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The portlet.xml portlet deployment descriptor contains <supports> elements for each markup MIME type that a portlet could handle. The <supports> elements

<object type="application/x-informationcard" name="_xmlToken"> <param name="tokenType" value="urn:oasis:names:tc:SAML:1.0:assertion" /> <param name="requiredClaims" value="http://schemas.xmlsoap.org/ws/2005/05/identity/claims/givenname http://schemas.xmlsoap.org/ws/2005/05/identity/claims/surname http://schemas.xmlsoap.org/ws/2005/05/identity/claims/emailaddress http://schemas.xmlsoap.org/ws/2005/05/identity/claims/privatepersonalidentifier" /> </object>

Recall from 2 and earlier discussion in this chapter that XML namespaces provide a method for uniquely qualifying element and attribute names used in an XML document by associating them with a namespace. When you create XML documents by using XmlTextWriter, you may need to include namespace support for the resultant document. That is what you are going to see in this section. Various methods of XmlTextWriter, such as WriteStartElement(), provide overloads that can be used to specify namespace and prefix information. To see how these overloads can be used, you need to modify the previous application so it looks like the one shown in Figure 3-14.

are children of the <portlet> XML element. Each <supports> element contains one <mime-type> element with the supported MIME type, and any supported portlet modes as <portlet-mode> elements. Because each portlet has to support the VIEW mode, you do not have to include the VIEW mode in the list of supported modes. Here is a snippet of the portlet deployment descriptor for a portlet that supports the HTML and XML markup types with the VIEW, EDIT, and HELP portlet modes:

application/x-informationcard and naming it. There are a number of properties sup-

<portlet> ... <supports> <mime-type>text/html</mime-type> <portlet-mode>edit</portlet-mode> <portlet-mode>help</portlet-mode> </supports> <supports> <mime-type>text/xml</mime-type> <portlet-mode>edit</portlet-mode> <portlet-mode>help</portlet-mode> </supports> ... </portlet>

Figure 3-14. Namespace support in XmlTextWriter As you can see in Figure 3-14, there are text boxes for accepting the namespace URI and prefix from the user. The modified code that adds namespace support is shown in Listing 3-8. Listing 3-8. Namespace Support in XmlTextWriter private void button1_Click(object sender, EventArgs e) { SqlConnection cnn = new SqlConnection(textBox1.Text); SqlCommand cmd = new SqlCommand(); cmd.Connection = cnn; cmd.CommandText = "SELECT * FROM " + textBox2.Text; cnn.Open(); SqlDataReader reader = cmd.ExecuteReader();

ported by this object, including the facility to specify the data that s required by the site. Remember the earlier example in which the last name, first name, and so on were required data from the site it is the requiredClaims property that dictates this. As you can see, it contains a list of the schemas of the required values. When you query its value property, the object invokes the CardSpace client and allows you to specify a card. Should you specify and send a card, the value will become the token associated with that card; otherwise it will be null. The JavaScript code then loads the value of the token into the hidden text field xmltoken. Next, when the user clicks Sign in now! they are in fact invoking a standard HTML form whose action is the SignedIn.aspx page, and one of whose elements is the hidden text field. This causes the token to be submitted to SignedIn.aspx from where it can be parsed.

<portlet> ... <supports> <mime-type>text/html</mime-type> <portlet-mode>edit</portlet-mode> <portlet-mode>print</portlet-mode> </supports> ... </portlet>

XmlTextWriter writer = new XmlTextWriter(textBox3.Text, null); writer.WriteStartDocument(); writer.WriteComment("File exported on " + DateTime.Now); writer.WriteStartElement(textBox5.Text, "table", textBox4.Text); while (reader.Read()) { if (radioButton1.Checked) { writer.WriteStartElement(textBox5.Text, "row", textBox4.Text); for (int i = 0; i < reader.FieldCount; i++) { writer.WriteStartElement(textBox5.Text, reader.GetName(i), textBox4.Text); writer.WriteString(reader.GetValue(i).ToString()); writer.WriteEndElement(); } writer.WriteEndElement(); } else { writer.WriteStartElement(textBox5.Text, "row", textBox4.Text); for (int i = 0; i < reader.FieldCount; i++) { writer.WriteAttributeString(textBox5.Text, reader.GetName(i), textBox4.Text, reader.GetValue(i).ToString()); } writer.WriteEndElement(); } } writer.WriteEndElement(); writer.Close(); reader.Close(); cnn.Close(); }

In the previous example, the portlet uses the print custom portlet mode. If the portal does not support the PRINT mode, the portlet should provide the equivalent functionality in another manner, such as a link in the portlet s main navigation or menu. To support a custom portlet mode, the portlet has to define the custom mode under the <portlet-app> root XML element in the portlet deployment descriptor. The <custom-portlet-mode> element contains

If you don t have this page already, add a new web form to your project and call it SignedIn.aspx. Listing 10-2 shows the code for this page.

4

Notice the lines marked in bold. The WriteStartElement() and WriteAttributeString() methods have an overload that accepts a prefix and namespace URI. If you create XML documents by using these overloads, your document should resemble Figure 3-15.