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msbuild.exe /clp:verbosity=minimal /clp:summary /flp:verbosity=detailed;logfile=build.detailed.log /flp1:errorsonly;logfile=build.errors.log /flp2:warningsonly;logfile=build.warnings.log /m /p: BuildInParallel=true Examples.Tasks.csproj /t:rebuild
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The most significant aspect of the code in Listing 7-2 is the use of the Page_Load method to test for a postback. If this is a postback, meaning that the user has selected an item from the drop-down list, the label displays the name of the color selected, and the label becomes that color. Setting the label color is a little different from setting the label text, as you can see here: Label1.ForeColor = Label1.ForeColor.FromName( _ DropDownList1.SelectedItem.Value) Unlike in earlier versions of Visual Basic, here the ForeColor property isn t a simple number made up of the red, green, and blue values. Instead, ForeColor is a specific type, System.Drawing.Color. You can t, for example, set ForeColor to 255 to get red. A couple of helper functions are available that allow you to set a color using a color name (as in this example) or from a system color, such as ActiveBorder. You can also use one of the predefined colors in the System.Drawing.Color class, which includes everything from SaddleBrown to BlanchedAlmond. Because we ve set the Value attribute of each of the asp:ListItem tags to a color name, we can pass the Value attribute from the selected item to the FromName method and set the ForeColor property to the returned System.Drawing.Color. Figure 7-2 shows the page that appears after you select Green from the drop-down list. (Notice that there is no submit button on this page.)
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Click New to create the contact and open the Completion page shown in Figure 18-15.
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public class MyWebService : WebService { } Indicating the base class for a .NET Framework Web service is not mandatory. A Web service can also be architected starting from the ground up using a new class. Inheriting the behavior of the WebService class has some advantages, however. A Web service based on the System.Web.Services.WebService class has direct access to common ASP.NET objects, including Application, Request, Cache, Session, and Server. These objects are packed into an HttpContext object, which also includes the time when the request was made. If you don't have any need to access the ASP.NET object model, you can do without the WebService class and simply implement the Web service as a class with public methods. With the WebService base class, however, a Web service also has access to the ASP.NET server User object, which can be used to verify the credentials of the current user executing the method. Note The Class attribute is normally set to a class residing in the same file as the @ WebService directive, but nothing prevents you from specifying a class within a separate assembly. In such cases, the entire Web service file consists of a single line of code: <%@ WebService Language="C#" Class="MyWebService,MyAssembly" %> The actual implementation is contained in the specified class, and the assembly that contains the class must be placed in the Bin subdirectory of the virtual folder where the Web service resides. The @ WebService directive supports two additional attributes: Debug and CodeBehind. The former is a Boolean property that indicates whether the Web service should be compiled with debug symbols. The latter specifies the source file that contains the class implementing the Web service when the class is neither located in the same file nor resident in a separate assembly. The WebService Attribute The WebService attribute is optional and does not affect the activity of the Web service class in terms of what is published and executed. The WebService attribute is represented by an instance of the WebServiceAttribute class and enables you to change three default settings for the Web service: the namespace, the name, and the description. The syntax for configuring the WebService attribute is declarative and somewhat selfexplanatory. Within the body of the WebService attribute, you simply insert a commaseparated list of names and values, as shown in the following code. The keyword Description identifies the description of the Web service, whereas Name points to the official name of the Web service. [WebService( Name="Northwind Sales Report Web Service", Description="The Northwind Sales Report Web Service")] public class SalesReportWebService : WebService { 458
Direct users here in the event of an exception . on = Display custom pages . off = Display ASP .NET error pages . Display custom errors to client, display ASP .NET errors locally .
Figure 13-1 shows an ideal dependency graph. The arrows are directional and point in the dependency order: The security of the workstation is dependent on the security of the DC, and the security of the user is dependent on the security of the workstation. The attacker might be able to compromise the workstation, which would compromise any information the user has placed on that workstation, but the compromise would be isolated there. Let us change the picture a little. Suppose the user logging on to the workstation is a member of the local administrators group on the Server. And suppose that a domain administrator frequently logs on to the server. We now have the dependencies shown with bold arrows in Figure 13-2.
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Object-oriented design and development is all about the trade-offs. An object-oriented purist view of the world might argue that the design of a domain model should not be influenced by an implementation detail such as where the state of the objects in that model will be stored when they are not in memory. On the other side of the spectrum, a relational data modeler might argue that the data will very likely outlive the application and that the design of the database schema should concentrate only on efficiently storing and accessing of the data. My view (and that of most of my colleagues) is that such broad statements are one-sided and only lead to problems down the line. In a real-world application, with the sort of timelines we work against nowadays, agility is of the essence. In most enterprise environments you will have control of the object model and at best have influence on the design of the database schema. I find that the process of mapping your objects to databases is easier in places where there is the most cooperation between object modelers and data modelers. Designing the object model and the data model with the involvement of both parties will bring in compromises that will produce applications that
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