The IEnumerable interface has only a single member, method GetEnumerator, which returns an enumerator for the object. Figure 20-4 shows class MyClass, which has three items to enumerate, and implements the IEnumerable interface by implementing the GetEnumerator method.
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To accomplish a measurement, you need to send the number of the desired AD channel in the form of a 16-bit value to the AD converter, and you will receive the measured voltage with 12-bit resolution coded in a 16-byte value. The smallest measurable unit is 1/4096 of the supply voltage. To keep it simple, the sample in Listing 5-20 shows how to obtain the voltage from the first AD channel.
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The method MyAssembly encapsulates the external-assembly method call externalMethod within an exception block. When the external assembly throws an exception, it s caught, analyzed, and thrown again. The problem with throwing an exception from the external assembly is that the application will catch something that s unknown. Consider it as follows: you re driving the car, and the carburetor complains that the air mixture contains too little fuel. As a driver, you have no idea what s going on, as you might not even know what a carburetor is. The driver wants a message that processes the problem of the carburetor into something that the driver can understand. You can nest exceptions in .NET to address this problem, as illustrated by the following example: public void MyAssembly() { try { externalAssembly.externalMethod() } catch( Exception ex) { // test the type of exception and generate a new one throw new Exception( "MyAssembly Exception", ex); } } In the rewritten MyAssembly method, a new exception is instantiated within the catch block. When instantiating the Exception type, the constructor has two parameters: "My Assembly Exception" and ex. The first parameter is a buffer that indicates an error message that the application can understand. The second parameter is the external assembly exception. When the new exception is thrown, the old exception is embedded within the new exception. The receiver of the new exception reacts to the exception, and processes the embedded exception if necessary. However, processing the embedded exception is optional, and provides details about the problem. It s a good idea to nest exceptions so that the application can react in a meaningful manner when an exception is generated. Referencing the carburetor example, that would mean generating a low-fuel message. You can define multiple catch statements to indicate multiple exceptions that can be caught. The following example illustrates how to catch multiple exceptions: public void MyAssembly() { try { externalAssembly.externalMethod() } catch( IOException ex) { // Catch an Input Output Exception throw new Exception( "MyAssembly Exception", ex); } catch( Exception ex) { // Catch all of the other exceptions throw new Exception( "MyAssembly Exception", ex); } }
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Lists access types for properties and methods Coordinates the functionality of the authorization subsystem Maintains list of roles for a business object or business object type Defines methods for use by UI components such as Csla. Wpf.Authorizer Defines a delegate signature for the method that resolves whether the current user is in a specific role Maintains the cache of all object type level authorization roles for all business object types Lists options describing what step should be taken when a user attempts an action but does not have access Maintains a list of roles allowed and denied access to a property Maintains a list of roles allowed and denied access to a business object type Maintains the cache of all per-type property authorization roles defined for all business object types
The user can edit the Name column only. The Id column is set to read-only: <asp:BoundField DataField="Id" HeaderText="Id" ReadOnly="True" SortExpression="Id" /> When done, the user can click either the Update or Cancel links on the row. If the user clicks Update, then the UpdateObject event is raised by RolesDataSource to trigger the data update. This event is handled in the page: Protected Sub RolesDataSource_UpdateObject( _ ByVal sender As Object, ByVal e As Csla.Web.UpdateObjectArgs) _ Handles RolesDataSource.UpdateObject Try Dim obj As Roles = GetRoles() Dim role As Role = obj.GetRoleById(CInt(e.Keys.Item("Id"))) role.Name = e.Values.Item("Name").ToString Session("currentObject") = obj.Save e.RowsAffected = 1 Catch ex As Csla.DataPortalException Me.ErrorLabel.Text = ex.BusinessException.Message e.RowsAffected = 0 Catch ex As Exception Me.ErrorLabel.Text = ex.Message e.RowsAffected = 0 End Try End Sub
Figure 13-2. Equivalent enum declarations
4. Draw a circle with an X, as I have done in Figure 16-34.
Follow these steps to clear the old items from any of the pivot table s filter lists, and to prevent old items from being retained in the future: 1. Right-click a cell in the pivot table, and then click PivotTable Options. 2. In the PivotTable Options dialog box, click the Data tab. 3. From the Number of Items to Retain per Field drop-down list, choose None (see Figure 6-11), and then click OK.
As I mentioned earlier, one way to implement a centralized state database is to use the ASP.NET Session object and configure it so that the data is stored in a SQL Server database. If you just want to store arbitrary state data as a single chunk of data in the database, then this is probably the best solution.
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