中读取图片

 2         private void button2_Click(object sender, EventArgs e)

 3         {

 4             SqlConnection conn = new SqlConnection("server=.;database=newData;user=sa;pwd=123");

 5             conn.Open();

 6             SqlCommand cmd = conn.CreateCommand();

 7             cmd.CommandText = "select top 1*from Table_1";

 8             SqlDataReader dr = cmd.ExecuteReader();

 9             dr.Read();

10             byte[] img = (byte[])dr["Ino"];

11            // byte[] img1=(byte[])dr["Ino"];

12             MemoryStream ms = new MemoryStream(img,0,img.Length);

13             ms.Write(img,0,img.Length);

14             Image image = Image.FromStream(ms);

15             this.pictureBox1.SizeMode = PictureBoxSizeMode.Zoom;

16             this.pictureBox1.Image = image;

17         }

从数据库显示图片的方法