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CompilationMode Enum

  • Reference

Definition

Namespace:
System.Web.UI
Assembly:
System.Web.dll

Defines constants that specify how ASP.NET should compile .aspx pages and .ascx controls.

public enum class CompilationMode
public enum CompilationMode
type CompilationMode = 
Public Enum CompilationMode
Inheritance
Object
ValueType
Enum
CompilationMode

Fields

Name Value Description
Auto 0

ASP.NET will not compile the page, if possible.
Never 1

The page or control should never be dynamically compiled.
Always 2

The page should always be compiled.

Examples

The following example demonstrates how to use the CompilationMode page directive to indicate that a page should never be compiled.

<%@ Page Language="C#" compilationMode="never" %>
<%@ Import namespace="System.IO" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>CompilationMode Example</title>
</head>
<body>
<form id="Form1" runat="server">

Script blocks are not allowed on this page. 
Any server side code that requires compilation 
contained in this page would cause the page to fail
</form>
</body>
</html>

<%@ Page Language="VB" compilationMode="never" %>
<%@ Import namespace="System.IO" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title>CompilationMode Example</title>
</head>
<body>
<form id="Form1" runat="server">
Script blocks are not allowed on this page. 
Any server side code that requires compilation 
contained in this page would cause the page to fail
</form>
</body>
</html>

Remarks

The CompilationMode enumeration values indicate whether a page or control should be compiled at run time. When no compilation mode is specified, the default value is Always. Setting a page to never compile using the Never attribute increases performance by disqualifying the specified page in the compilation process. To define a page-specific CompilationMode attribute that specifies an .aspx, .ascx, or .master file should not be compiled at the page level, you can use a directive like the following:

<%@ page compilationMode="never" %>

The compilation mode can also be specified in configuration files. The PagesSection configuration section object identifies page-specific configuration settings. The pages configuration section element can be declared at the machine, site, application, and subdirectory levels of the configuration files.

If the CompilationMode is set to Never and a page contains a script block or code construct that requires compilation, ASP.NET returns with an error and the page doesn't run.

Applies to

See also