把图片转换成二进制--把二进制转换成图片
private
void
button1_Click(
object
sender, EventArgs e)
{
string
path =
this
.textBox1.Text;
byte
[] imgBytesIn = SaveImage(path);
ShowImgByByte(imgBytesIn);
//Parameters.Add("@Photo", SqlDbType.Binary).Value = imgBytesIn;
}
//将图片以二进制流
public
byte
[] SaveImage(String path)
{
FileStream fs =
new
FileStream(path, FileMode.Open, FileAccess.Read);
//将图片以文件流的形式进行保存
BinaryReader br =
new
BinaryReader(fs);
byte
[] imgBytesIn = br.ReadBytes((
int
)fs.Length);
//将流读入到字节数组中
return
imgBytesIn;
}
//现实二进制流代表的图片
public
void
ShowImgByByte(
byte
[] imgBytesIn)
{
MemoryStream ms =
new
MemoryStream(imgBytesIn);
pictureBox1.Image = Image.FromStream(ms);
}
二、将图片保存到数据库中，并从数据库中读取：
#region 将图片从数据库中读取
/// <summary>
/// 将图片从数据库中读取
/// </summary>
/// <param name="xs_ID">要读取图片的学号</param>
/// <param name="ph">pictureBox1控件名</param>
public
void
get_photo(
string
xs_ID, PictureBox ph)
//将图片从数据库中读取
{
byte
[] imagebytes =
null
;
getcon();
SqlCommand con =
new
SqlCommand(
"select * from S_jiben where S_num='"
+ xs_ID +
"'"
, link);
SqlDataReader dr = con.ExecuteReader();
while
(dr.Read())
{
imagebytes =(
byte
[])dr.GetValue(18);
}
dr.Close();
con_close();
MemoryStream ms =
new
MemoryStream(imagebytes);
Bitmap bmpt =
new
Bitmap(ms);
ph.Image = bmpt;
}
#endregion
#region
public
void
SaveImage(
string
MID, OpenFileDialog openF)
//将图片以二进制存入数据库中
{
string
strimg = openF.FileName.ToString();
//记录图片的所在路径
FileStream fs =
new
FileStream(strimg, FileMode.Open, FileAccess.Read);
//将图片以文件流的形式进行保存
BinaryReader br =
new
BinaryReader(fs);
byte
[] imgBytesIn = br.ReadBytes((
int
)fs.Length);
//将流读入到字节数组中
getcon();
StringBuilder strSql =
new
StringBuilder();
strSql.Append(
"update S_jiben Set xs_photo=@Photo where S_num="
+ MID);
SqlCommand cmd =
new
SqlCommand(strSql.ToString(), link);
cmd.Parameters.Add(
"@Photo"
, SqlDbType.Binary).Value = imgBytesIn;
cmd.ExecuteNonQuery();
con_close();
}
#endregion