TagPrefixInfo Class
Definition
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Defines a configuration element containing tag-related information.
public ref class TagPrefixInfo sealed : System::Configuration::ConfigurationElement
public sealed class TagPrefixInfo : System.Configuration.ConfigurationElement
type TagPrefixInfo = class
inherit ConfigurationElement
Public NotInheritable Class TagPrefixInfo
Inherits ConfigurationElement
- Inheritance
Examples
This example demonstrates how to specify values declaratively for several attributes of the controls
section, which can also be accessed as members of the TagPrefixInfo class.
<system.web>
<pages>
<controls>
<!-- Searches all linked assemblies for the namespace -->
<add tagPrefix="MyTags1" namespace=" MyNameSpace "/>
<!-- Uses a specified assembly -->
<add tagPrefix="MyTags2" namespace="MyNameSpace"
assembly="MyAssembly"/>
<!-- Uses the specified source for the user control -->
<add tagprefix="MyTags3" tagname="MyCtrl" src="MyControl.ascx"/>
</controls>
</pages>
</system.web>
The following code example shows how to use the TagPrefixInfo class to programmatically modify tag prefix settings. This code example is part of a larger example provided for the PagesSection class.
// Get all current Controls in the collection.
for (int i = 0; i < pagesSection.Controls.Count; i++)
{
Console.WriteLine("Control {0}:", i);
Console.WriteLine(" TagPrefix = '{0}' ",
pagesSection.Controls[i].TagPrefix);
Console.WriteLine(" TagName = '{0}' ",
pagesSection.Controls[i].TagName);
Console.WriteLine(" Source = '{0}' ",
pagesSection.Controls[i].Source);
Console.WriteLine(" Namespace = '{0}' ",
pagesSection.Controls[i].Namespace);
Console.WriteLine(" Assembly = '{0}' ",
pagesSection.Controls[i].Assembly);
}
// Create a new TagPrefixInfo object.
System.Web.Configuration.TagPrefixInfo tagPrefixInfo =
new System.Web.Configuration.TagPrefixInfo("MyCtrl", "MyNameSpace", "MyAssembly", "MyControl", "MyControl.ascx");
// Execute the Add Method.
pagesSection.Controls.Add(tagPrefixInfo);
// Add a TagPrefixInfo object using a constructor.
pagesSection.Controls.Add(
new System.Web.Configuration.TagPrefixInfo(
"MyCtrl", "MyNameSpace", "MyAssembly", "MyControl",
"MyControl.ascx"));
' Get all current Controls in the collection.
Dim j As Int32
For j = 0 To pagesSection.Controls.Count - 1
Console.WriteLine("Control {0}:", j)
Console.WriteLine(" TagPrefix = '{0}' ", _
pagesSection.Controls(j).TagPrefix)
Console.WriteLine(" TagName = '{0}' ", _
pagesSection.Controls(j).TagName)
Console.WriteLine(" Source = '{0}' ", _
pagesSection.Controls(j).Source)
Console.WriteLine(" Namespace = '{0}' ", _
pagesSection.Controls(j).Namespace)
Console.WriteLine(" Assembly = '{0}' ", _
pagesSection.Controls(j).Assembly)
Next
' Create a new TagPrefixInfo object.
Dim tagPrefixInfo As System.Web.Configuration.TagPrefixInfo = _
New System.Web.Configuration.TagPrefixInfo("MyCtrl", "MyNameSpace", "MyAssembly", "MyControl", "MyControl.ascx")
' Execute the Add Method.
pagesSection.Controls.Add(tagPrefixInfo)
' Add a TagPrefixInfo object using a constructor.
pagesSection.Controls.Add( _
New System.Web.Configuration.TagPrefixInfo( _
"MyCtrl", "MyNameSpace", "MyAssembly", "MyControl", _
"MyControl.ascx"))
Remarks
The TagPrefixInfo class allows you to programmatically access and modify tag-prefix information stored in a configuration file. It provides the same functionality as the ASP.NET @Register
directive. Tag prefixes associate a "namespace" in ASP.NET to the assemblies and namespaces that must be included for custom controls and user controls to work properly. TagPrefixInfo objects are stored as members of a TagPrefixCollection object. The TagPrefixCollection class allows you to programmatically access and modify the controls
subsection of the pages
section of a configuration file.
TagPrefixInfo objects are added to the collection using the add
element and specifying a value for the tagPrefix
attribute along with values for other relevant attributes. The other required information varies based on the kind of control you will use with the specified tag prefix:
If it is a user control, you must define the TagPrefix, TagName, and Source properties.
If it is a custom control, you must define the TagPrefix, Namespace, and Assembly properties. The Assembly property is not required if the control is in the application code directory.
The same tagPrefix
value can be used to map to multiple assemblies or namespaces.
Note
When a source is specified, the user control itself must not be in the same directory as the page. If it is, you get a run-time error when you attempt to load the page.
Constructors
TagPrefixInfo(String, String, String, String, String) |
Initializes a new instance of the TagPrefixInfo class using the passed values. |
Properties
Assembly |
Gets or sets the name of the assembly containing the control implementation. |
CurrentConfiguration |
Gets a reference to the top-level Configuration instance that represents the configuration hierarchy that the current ConfigurationElement instance belongs to. (Inherited from ConfigurationElement) |
ElementInformation |
Gets an ElementInformation object that contains the non-customizable information and functionality of the ConfigurationElement object. (Inherited from ConfigurationElement) |
ElementProperty |
Gets the ConfigurationElementProperty object that represents the ConfigurationElement object itself. (Inherited from ConfigurationElement) |
EvaluationContext |
Gets the ContextInformation object for the ConfigurationElement object. (Inherited from ConfigurationElement) |
HasContext |
Gets a value that indicates whether the CurrentConfiguration property is |
Item[ConfigurationProperty] |
Gets or sets a property or attribute of this configuration element. (Inherited from ConfigurationElement) |
Item[String] |
Gets or sets a property, attribute, or child element of this configuration element. (Inherited from ConfigurationElement) |
LockAllAttributesExcept |
Gets the collection of locked attributes. (Inherited from ConfigurationElement) |
LockAllElementsExcept |
Gets the collection of locked elements. (Inherited from ConfigurationElement) |
LockAttributes |
Gets the collection of locked attributes. (Inherited from ConfigurationElement) |
LockElements |
Gets the collection of locked elements. (Inherited from ConfigurationElement) |
LockItem |
Gets or sets a value indicating whether the element is locked. (Inherited from ConfigurationElement) |
Namespace |
Gets or sets the namespace in which the control resides. |
Properties |
Gets the collection of properties. (Inherited from ConfigurationElement) |
Source |
Gets or sets the name and path of the file containing the user control. |
TagName |
Gets or sets the name of the user control. |
TagPrefix |
Gets or sets the tag prefix that is being associated with a source file or namespace and assembly. |
Methods
DeserializeElement(XmlReader, Boolean) |
Reads XML from the configuration file. (Inherited from ConfigurationElement) |
Equals(Object) |
Compares this instance to another object. |
GetHashCode() |
Returns a hash value for the current instance. |
GetTransformedAssemblyString(String) |
Returns the transformed version of the specified assembly name. (Inherited from ConfigurationElement) |
GetTransformedTypeString(String) |
Returns the transformed version of the specified type name. (Inherited from ConfigurationElement) |
GetType() |
Gets the Type of the current instance. (Inherited from Object) |
Init() |
Sets the ConfigurationElement object to its initial state. (Inherited from ConfigurationElement) |
InitializeDefault() |
Used to initialize a default set of values for the ConfigurationElement object. (Inherited from ConfigurationElement) |
IsModified() |
Indicates whether this configuration element has been modified since it was last saved or loaded, when implemented in a derived class. (Inherited from ConfigurationElement) |
IsReadOnly() |
Gets a value indicating whether the ConfigurationElement object is read-only. (Inherited from ConfigurationElement) |
ListErrors(IList) |
Adds the invalid-property errors in this ConfigurationElement object, and in all subelements, to the passed list. (Inherited from ConfigurationElement) |
MemberwiseClone() |
Creates a shallow copy of the current Object. (Inherited from Object) |
OnDeserializeUnrecognizedAttribute(String, String) |
Gets a value indicating whether an unknown attribute is encountered during deserialization. (Inherited from ConfigurationElement) |
OnDeserializeUnrecognizedElement(String, XmlReader) |
Gets a value indicating whether an unknown element is encountered during deserialization. (Inherited from ConfigurationElement) |
OnRequiredPropertyNotFound(String) |
Throws an exception when a required property is not found. (Inherited from ConfigurationElement) |
PostDeserialize() |
Called after deserialization. (Inherited from ConfigurationElement) |
PreSerialize(XmlWriter) |
Called before serialization. (Inherited from ConfigurationElement) |
Reset(ConfigurationElement) |
Resets the internal state of the ConfigurationElement object, including the locks and the properties collections. (Inherited from ConfigurationElement) |
ResetModified() |
Resets the value of the IsModified() method to |
SerializeElement(XmlWriter, Boolean) |
Writes the contents of this configuration element to the configuration file when implemented in a derived class. (Inherited from ConfigurationElement) |
SerializeToXmlElement(XmlWriter, String) |
Writes the outer tags of this configuration element to the configuration file when implemented in a derived class. (Inherited from ConfigurationElement) |
SetPropertyValue(ConfigurationProperty, Object, Boolean) |
Sets a property to the specified value. (Inherited from ConfigurationElement) |
SetReadOnly() |
Sets the IsReadOnly() property for the ConfigurationElement object and all subelements. (Inherited from ConfigurationElement) |
ToString() |
Returns a string that represents the current object. (Inherited from Object) |
Unmerge(ConfigurationElement, ConfigurationElement, ConfigurationSaveMode) |
Modifies the ConfigurationElement object to remove all values that should not be saved. (Inherited from ConfigurationElement) |
Applies to
See also
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