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HomeRealmDiscoveryPage Class Overview

Active Directory Federation Services 2.0

The HomeRealmDiscovery.aspx page shows a drop-down list that contains the list of trusted claims providers configured for the Active Directory® Federation Services (AD FS) 2.0 server. The code-behind class for this page derives from the HomeRealmDiscoveryPage class.

The HomeRealmDiscoveryPage class provides the ClaimsProviders property to retrieve the list of claims providers that are trusted by the core security token service. (These are the claims providers configured under Claims Provider Trusts in the AD FS 2.0 Management Console.) It also provides the Microsoft.IdentityServer.Web.UI.HomeRealmDiscoveryPage.SelectHomeRealm(System.String) method to redirect the user to the selected claims provider.

The HomeRealmDiscoveryPage class provides the Microsoft.IdentityServer.Web.UI.PassiveProtocolPage.SignIn(System.IdentityModel.Tokens.SecurityToken) method, which it inherits from the PassiveProtocolPage class, to sign the user in with a posted token.

Example: Showing Claims Providers as a List of Links

This example shows how to modify the HomeRealmDiscovery.aspx page and its code-behind class to display the list of trusted claims providers as a list of links instead of a drop-down list.

WarningWarning
We recommend that you make backup copies of the HomeRealmDiscovery.aspx and HomeRealmDiscovery.aspx.cs files before you modify them.

First, in the HomeRealmDiscovery.aspx, remove the drop-down list and the Submit button control:

<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
        <div class="GroupXLargeMargin">
            <asp:Label Text="<%$ Resources:CommonResources, HomeRealmSelectionText%>"  runat="server" />
        </div>
        <div class="GroupXXLargeMargin">
<!-- Remove this element. -->
            <asp:DropDownList ID="PassiveIdentityProvidersDropDownList" DataTextField="Name" DataValueField="Id" runat="server"></asp:DropDownList>

            <div>
<!-- Remove this element. -->
                <asp:Button runat="server" ID="PassiveSignInButton" Text="Continue to Sign In" EnableViewState="False"
                OnClick="PassiveSignInButton_Click" CssClass="Resizable"/>
            </div>
        </div>
<!-- ... -->
</asp:Content>

Next, add a Repeater control where the drop-down list used to be.

<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
    <script type="text/javascript" src="FederationPassiveJScript.js"></script>
        <div class="GroupXLargeMargin">
            The site that you are accessing requires you to sign in. Select your organization from the following list.
        </div>
        <div class="GroupXXLargeMargin">
            <div>
<!-- Add this. -->
                <asp:Repeater ID="Repeater1" runat="server" OnItemCommand="Repeater1_ItemCommand">
                    <ItemTemplate>
                        <div>
                            <asp:LinkButton ID="LinkButton1" CommandArgument='<%#DataBinder.Eval(Container.DataItem, "ID") %>'
                                runat="server"><%#DataBinder.Eval(Container.DataItem, "Name") %>
                            </asp:LinkButton>
                        </div>
                    </ItemTemplate>
                </asp:Repeater>
            </div>
        </div>
<!-- ... -->
</asp:Content>

Note that you define the ItemTemplate of the Repeater control to generate a LinkButton control. The CommandArgument of each LinkButton control takes the value of the ID column from a data binding, which you set up in the next step. The text of the link is taken from the Name column from this data binding.

Next, in the HomeRealmDiscovery.aspx.cs page, bind the Repeater control to HomeRealmDiscoveryPage.ClaimsProviders in the Page_Init event handler.

public partial class HomeRealmDiscovery : Microsoft.IdentityServer.Web.UI.HomeRealmDiscoveryPage
{
    protected void Page_Init( object sender, EventArgs e )
    {
// This was the data binding used by the drop-down list that you removed.
//        PassiveIdentityProvidersDropDownList.DataSource = base.ClaimsProviders;
//        PassiveIdentityProvidersDropDownList.DataBind();

// This is the data binding for the Repeater control.
        Repeater1.DataSource = base.ClaimsProviders;
        Repeater1.DataBind();
    }
}

Finally, remove the PassiveSignInButton_Click event handler, and add an event handler for the ItemCommand event of the Repeater control. Pass the CommandArgument that was assigned to the LinkButton control (which the user clicked) as the parameter to the Microsoft.IdentityServer.Web.UI.HomeRealmDiscoveryPage.SelectHomeRealm(System.String) method.

// Remove this.
    protected void PassiveSignInButton_Click( object sender, EventArgs e )
    {
        SelectHomeRealm( PassiveIdentityProvidersDropDownList.SelectedItem.Value );
    }

// Add this.
    protected void Repeater1_ItemCommand(object source, System.Web.UI.WebControls.RepeaterCommandEventArgs e)
    {
        SelectHomeRealm((string)e.CommandArgument);
    }

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