技术资料 > .Net专区 > 数据库应用 : 如何把存储在数据库中的图片根据自己的需要的大小显示

如何把存储在数据库中的图片根据自己的需要的大小显示

March 25,2004

文件1：showimage.aspx.cs

namespace ImageResizing {

public class MainDisplay : System.Web.UI.Page {

  public void Page_Load(System.Object sender, System.EventArgs e) {

  try {

System.Int32 _ImgID = System.Convert.ToInt32(Request.QueryString["ImgID"]);

System.Int32 _height = System.Convert.ToInt32(Request.QueryString["height"]);

System.Int32 _width = System.Convert.ToInt32(Request.QueryString["width"]);

System.Data.SqlClient.SqlConnection Con = new System.Data.SqlClient.SqlConnection( "server=localhost;database=northwind;trusted_connection=true" );

System.String SqlCmd = "SELECT * FROM Images WHERE ImageID = @ImageID";

System.Data.SqlClient.SqlCommand SqlCmdObj = new System.Data.SqlClient.SqlCommand( SqlCmd, Con );

SqlCmdObj.Parameters.Add("@ImageID", System.Data.SqlDbType.Int).Value = _ImgID;

Con.Open();

System.Data.SqlClient.SqlDataReader SqlReader = SqlCmdObj.ExecuteReader();

SqlReader.Read();

System.Web.HttpContext.Current.Response.ContentType = "image/pjpeg";

System.Drawing.Image _image = System.Drawing.Image.FromStream( new System.IO.MemoryStream( (byte[])SqlReader["Image"] ) );

System.Drawing.Image _newimage = _image.GetThumbnailImage( _width, _height, null, new System.IntPtr());

_newimage.Save( System.Web.HttpContext.Current.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg );

} catch (System.Exception Ex) {

System.Web.HttpContext.Current.Trace.Write(Ex.Message.ToString());

}

  }

}

}

文件2：显示图片之用，把querystring传入
<html>
<body>

<img src="showimage.aspx?ImgID=202&height=150&width=150">
</body>
</html>

相关链接：http://www.aspnextgen.com/tutorials.aspx?tutorialid=176