private void getWebPicture_Click(object sender, EventArgs e)
{
WebRequest request = WebRequest.Create("http://d.hiphotos.baidu.com/image/h%3D200/sign=6008b360f336afc3110c38658318eb85/a1ec08fa513d26973aa9f6fd51fbb2fb4316d81c.jpg");
WebResponse response = request.GetResponse();
Stream s=response.GetResponseStream();
byte[] data = new byte[1024];
int length = 0;
MemoryStream ms = new MemoryStream();
while ((length=s.Read(data,0,data.Length))>0)
{
ms.Write(data, 0, length);
}
ms.Seek(0, SeekOrigin.Begin);
pictureBox1.Image = Image.FromStream(ms);
}
byte[]数组转换成Image:
private byte[] ImageTobyteshuzu(Image image)
{
MemoryStream ms = new MemoryStream();
Bitmap bi = new Bitmap(image);
bi.Save(ms, image.RawFormat);
byte[] data = new byte[ms.Length];
ms.Seek(0, SeekOrigin.Begin);
ms.Read(data, 0, data.Length);
return data;
}
Image转换成byte[]数组:
private Image byteshuzuToImage(byte[] imageBytes)
{
MemoryStream ms = new MemoryStream();
ms.Write(imageBytes, 0, imageBytes.Length);
ms.Seek(0, SeekOrigin.Begin);
Image i = Image.FromStream(ms);
return i;
}
最后说一下,使用了memeoryStream的write和read方法以后,最好一定要把流指针回到最开始的地方!!! 我因为这个问题老是转换失败,困扰了很久!!! 写这篇博客,以便巩固。
wpf:将iv1上获取到的网络图片存到数据库,并从数据库中读取并显示到Image上:
private void Button_Click_2(object sender, RoutedEventArgs e)
{
if (iv1.Source!=null)
{
BitmapImage bi = (BitmapImage)iv1.Source;
Stream s=bi.StreamSource;
s.Seek(0, SeekOrigin.Begin);
byte[] data = new byte[s.Length];
s.Read(data, 0, data.Length);
saveImageToSqlServer(data);
getImageFromSqlServer();
}
else
{
MessageBox.Show("请先获取图片!");
}
}
保存到数据库:
private void saveImageToSqlServer(byte[] data)
{
SqlConnection conn = new SqlConnection(connectString);
conn.Open();
SqlCommand comm = new SqlCommand();
comm.Connection = conn;
comm.CommandText = "delete from tb1";
comm.ExecuteNonQuery();
comm.Connection = conn;
comm.CommandText = "insert into tb1(Image) values(@Image)";//注意这里要加@Image
comm.Parameters.Add("@Image", System.Data.SqlDbType.Image,data.Length);
comm.Parameters[0].Value = data;
comm.ExecuteNonQuery();
conn.Close();
}
从数据库中读取:
private void getImageFromSqlServer()
{
SqlDataAdapter sda = new SqlDataAdapter("select * from tb1", connectString);
DataTable dt = new DataTable();
sda.Fill(dt);
byte[] data = (byte[])dt.Rows[0][1];
MemoryStream ms = new MemoryStream();
ms.Write(data, 0, data.Length);
ms.Seek(0, SeekOrigin.Begin);
BitmapImage bi = new BitmapImage();
bi.BeginInit();
bi.StreamSource = ms;
bi.EndInit();
iv2.Source = bi;
}
获取网络图片并显示在picturbox上,byte[]数组转换成Image
原文：https://www.cnblogs.com/macT/p/11579434.html