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The application allows you to choose the location from which the document is to be opened. The possible locations are URL, stream, or string. Depending on the choice, you need to enter the URL, filename, or XML string in the text box and click the Open Document button. Clicking the Open Document button opens the document and displays a success message box. The XmlReader class can read an XML document from either a URL or a stream. The stream can by any kind of stream, such as a FileStream or MemoryStream. The XmlReader class cannot read XML strings directly. First, you need to read the string into a MemoryStream and then feed this MemoryStream to the XmlReader class. The code from Listing 3-1 shows these three techniques. Listing 3-1. Loading an XML Document in XmlTextReader private void button1_Click(object sender, EventArgs e) { XmlTextReader reader; if (radioButton1.Checked) { reader = new XmlTextReader(textBox1.Text); } if (radioButton2.Checked) { FileStream stream=File.OpenRead(textBox1.Text); reader = new XmlTextReader(stream); //some processing code stream.Close(); reader.Close(); } if (radioButton3.Checked) { MemoryStream ms=new MemoryStream(); byte[] data=ASCIIEncoding.ASCII.GetBytes(textBox1.Text); ms.Write(data,0,data.Length); reader = new XmlTextReader(ms); //some processing code ms.Close(); reader.Close(); } MessageBox.Show("XML Document Opened Successfully!"); }

The portlet may retrieve information about the version of the portlet API that the portlet container supports. This could be useful for supporting future changes. For instance, if a future version of the portlet API provides a new mechanism for accessing user information, the portlet could support this. If the portlet is running in a portlet container with an older version of the portlet API, it could fall back on some sort of legacy behavior or a compatibility layer. The version data consists of a major version and a minor version. If the version supported is 2.1, the major version is 2, and the minor version is 1. The two methods on PortletContext that return version information are:

This sets up the interface to describe the web service method(s) that the activities will recognize and invoke. Next, you should drag a WebServiceInput activity to the design surface. You ll see an alert on it as it isn t an activating input. The first WebServiceInput in a sequence must be an activating input (see Figure 9-13).

public int getMajorVersion() public int getMinorVersion()

code. The XmlTextReader class resides in the System.Xml namespace, and the MemoryStream class resides in the System.IO namespace.

When future versions of the portlet API are developed, you can decide whether to support the new features and behavior in your portlets. It is very likely that some functionality that is currently only available as a proprietary feature of one vendor s portal will be included in the standard, because portlet developers will benefit.

You ll need to go configure a few properties to make sure that your WebServiceInput activity is properly configured: 1. First, as the error tag indicates, you ll need to make this WebServiceInput activity an activating input. You do this by setting the IsActivating property to true. 2. The error alert will move to the InterfaceType property, indicating that you need to specify the type of interface for this service. Click the ellipsis button (. . .) and you ll get the Browse and Select a .NET Type dialog. Select Current Project and you ll see the interface that you defined earlier as an option (see Figure 9-14). 3. Once you ve selected the CToF interface and clicked OK, you ll see that the error alert moves to MethodName. The method that you specified on the interface was called doCToF, so select that here. 4. You ll now see that a property exists for nC, which is the value (of type double) that the interface declared as being passed into the web service. It has the alert beside it. You need to bind it to a member of your workflow, so click the ellipsis button (. . .), and the binding dialog will appear (Figure 9-15).