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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>
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