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Figure 9-10. The Add Web Reference dialog box A web reference is nothing but a proxy class that allows you to use classes and methods exposed by a web service in your client application. In this dialog box, enter the complete URL of the Service.asmx file and click the Go button. You will see the same help page as before. In the Web Reference Name text box, key in a name for the web reference or leave it unchanged. Whatever you supply in this text box becomes the namespace name for the proxy class being created. Click the Add Reference button. Your Solution Explorer should now look like Figure 9-11.

public Term(String fld, String txt)

} function gameloop() { addToMoves(); playMoves(); getUserMoves(); } function getUserMoves() { currentUserMove =-1; // Do nothing else, just wait for user mouse events } function handleMouseDown(sender, eventArgs) { // The following line of code shows how to find an // element by name and call a method on it. if(inAnim || inMovesPlayBack) { // Do Nothing } else { currentUserMove++; switch(sender.name) { case "rBlue": inAnim = true; currentUserCol=0; slControl.content.findName("LightUpBlue").Begin(); break; case "rGreen": inAnim = true; currentUserCol=1; slControl.content.findName("LightUpGreen").Begin(); break; case "rYellow": inAnim = true; currentUserCol=3; slControl.content.findName("LightUpYellow").Begin(); break;

The text() and field() methods return the text and field passed in as arguments to the constructor:

Note how a new folder called Web References has been added with a subfolder called localhost. The localhost folder further contains a WSDL file. There will also be a file called Reference.cs. This file contains the source code of the web service proxy class. If you change the web service after adding the proxy, you need to update the web reference again. You can do so by right-clicking the web reference and selecting the Update Web Reference option.

case "rRed": inAnim = true; currentUserCol=2; slControl.content.findName("LightUpRed").Begin(); break; } } } // Sample event handler function addToMoves() { currentMove++; theMoves[currentMove] = Math.floor(Math.random()*4); slControl.content.findName("txtRound").Text = "Round " + (currentMove+1); } function playMoves() { currentFrame=-1; inMovesPlayBack = true; doNextFrame(); } function doNextFrame() { currentFrame++; if(currentFrame<=currentMove) { switch(theMoves[currentFrame]) { case 0: slControl.content.findName("LightUpBlue").Begin(); break; case 1: slControl.content.findName("LightUpGreen").Begin(); break; case 2: slControl.content.findName("LightUpRed").Begin(); break; case 3:

public final String text() public final String field()

slControl.content.findName("LightUpYellow").Begin(); break; } } else { inMovesPlayBack = false } } function handleAnimComplete() { if(inMovesPlayBack) { doNextFrame(); } else { if(currentUserCol == theMoves[currentUserMove]) { // We can keep going if(currentUserMove>=currentMove) { gameloop(); } } else { // We hit an error -- game OVER gameOver(); } } inAnim=false; } function setUpEventHandlers() { slControl.content.findName("rBlue").addEventListener("MouseLeftButtonDown", handleMouseDown);

To demonstrate how to call web methods, you will need to create a form that will display the records from the Employees table. The form should look like Figure 9-12.

Many of the Query classes take a Term argument in their constructor, including TermQuery, MultiTermQuery, PrefixQuery, RangeQuery, and WildcardQuery. PhraseQuery and PhrasePrefixQuery have an add() method that takes a Term object. The query classes reside in the org.apache.lucene.search package. Terms are useful if you are constructing a query programmatically, or if you need to modify or remove content from the index.

10

slControl.content.findName("rGreen").addEventListener("MouseLeftButtonDown", handleMouseDown); slControl.content.findName("rYellow").addEventListener("MouseLeftButtonDown", handleMouseDown); slControl.content.findName("rRed").addEventListener("MouseLeftButtonDown", handleMouseDown); slControl.content.findName("LightUpBlue").addEventListener("Completed", handleAnimComplete); slControl.content.findName("LightUpGreen").addEventListener("Completed", handleAnimComplete); slControl.content.findName("LightUpYellow").addEventListener("Completed", handleAnimComplete); slControl.content.findName("LightUpRed").addEventListener("Completed", handleAnimComplete); slControl.content.findName("txtStart").addEventListener("MouseLeftButtonDown", handleStart); }

Figure 9-12. Application that calls the GetEmployees() web method The application consists of a DataGridView control that displays all the records from the Employees table of the Northwind database. Import the localhost namespace in your project (recollect that we have specified the web reference name as localhost). In the Load event of the form, write the code shown in Listing 9-15. Listing 9-15. Calling a Web Method private void Form1_Load(object sender, EventArgs e) { Service proxy = new Service(); DataSet ds = proxy.GetEmployees(); dataGridView1.DataSource = ds.Tables["myemployees"].DefaultView; } The code creates an instance of the proxy class. Note that Service is the proxy class, not the web service class itself. We then call the GetEmployees() method of the proxy, which in turn will call the actual GetEmployees() web method of the web service. Remember that the return value of GetEmployees() is a DataSet populated with records from the Employees table. The code then binds the DataSet to the DataGridView. If you run the application, you should see the DataGridView populated with records from the Employees table.