c#在sql中存取圖片image示例

更新時間：2014年03月12日 16:03:36 作者：

這篇文章主要介紹了c#在sql中存取圖片image示例,需要的朋友可以參考下

（1）控制臺應用程序下演示插入圖片

public void InsertIMG()
{
//將需要存儲的圖片讀取為數(shù)據(jù)流
FileStream fs = new FileStream(@"E:\c.jpg", FileMode.Open,FileAccess.Read);
Byte[] btye2 = new byte[fs.Length];
fs.Read(btye2 , 0, Convert.ToInt32(fs.Length));
fs.Close();

using (SqlConnection conn = new SqlConnection(sqlconnstr))
{
conn.Open();
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
cmd.CommandText = "insert into T_Img(imgfile) values(@imgfile)";
SqlParameter par = new SqlParameter("@imgfile", SqlDbType.Image);
par.Value = bt;
cmd.Parameters.Add(par);

int t=(int)(cmd.ExecuteNonQuery());
if (t > 0)
{
Console.WriteLine("插入成功");
}
conn.Close();
}
}

（2）控制臺應用程序下讀出并生成圖片到物理位置

復制代碼代碼如下:

public void Read()
{
byte[] MyData = new byte[0];
using (SqlConnection conn = new SqlConnection(sqlconnstr))
{
conn.Open();
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
cmd.CommandText = "select * from T_img";
SqlDataReader sdr = cmd.ExecuteReader();
sdr.Read();
MyData = (byte[])sdr["ImgFile"];//讀取第一個圖片的位流
int ArraySize= MyData.GetUpperBound(0);//獲得數(shù)據(jù)庫中存儲的位流數(shù)組的維度上限，用作讀取流的上限

FileStream fs = new FileStream(@"c:\00.jpg", FileMode.OpenOrCreate, FileAccess.Write);
fs.Write(MyData, 0, ArraySize);
fs.Close(); //-- 寫入到c:\00.jpg。
conn.Close();
Console.WriteLine("讀取成功");//查看硬盤上的文件
}
}

（3）Web下picshow.aspx頁將圖片讀取出來并寫入到瀏覽器上呈現(xiàn)

復制代碼代碼如下:

public void Read()
{
byte[] MyData = new byte[0];
using (SqlConnection conn = new SqlConnection(sqlconnstr))
{
conn.Open();
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
cmd.CommandText = "select * from T_img";
SqlDataReader sdr = cmd.ExecuteReader();
sdr.Read();
MyData = (byte[])sdr["ImgFile"];
Response.ContentType = "image/gif";
Response.BinaryWrite(MyData);
conn.Close();
Response.Write("讀取成功");
}

（4）在web中可以如上picshow.aspx頁面讀取并顯示圖片，而真正引用該圖片時如下示例

復制代碼代碼如下:

（5）Winform下將圖片寫入到sql數(shù)據(jù)庫image類型字段中的方法和以上方法基本一致，僅區(qū)別于可以利用多個對話框來幫助選取存儲圖片等，各個屬性可以方便的利用上

（6）Winform下讀取圖片在picturebox控件中顯示出來

方法一：利用MemoryStream 和System.Drawing.Image

復制代碼代碼如下:

public void Read()
{
byte[] MyData = new byte[0];
using (SqlConnection conn = new SqlConnection(sqlconnstr))
{
conn.Open();
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
cmd.CommandText = "select * from T_img";
SqlDataReader sdr = cmd.ExecuteReader();
sdr.Read();
MyData = (byte[])sdr["ImgFile"];

MemoryStream mystream = new MemoryStream(MyData);
//用指定的數(shù)據(jù)流來創(chuàng)建一個image圖片
System.Drawing.Image img = System.Drawing.Image.FromStream(mystream, true);

System.Windows.Forms.PictureBox picbox = new PictureBox();
picbox.Image = img;
picbox.Left = 30;
picbox.Top = 80;
picbox.Width = 800;
picbox.Height = 500;
this.Controls.Add(picbox);

mystream.Close();
conn.Close();
}
}

方法二：將流直接讀取成圖片并寫入到物理位置，然后再行利用該圖片呈現(xiàn)

復制代碼代碼如下:

void Read()
{
using (SqlConnection conn = new SqlConnection(sqlconnstr))
{
conn.Open();
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
cmd.CommandText = "select * from T_img";
SqlDataReader sdr = cmd.ExecuteReader();
sdr.Read();

byte[] Image_img = (byte[])sdr["ImgFile"];
if (Image_img.Length == 0)
{
return;
}
int filelength = Image_img.Length;
string imageName = "1.jpg";
string myUrl = Environment.CurrentDirectory + "\\" + imageName;
FileStream fs = new FileStream(myUrl, FileMode.OpenOrCreate,FileAccess.Write);
BinaryWriter BW = new BinaryWriter(fs);
BW.BaseStream.Write(Image_img, 0, filelength);
BW.Flush();
BW.Close();
System.Windows.Forms.PictureBox picbox = new PictureBox();

//為picbox添加圖片方法一
//picbox.ImageLocation = myUrl;
//picbox.Width = 800;
//picbox.Height = 300;

//為picbox添加圖片方法二
Bitmap bitmap = new Bitmap(myUrl);
picbox.Width = 100;//bitmap.Width;
picbox.Height = 80;//bitmap.Height;
picbox.Image = (Image)bitmap;
picbox.SizeMode = System.Windows.Forms.PictureBoxSizeMode.StretchImage;
picbox.Left = 20;
picbox.Top = 30;

this.Controls.Add(picbox);
conn.Close();

}
}

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