在.net下怎样画图（c#）？需要引用什么名字空间？各位高手支持啊!
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<%@ Page language="c#" Codebehind="WebGdi.aspx.cs" AutoEventWireup="false" Inherits="webgdi.WebGdi" %><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<title>WebForm1</title>
<meta name="GENERATOR" Content="Microsoft Visual Studio 7.0">
<meta name="CODE_LANGUAGE" Content="C#">
<meta name="vs_defaultClientScript" content="JavaScript">
<meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
</HEAD>
<body MS_POSITIONING="GridLayout">
<form id="Form1" method="post" runat="server">
<FONT face="宋体"></FONT>
</form>
<%
webgdi.WebGdi drawweb= new webgdi.WebGdi();
drawweb.draw();
%>
</body>
</HTML>后台：public void draw()
{
Bitmap newBitmap = new Bitmap(600,400);
Graphics g = Graphics.FromImage(newBitmap);
g.FillRectangle(new SolidBrush(Color.LightYellow), 0,0,200,200);
Point[] points = new Point[]
{
new Point(1,1),
new Point(20,20),
new Point(100,300),
new Point(80,90),
}; g.DrawLines(new Pen(Color.Red, 3.0f), points);
}结果：前台页面webgdi什么也没显示，也不提错，怎么回事?
public Stream draw()
{
Bitmap memImg = new Bitmap(100, 100, Drawing.Imaging.PixelFormat.Format24bppRgb);
Stream mystream = New MemoryStream();
Graphics g = Graphics.FromImage(memImg);
g.DrawLines(...);
memImg.Save(mystream, System.Drawing.Imaging.ImageFormat.Gif);
return mystream;
}前台：
webgdi.WebGdi drawweb= new webgdi.WebGdi();
Stream mystream = drawweb.draw();
Bitmap myimg = new Bitmap(mystream);
Response.ContentType = "image/gif";
myimg.Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Gif);OK. try it.
public Stream draw()
{
Bitmap memImg = new Bitmap(100, 100, Drawing.Imaging.PixelFormat.Format24bppRgb);
Stream mystream = New MemoryStream();
Graphics g = Graphics.FromImage(memImg);
g.DrawLines(...);
memImg.Save(mystream, System.Drawing.Imaging.ImageFormat.Gif);
return mystream;
}前台：
webgdi.WebGdi drawweb= new webgdi.WebGdi();
Stream mystream = drawweb.draw();
Bitmap myimg = new Bitmap(mystream);
Response.ContentType = "image/gif";
myimg.Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Gif);OK. try it.
CSDN的这个页面？
public Stream draw()
{
Bitmap newBitmap = new Bitmap(600,400,System.Drawing.Imaging.PixelFormat.Format24bppRgb);
Stream mystream = new MemoryStream();
Graphics g = Graphics.FromImage(newBitmap);
Point[] points = new Point[]
{
new Point(1,1),
new Point(20,20),
new Point(100,300),
new Point(80,90),
}; g.DrawLines(new Pen(Color.Red, 3.0f), points);
newBitmap.Save(mystream, System.Drawing.Imaging.ImageFormat.Gif);
return mystream;
}前台：<%
webgdi.WebGdi drawweb= new webgdi.WebGdi();
Stream mystream = drawweb.draw();
Bitmap myimg = new Bitmap(mystream);
Response.ContentType = "image/gif";
myimg.Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Gif);
%>
乱码：
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也许是Response不同，建议你还是用CodeBehind的方式吧。