Assembly: System.Web (in system.web.dll)
Public NotInheritable Class HttpResponse
Dim instance As HttpResponse
public sealed class HttpResponse
public ref class HttpResponse sealed
public final class HttpResponse
public final class HttpResponse
The methods and properties of the HttpResponse class are exposed through the Response property of the HttpApplication, HttpContext, Page, and UserControl classes.
The following code example draws three overlapping rectangles when the page is requested. The code begins by setting the ContentType property to image/jpeg, so that the entire page will be rendered as a JPEG image. The code then calls the Clear method to ensure that no extraneous content, including headers, are sent with this response. Next, the code sets the BufferOutput property to true so that the page is completely processed before it is sent to the requesting client. Two objects used to draw the rectangles are then created, a Bitmap and a Graphics object. The variables created in the page are used as coordinates to draw the rectangles and a string that appears inside the largest rectangle.
When the three rectangles and the string that appears inside them are drawn, the Bitmap is saved to the Stream object associated with the OutputStream property, and its format is set to JPEG. The code calls the Dispose and Dispose methods to release the resources used by the two drawing objects. Lastly, the code calls the Flush method to send the buffered response to the requesting client.
<%@ Page Language="VB" %> <%@ import Namespace="System.Drawing" %> <%@ import Namespace="System.Drawing.Imaging" %> <%@ import Namespace="System.Drawing.Drawing2D" %> <script runat="server"> Private Sub Page_Load(sender As Object, e As EventArgs) ' Set the page's content type to JPEG files ' and clear all response headers. Response.ContentType = "image/jpeg" Response.Clear() ' Buffer response so that page is sent ' after processing is complete. Response.BufferOutput = True ' Create a font style. Dim rectangleFont As New Font( _ "Arial", 10, FontStyle.Bold) ' Create integer variables. Dim height As Integer = 100 Dim width As Integer = 200 ' Create a random number generator and create ' variable values based on it. Dim r As New Random() Dim x As Integer = r.Next(75) Dim a As Integer = r.Next(155) Dim x1 As Integer = r.Next(100) ' Create a bitmap and use it to create a ' Graphics object. Dim bmp As New Bitmap( _ width, height, PixelFormat.Format24bppRgb) Dim g As Graphics = Graphics.FromImage(bmp) g.SmoothingMode = SmoothingMode.AntiAlias g.Clear(Color.LightGray) ' Use the Graphics object to draw three rectangles. g.DrawRectangle(Pens.White, 1, 1, width - 3, height - 3) g.DrawRectangle(Pens.Aquamarine, 2, 2, width - 3, height - 3) g.DrawRectangle(Pens.Black, 0, 0, width, height) ' Use the Graphics object to write a string ' on the rectangles. g.DrawString("ASP.NET Samples", rectangleFont, SystemBrushes.WindowText, New PointF(10, 40)) ' Apply color to two of the rectangles. g.FillRectangle( _ New SolidBrush( _ Color.FromArgb(a, 255, 128, 255)), _ x, 20, 100, 50) g.FillRectangle( _ New LinearGradientBrush( _ New Point(x, 10), _ New Point(x1 + 75, 50 + 30), _ Color.FromArgb(128, 0, 0, 128), _ Color.FromArgb(255, 255, 255, 240)), _ x1, 50, 75, 30) ' Save the bitmap to the response stream and ' convert it to JPEG format. bmp.Save(Response.OutputStream, ImageFormat.Jpeg) ' Release memory used by the Graphics object ' and the bitmap. g.Dispose() bmp.Dispose() ' Send the output to the client. Response.Flush() End Sub 'Page_Load </script> <html> <head> </head> <body> <form runat="server"> </form> </body> </html>
<%@ Page Language="C#" %> <%@ import Namespace="System.Drawing" %> <%@ import Namespace="System.Drawing.Imaging" %> <%@ import Namespace="System.Drawing.Drawing2D" %> <script runat="server"> private void Page_Load(object sender, EventArgs e) { // Set the page's content type to JPEG files // and clear all response headers. Response.ContentType = "image/jpeg"; Response.Clear(); // Buffer response so that page is sent // after processing is complete. Response.BufferOutput = true; // Create a font style. Font rectangleFont = new Font( "Arial", 10, FontStyle.Bold); // Create integer variables. int height = 100; int width = 200; // Create a random number generator and create // variable values based on it. Random r = new Random(); int x = r.Next(75); int a = r.Next(155); int x1 = r.Next(100); // Create a bitmap and use it to create a // Graphics object. Bitmap bmp = new Bitmap( width, height, PixelFormat.Format24bppRgb); Graphics g = Graphics.FromImage(bmp); g.SmoothingMode = SmoothingMode.AntiAlias; g.Clear(Color.LightGray); // Use the Graphics object to draw three rectangles. g.DrawRectangle(Pens.White, 1, 1, width-3, height-3); g.DrawRectangle(Pens.Aquamarine, 2, 2, width-3, height-3); g.DrawRectangle(Pens.Black, 0, 0, width, height); // Use the Graphics object to write a string // on the rectangles. g.DrawString( "ASP.NET Samples", rectangleFont, SystemBrushes.WindowText, new PointF(10, 40)); // Apply color to two of the rectangles. g.FillRectangle( new SolidBrush( Color.FromArgb(a, 255, 128, 255)), x, 20, 100, 50); g.FillRectangle( new LinearGradientBrush( new Point(x, 10), new Point(x1 + 75, 50 + 30), Color.FromArgb(128, 0, 0, 128), Color.FromArgb(255, 255, 255, 240)), x1, 50, 75, 30); // Save the bitmap to the response stream and // convert it to JPEG format. bmp.Save(Response.OutputStream, ImageFormat.Jpeg); // Release memory used by the Graphics object // and the bitmap. g.Dispose(); bmp.Dispose(); // Send the output to the client. Response.Flush(); } </script> <html> <head> </head> <body> <form runat="server"> </form> </body> </html>
System.Web.HttpResponse
Windows 98, Windows 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.