把存储在数据库中的图片根据自己的需要的大小显示出来_.NET教程

数据|数据库|显示

    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>

把存储在数据库中的图片根据自己的需要的大小显示出来_.NET教程_编程技术