Listing 13-3 shows the Click event handler of the Show button that groups the data based on the selected field. Listing 13-3. Grouping Data Using LINQ private void button1_Click(object sender, EventArgs e) { txtResults.Clear(); if (comboBox1.SelectedItem.ToString() == "Country") { var result = from employee in employees group employee by employee.Country; foreach (var group in result) { OutputResults("Group :" + group.Key); foreach (Employee emp in group) { OutputResults(emp); } } } ... } The code first decides which field is to be used for the purpose of grouping (we see the code that deals with the country field here). Then it forms a LINQ query expression that groups the items from the List based on that field. Notice the use of C# language extensions to LINQ in the form of the var, from, and group keywords. When you work with LINQ, the return type of
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standard local account, such as one that was configured using the Account System Preference pane and the setup assistant at first boot, has an id starting at 501, incrementing upwards. Open Directory users start at 1025. This makes it possible at first glance to determine the approximate origin of an account. For example, if you saw a unique id in the range of 600 to 1,000 then the account was likely initially created using the accounts system preference pane. If the id command fails with id: jdoe: no such user check the account you are using for testing to see whether it exists and check that your computer is set to correctly try to Search for users in Active Directory. Typically this Search Path is filled in automatically for you by the Directory Utility application at the time of binding. However, if you are manually configuring or attempting to troubleshoot an automated binding you can verify this configuration in Directory Utility. Open the Directory Utility, choose Show Advanced Settings from the windows tool bar, select Search Policy, and verify the /Active Directory/ line item is displayed. Contrary to popular belief, the order listed is not typically relevant for user and group resolution, as you will see the local directory is always accessed first, then typically it should be the next network directory that contains users. If you are having problems that are resolved by moving /Active Directory up in the search order, you may have a configuration problem in your other directory servers or a conflict in the namespace that users occupy. While id is probably the easiest, the best utility for testing your directory services is dscl. The utility provides an interface for programmatically interacting with the DirectoryServices Application Programming Interfaces (APIs). This program can be run via an interactive shell or from within scripts. After first binding to Active Directory, use dscl to test that the directory is available and that user resolution (the ability to resolve user accounts) is working. While you could just logout and log back in depending on any problems encountered, you can more easily see that binding is working from the command line. From a shell prompt, use the dscl command followed by the computer or path to connect to. In order to establish a connection to the currently running DirectoryService daemon, we ll use localhost:
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<!-- Users Form --> <mx:Form width="221" y="5"> <mx:FormItem label="User ID:"> <s:TextInput id="userId" width="85"/> </mx:FormItem> <mx:FormItem label="User Name:"> <s:TextInput id="userName" width="85"/> </mx:FormItem> <mx:FormItem> <s:Button label="Insert User" click="insertDataClickHandler(event)"/> </mx:FormItem> </mx:Form> <!-- Orders Form --> <mx:Form x="239" y="5" width="221"> <mx:FormItem label="User Id"> <mx:ComboBox id="IdComboBox" editable="true" width="85"></mx:ComboBox> </mx:FormItem> <mx:FormItem label="Order Total:"> <s:TextInput id="orderTotal" width="85"/> </mx:FormItem> <mx:FormItem> <s:Button label="Insert Order" click="insertOrderClickHandler(event)"/> </mx:FormItem> </mx:Form> <!-- Results --> <mx:DataGrid id="usersDataGrid" x="16" y="123" height="145"> <mx:columns> <mx:DataGridColumn headerText="User Id" dataField="label"/> <mx:DataGridColumn headerText="User Name" dataField="UserName"/> </mx:columns> </mx:DataGrid>
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A simple client for this class is shown in Listing 15-8. Listing 15-8. This Client Is Using the ContextBoundObject using System; using System.Runtime.Remoting.Contexts; namespace ContextBound { public class TestClient { public static void Main(String[] args) { Organization org = new Organization(); Console.WriteLine("Will set the name"); org.Name = "Happy Hackers"; Console.WriteLine("Will donate"); org.Donate(103); Console.WriteLine("Finished, press <return> to quit."); Console.ReadLine(); } } } When this application is started, you will see the output shown in Figure 15-1.
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Sends data on a network socket asynchronously. Makes an asynchronous web request. See also FtpWebRequest, SoapWebRequest, and HttpWebRequest. Executes an SqlCommand asynchronously. Executes a read of XML asynchronously. Executes a nonreading SqlCommand asynchronously.
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<channel ref="http" > <clientProviders> <formatter ref="binary" /> <provider type="HttpErrorInterceptor.InterceptorSinkProvider, HttpErrorInterceptor" /> </clientProviders> </channel> </channels> <!-- .... details removed .... --> </application> </system.runtime.remoting> </configuration> As soon as you use this configuration file, you will receive correct error messages as shown in Figure 10-5.
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