default.aspx.cs

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using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

using System.Drawing;
using System.Drawing.Drawing2D;

public partial class _Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {
        Bitmap bitmap = new Bitmap(400, 150);
        Graphics g = Graphics.FromImage(bitmap);
        g.Clear(Color.White);
        Pen myPen = new Pen(Color.Blue, 2);
        g.DrawLine(myPen, 40, 40, 320, 40);
        g.DrawString("无锯齿直线", new Font("宋体", 12), new SolidBrush(Color.Red), new PointF(40,20));
        g.DrawString("有锯齿直线", new Font("宋体", 12), new SolidBrush(Color.Red), new PointF(40, 80));
        g.SmoothingMode = SmoothingMode.AntiAlias;
        g.DrawLine(myPen, 40, 100, 320, 100);
        System.IO.MemoryStream ms = new System.IO.MemoryStream();
        bitmap.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
        Response.ClearContent();
        Response.ContentType = "image/Gif";
        Response.BinaryWrite(ms.ToArray());
    }
}