HttpResponse Class (System.Web)

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Microsoft Visual Studio 2008/.NET Framework 3.5

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.NET Framework Class Library

HttpResponse Class

Updated: April 2009

Encapsulates HTTP-response information from an ASP.NET operation.

Namespace: System.Web
Assembly: System.Web (in System.Web.dll)

Syntax

Visual Basic (Declaration)

<AspNetHostingPermissionAttribute(SecurityAction.LinkDemand, Level := AspNetHostingPermissionLevel.Minimal)> _
Public NotInheritable Class HttpResponse

Visual Basic (Usage)

Dim instance As HttpResponse

[AspNetHostingPermissionAttribute(SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
public sealed class HttpResponse

Visual C++

[AspNetHostingPermissionAttribute(SecurityAction::LinkDemand, Level = AspNetHostingPermissionLevel::Minimal)]
public ref class HttpResponse sealed

JScript

public final class HttpResponse

Remarks

The methods and properties of the HttpResponse class are exposed through the Response property of the HttpApplication, HttpContext, Page, and UserControl classes.

The following methods of the HttpResponse class are supported only in postback scenarios and not in asynchronous postback scenarios:

Partial-page updates are enabled when you use UpdatePanel controls to update selected regions of a page instead of updating the whole page with a postback. For more information, see UpdatePanel Control Overview and Partial-Page Rendering Overview.

Topic	Location
How to: Pass Values Between ASP.NET Web Pages	Building ASP .NET Web Applications
How to: Pass Values Between ASP.NET Web Pages	Building ASP .NET Web Applications
How to: Pass Values Between ASP.NET Web Pages	Building ASP .NET Web Applications in Visual Studio
How to: Pass Values Between ASP.NET Web Pages	Building ASP .NET Web Applications in Visual Studio

Examples

The following 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 is 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 that is 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.

Visual Basic

<%@ Page Language="VB" %>
<%@ import Namespace="System.Drawing" %>
<%@ import Namespace="System.Drawing.Imaging" %>
<%@ import Namespace="System.Drawing.Drawing2D" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<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>
    <title>ASP.NET Example</title>
</head>
<body>
    <form id="form1" runat="server">
    </form>
</body>
</html>

<%@ Page Language="C#" %>
<%@ import Namespace="System.Drawing" %>
<%@ import Namespace="System.Drawing.Imaging" %>
<%@ import Namespace="System.Drawing.Drawing2D" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<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>
    <title>ASP.NET Example</title>
</head>
<body>
    <form id="form1" runat="server">
    </form>
</body>
</html>

.NET Framework Security

AspNetHostingPermission
for operating in a hosted environment. Demand value: LinkDemand. Permission value: Minimal

Inheritance Hierarchy

System..::.Object
System.Web..::.HttpResponse

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Platforms

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Version Information

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

Reference

HttpResponse Members

System.Web Namespace

Change History

Date	History	Reason
April 2009	Removed comment that incorrectly stated that this is new for the .NET Framework 3.5.	Customer feedback.

Date

History

Reason

April 2009

Removed comment that incorrectly stated that this is new for the .NET Framework 3.5.

Customer feedback.