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出来
2018-09-06 12:53
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 _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 _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=202height=150width=150>
</body>
</html>