UrlMapping Class


Maps a URL that is displayed to users to the URL of a page in your Web application. This class cannot be inherited.

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


public sealed class UrlMapping : ConfigurationElement

System_CAPS_pubmethodUrlMapping(String, String)

Initializes a new instance of the UrlMapping class.


Gets a reference to the top-level Configuration instance that represents the configuration hierarchy that the current ConfigurationElement instance belongs to.(Inherited from ConfigurationElement.)


Gets an ElementInformation object that contains the non-customizable information and functionality of the ConfigurationElement object. (Inherited from ConfigurationElement.)


Gets the ConfigurationElementProperty object that represents the ConfigurationElement object itself.(Inherited from ConfigurationElement.)


Gets or sets a property or attribute of this configuration element.(Inherited from ConfigurationElement.)


Gets or sets a property, attribute, or child element of this configuration element.(Inherited from ConfigurationElement.)


Gets the collection of locked attributes.(Inherited from ConfigurationElement.)


Gets the collection of locked elements.(Inherited from ConfigurationElement.)


Gets the collection of locked attributes (Inherited from ConfigurationElement.)


Gets the collection of locked elements.(Inherited from ConfigurationElement.)


Gets or sets a value indicating whether the element is locked.(Inherited from ConfigurationElement.)


A URL in your Web application.


Gets the collection of properties.(Inherited from ConfigurationElement.)


Gets the URL that is displayed to the user.

System_CAPS_protmethodDeserializeElement(XmlReader, Boolean)

Reads XML from the configuration file.(Inherited from ConfigurationElement.)


Compares the current ConfigurationElement instance to the specified object.(Inherited from ConfigurationElement.)


Gets a unique value representing the current ConfigurationElement instance.(Inherited from ConfigurationElement.)


Gets the Type of the current instance.(Inherited from Object.)


Sets the ConfigurationElement object to its initial state.(Inherited from ConfigurationElement.)


Used to initialize a default set of values for the ConfigurationElement object.(Inherited from ConfigurationElement.)


Indicates whether this configuration element has been modified since it was last saved or loaded, when implemented in a derived class.(Inherited from ConfigurationElement.)


Gets a value indicating whether the ConfigurationElement object is read-only.(Inherited from ConfigurationElement.)


Resets the internal state of the ConfigurationElement object, including the locks and the properties collections.(Inherited from ConfigurationElement.)


Resets the value of the IsModified method to false when implemented in a derived class.(Inherited from ConfigurationElement.)

System_CAPS_protmethodSerializeElement(XmlWriter, Boolean)

Writes the contents of this configuration element to the configuration file when implemented in a derived class.(Inherited from ConfigurationElement.)

System_CAPS_protmethodSerializeToXmlElement(XmlWriter, String)

Writes the outer tags of this configuration element to the configuration file when implemented in a derived class.(Inherited from ConfigurationElement.)


Sets the IsReadOnly property for the ConfigurationElement object and all subelements.(Inherited from ConfigurationElement.)


Returns a string that represents the current object.(Inherited from Object.)

System_CAPS_protmethodUnmerge(ConfigurationElement, ConfigurationElement, ConfigurationSaveMode)

Modifies the ConfigurationElement object to remove all values that should not be saved. (Inherited from ConfigurationElement.)

The UrlMapping class allows you to map a URL that is displayed to users to a URL that exists in your Web application. Adding a UrlMapping object to a UrlMappingCollection is the programmatic equivalent to including an add element in the urlMappings section of a configuration file.

Each UrlMapping object contains two properties identifying a URL. One property specifies the URL shown to the user; the other specifies a URL in your Web application. Trailing white-space characters are ignored in both the Url and MappedUrl properties.


The UrlMapping property can write information into the related section of the configuration file according to the restrictions defined by the section property AllowDefinition whose value is MachineToApplication. Any attempt to write in a configuration file at a level not allowed in the hierarchy will result in an error message generated by the parser. However, you can use this class to read configuration information at any level in the hierarchy.

The following example uses the UrlMappingsSection of the Web.config file to map two URLs, and adds a mapping for an additional URL. When you modify and save the Web.config file, your application restarts.

<%@ Page Language="C#" %>
<%@ Import Namespace="System.Web.Configuration" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 

<script runat="server">
    int showVal = 0;

    protected void Page_Load(object sender, EventArgs e)
        // Get the parameter value from the QueryString
        if (Request.Params["show"] != null)
            showVal = Int32.Parse(Request.Params["show"]);

        // Show a page depending on the parameter value
        NoShowPanel.Visible = (showVal == 0);
        ShowHomePage.Visible = (showVal == 1);
        ShowProductsPage.Visible = (showVal == 2);
        ShowEventsPage.Visible = (showVal == 3);

        UrlMapping urlMap = null;

        // Open Web.config
        Configuration config =
        // Get the UrlMappings section
        UrlMappingsSection urlMapSection =

        // Modify UrlMapping in Web.config first time through
        if (!Page.IsPostBack)
            // If not already added, add a UrlMapping to the section
            if (urlMapSection.UrlMappings.Count == 2)
                urlMap = new UrlMapping("~/events.aspx", 

                // This line assumes permission to write to disk

        if (showVal > 0)
            urlMap = (UrlMapping)urlMapSection.UrlMappings[showVal - 1];
            realURL.Text = urlMap.MappedUrl;


<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>UrlMapping Example</title>
    <form id="form1" runat="server">

    <asp:Panel ID="NoShowPanel" runat="server" Visible="true">
        <h2>Show no page</h2>
        <p><a href="home.aspx">Home.aspx</a></p>
        <p><a href="products.aspx">Products.aspx</a></p>
        <p><a href="events.aspx">Events.aspx</a></p>
    <asp:Panel ID="ShowHomePage" runat="server" Visible="false">
        <h2>Home Page</h2>
        <p><a href="products.aspx">Products.aspx</a></p>
        <p><a href="events.aspx">Events.aspx</a></p>
    <asp:Panel ID="ShowProductsPage" runat="server" Visible="false">
        <h2>Products Page</h2>
        <p><a href="home.aspx">Home.aspx</a></p>
        <p><a href="events.aspx">Events.aspx</a></p>
    <asp:Panel ID="ShowEventsPage" runat="server" Visible="false">
        <h2>Events Page</h2>
        <p><a href="home.aspx">Home.aspx</a></p>
        <p><a href="products.aspx">Products.aspx</a></p>
    <p>The real URL for this page is 
        <asp:Label ID="realURL" runat="server">[None]</asp:Label></p>


.NET Framework
Available since 2.0

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

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