在SQL SERVER中建立这样结构的一个表：
==============================================================================================using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Drawing;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;
using System.Data.SqlClient;
using System.IO;
public partial class ChangeImageSize : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
private int width;
private int height;
private Bitmap newpic, savepic;
private float k1, k2;
/// <summary>
/// 构造函数
/// </summary>
public ChangeImageSize()
{
}
/// <summary>
/// 传入一张图片，并设定它的大小
/// </summary>
/// <param name="TheImage">传入的图片对象</param>
/// <param name="TheWidth">图片宽的范围</param>
/// <param name="TheHeight">图片长的范围</param>
/// <param name="path">保存的文件名和路径</param>
public Bitmap ChangePicMethod(object TheImage, int TheWidth, int TheHeight)
{
newpic = new Bitmap((System.Drawing.Image)TheImage);
this.width = newpic.Width;
this.height = newpic.Height;
k1 = (float)width / (float)TheWidth;
k2 = (float)height / (float)TheHeight;
if (k1 > k2)
{
this.width = (int)(width / k1);
this.height = (int)(height / k1);
}
else
{
this.width = (int)(width / k2);
this.height = (int)(height / k2);
}
savepic = new Bitmap(newpic, width, height);
return savepic;
//savepic.Save(@path);
}
/// <summary>
/// 保存图片到数据库
/// </summary>
/// <returns></returns>
private bool StoreImage()
{
bool rs = false;
Stream imgdatastream = this.FileUpload1.PostedFile.InputStream;
int imgdatalen = this.FileUpload1.PostedFile.ContentLength;
string imgtype = this.FileUpload1.PostedFile.ContentType;
string imgtitle =FileUpload1.PostedFile.FileName;
// byte[] imgdata = new byte[imgdatalen];
//int n = imgdatastream.Read(imgdata, 0, imgdatalen);
//Bitmap bp = ChangePicToSaveMethod(imgdatastream, 200, 200);
MemoryStream ms = new MemoryStream();
Bitmap bp = new Bitmap(imgdatastream);
bp = ChangePicMethod(bp, 200, 200);
//bp=bp.GetThumbnailImage(200,200,new System.Drawing.Image.GetThumbnailImageAbort(aa()) ,System.IntPtr.Zero);
bp.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
ms.Flush();
byte[] imgdata = ms.GetBuffer();
ms.Close();
SqlConnection connection = Connection.getConnection();
SqlCommand command = new SqlCommand("INSERT INTO ImageStore(ImageTitle,ImageType,ImageData)VALUES ( @imgtitle, @imgtype,@imgdata )", connection);
SqlParameter paramTitle = new SqlParameter("@imgtitle", SqlDbType.VarChar, 50);
paramTitle.Value = imgtitle;
command.Parameters.Add(paramTitle);
SqlParameter paramData = new SqlParameter("@imgdata", SqlDbType.Image);
paramData.Value = imgdata;
command.Parameters.Add(paramData);
SqlParameter paramType = new SqlParameter("@imgtype", SqlDbType.VarChar, 50);
paramType.Value = imgtype;
command.Parameters.Add(paramType);
connection.Open();
int numRowsAffected = command.ExecuteNonQuery();
connection.Close();
rs = true;
return rs;
}
/// <summary>
/// 从数据库取出图片
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void GetImage(string imgid)
{
string sql = "SELECT ImageData, ImageType FROM ImageStore WHERE ID = " + imgid;
SqlConnection connection = Connection.getConnection();
SqlCommand command = new SqlCommand(sql, connection);
connection.Open();
SqlDataReader dr = command.ExecuteReader();
if (dr.Read())
{
Response.ContentType = dr["ImageType"].ToString();
Response.BinaryWrite((byte[])dr["ImageData"]);
}
connection.Close();
}
}
